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Wikipedia

Severe thunderstorm warning

February 05, 2023

Not to be confused with Severe thunderstorm watch.

A severe thunderstorm warning (SAME code: SVR) is a severe weather warning product of the National Weather Service that is issued by regional offices of weather forecasting agencies throughout the world to alert the public that severe thunderstorms are imminent or occurring. A severe thunderstorm warning is issued when Doppler weather radar, trained storm spotters or local emergency management personnel indicate that a thunderstorm is producing large hail and high winds capable of causing significant damage, and is expected to continue producing severe weather along the storm's projected track.[1] Flooding is also sometimes caused by torrential rainfall produced by a thunderstorm. (In these cases, a flood advisory or flash flood warning may be issued to alert the public of the flooding threat.)[1]

Severe thunderstorm with a clear slot near main updraft core. Typically a tornado, if present, will form in this area.
Clouds from a dissipating severe thunderstorm.

Definition

A severe thunderstorm warning indicates the warned area is in impending danger from hail or wind speeds meeting warning criteria as well as from lightning and hydrological impacts associated with the storm cell. Severe thunderstorms can and do produce tornadoes without warning.[2] While not all severe thunderstorms produce tornadoes, they can produce serious straight line wind damage as severe as a lower-category tornado or hurricane, and can actually cover a much wider area than that exceeded by a tornado's comparatively relative narrow path width.[3]

If a tornado is detected on radar or is sighted visually, a tornado warning will be issued either in replacement of or concurrently to the existing severe thunderstorm warning.[4] Generally, but not always, a severe thunderstorm watch or tornado watch (or a regional equivalent thereof) will precede a warning. If a tornado warning is issued, based on Doppler weather radar, it means strong rotation has been detected within a thunderstorm. Usually, if a thunderstorm is producing only weak rotation, it will only yield hazardous weather warranting a severe thunderstorm warning. However, the public will usually be advised this type of rotation has been detected and that the storm in question should be watched closely in the near future for further intensification.

Regional basis and criteria

United States

In the United States, the National Weather Service (NWS) defines a severe thunderstorm as having large hail of one inch (2.5 cm) in diameter or larger, surface wind speeds of 58 mph (50 kn; 93 km/h) or greater, and/or a tornado.[5][6] Prior to January 2010, the hail size for which a thunderstorm would be considered severe was 0.75 inches (1.9 cm); public complacency due to overly frequent issuances of severe thunderstorm warnings and recent studies stating hail did not produce significant damage on the ground until it reached one inch in diameter caused the upgrade in hail criteria.[7] Severe thunderstorm warnings are issued by the National Weather Service through the agency's local Weather Forecast Offices, which utilize WarnGen software integrated into the Advance Weather Interactive Processing System (AWIPS) to generate the warning statement; it is then disseminated through various communication routes accessed by the media and various agencies, on the internet, to NOAA satellites, over NOAA Weather Radio and, depending on the storm's severity and at the office's discretion, via activation of the Emergency Alert System to local broadcast media and Wireless Emergency Alerts for cellular phones.

Local NWS forecast offices outline warnings for tornadoes and severe thunderstorms in polygonal shapes for map-based weather hazard products distributed to the main agency, individual forecast office websites and the Storm Prediction Center (including open-source APIs available for free use to public weather websites and mobile apps), based on the storm's projected path as determined by Doppler radar at the time of the warning's issuance. In NWS text products, warnings are usually illustrated by individual counties, parishes or other county-equivalent jurisdictions (sections or the entirety thereof, and in list format if it covers more than one jurisdiction), particularly dependent on the jurisdiction's total land area. Prior to October 2007, warnings were issued by the National Weather Service on a per-county basis.[8] SPC and NWS products as well as severe weather alert displays used by some television stations typically highlight severe thunderstorm warnings with a yellow or orange polygon or filled county/parish/equivalent jurisdiction outline.

The NWS has the option of adding enhanced wording to severe thunderstorm warnings and update statements issued as a Severe Weather Statement (SVS)—"particularly dangerous situation" (PDS), "severe thunderstorm emergency", or, as used by some Central and Southern Region offices as indicative PDS wording, "this is a very dangerous storm"—when an extremely intense severe thunderstorm expected to impact a densely populated area contains very large hailstones and/or intense straight-line winds capable of causing major structural damage (especially to roofs, windows, siding and structures of poor construction such as outbuildings and mobile homes), and severe injury if not death to people and animals exposed outdoors (from either repeated hail-induced blunt trauma or wind-generated debris). Although it is an unofficial alert product, a "severe thunderstorm emergency" statement—an extension of the tornado emergency statements issued to warn of a violent tornado impacting populated areas—is the highest and most urgent level relating to non-tornadic severe thunderstorms. When a threat of tornadic activity exists (especially if a tornado watch is in effect), local NWS forecast offices, particularly those in the Great Plains or Southeastern U.S., will sometimes include a safety precaution action statement indicating "Severe thunderstorms can produce tornadoes with no advance warning..." or similar wording in their severe thunderstorm warnings to advise the public to keep abreast of possible tornado development and any tornado warnings that may be issued.

As part of the agency’s March 2012 implementation of a multi-tier Impact Based Warning (IBW) system to notify the public and emergency management officials of the severity of specific severe weather phenomena, National Weather Service-issued severe thunderstorm warnings and associated Severe Weather Statements providing updated storm information include event tags at the bottom of the product text providing summarical estimates of straight-line wind speeds (sustained or gusts) and hail size and, when applicable, an indication of possible tornadic development. The product text will also provide a summary of impacts to life and property that may be caused the hailstones and winds being produced by the parent thunderstorm. Initially implemented at six NWS offices in Kansas and Missouri, the categorical threat and damage indicator text—which are applicable to all of the agency’s Weather Forecast Offices, primarily those operating within the agency's Central and Southern Region divisions—were expanded to 33 additional Central Region WFOs in March 2013; eight additional offices operating within the Eastern, Southern and Western Region divisions began using the IBW indicators in March 2014. The entire agency began using the format in 2016. The threat indicators consist of three coded taglines, ascending by observational level:[9][10]

  • Tornado – indicates the mesocyclone of the parent severe thunderstorm is producing circulation at or near the cloud base, which may warrant the issuance of a tornado warning if base-level rotation strengthens.[11] When incorporated into the storm impact summary, the tornado tag (appearing in applicable severe thunderstorm warning products as “TORNADO...POSSIBLE”) will precede the wind and hail tags.
  • Hail – indicates the estimated size of hail (measured in inches) being produced by the parent severe thunderstorm (e.g., “HAIL...1.25IN”). When included, the “Impact” section of the warning text will describe potential damage impacts from the hailstones, with the impact message varying in severity depending on radar estimated or observed reports of measured large hail (e.g., “Hail damage to vehicles is expected.”) and the “Hazard” section will provide a comparison of the size of hailstones to objects of similar size (e.g., “baseball size hail” for hailstones measuring 2.75"). (If the tag lists either “HAIL...0.00IN”, indicating no hail is accompanying the storm, or “HAIL...<.75IN”, indicating hailstones below severe criteria that may range in equivalent size from peas [.25"] to pennies [.75"], no hail size will be indicated in the “Hazard” row nor will a description of damage risk will be included in the “Impact” section.)
  • Wind – indicates estimated speed (in miles per hour) of wind gusts produced by the parent thunderstorm (e.g., “WIND...70MPH”). When included, the “Impact” section of the warning text will describe potential damage impacts from the straight-line winds, varying in severity depending on wind strength (e.g., “Expect considerable tree damage. Wind damage is also likely to mobile homes, roofs, and outbuildings.”).

Since July 28, 2021 (or as late as August 2 in certain County Warning Areas), the NWS has incorporated categorical damage threat indicators for higher-end hail and/or wind events at the bottom of text products for severe thunderstorm warnings (including update statements to existing warnings issued as Severe Weather Statements):[12][13]

  • Considerable – to be used when hail of 1.75 inches (4.4 cm) or larger and/or winds at or above 70 miles per hour (110 km/h) is indicated by radar or observed.
  • Destructive – to be used when hail of 2.75 inches (7.0 cm) or larger and/or winds at or above 80 miles per hour (130 km/h) is indicated by radar or observed. (Warnings assigned this indicator incorporate the notation "THIS IS A DESTRUCTIVE STORM FOR[...]"—which superseded the boilerplate "this is a particularly dangerous situation" wording—between the storm summary and hazard information in the product text to indicate certain areas under greatest threat from the criterial wind speeds and/or hail size.)

Similar to the indicators used for tornado warnings since the 2013 implementation of its Impact Based Warning system, the categorical criteria—which will be applicable to all NWS Weather Forecast Offices—was introduced to further explain to the public of the dangers of some thunderstorms, especially those that occur in the Great Plains, that can produce massive hailstones of baseball size (2.75 inches [7.0 cm]) or larger that may fall fast enough to severely injure if not kill a person by repeated blunt trauma, and winds that can cause damage equivalent to hurricanes and tornadoes (especially to roofs and weaker structures such as outbuildings and mobile homes). When deemed necessary, initial warnings and Severe Weather Statement updates containing the "destructive" tag will be disseminated as Wireless Emergency Alerts.[13]

Canada

In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes.[14] Environment and Climate Change Canada issues severe thunderstorm warnings through regional offices of the Meteorological Service of Canada based in Vancouver, Edmonton, Winnipeg, Toronto, Montreal and Dartmouth for specified municipalities and census subdivisions, sometimes including areas adjacent to a particular warned thunderstorm that are not in the immediate approximate path but may experience severe weather from adjacent thunderstorms during the warning timeframe.[14] Warnings are disseminated to the public through broadcast and online media outlets, and Weatheradio Canada; depending on storm severity and regional office discretion, the warning may require activation of the National Public Alerting System (Alert Ready) (French: Système national d'alertes à la population [En Alerte]) and feeding provincial alerting systems (such as Alberta Emergency Alert and SaskAlert) to distribute the alert to local broadcast media and cellular phones.

United Kingdom

In United Kingdom, a severe thunderstorm is defined as having hail in excess of two centimetres (0.79 in) and straight-line winds in excess of 89 km/h (48 kn; 55 mph). The Met Office issues de facto severe thunderstorm warnings through general-purpose weather warning products disseminated by the National Severe Weather Warning Service (classified as yellow, amber or red, depending on storm severity and proximity to the time of expected onset of storm impacts).[15]

Australia

In Australia, a severe thunderstorm is defined as having damaging winds in excess of 90 km/h (49 kn; 56 mph), large hail of two centimetres (0.79 in) or larger, heavy rainfall, and flash flooding. Severe thunderstorm warnings are issued by regional offices of the Bureau of Meteorology (BOM) based in Melbourne Docklands, Adelaide, Darwin, Perth and Brisbane.[16] BOM-issued severe thunderstorm warnings are outlined as either a broad-based warning, covering expected impacts within a weather reporting area, or as a detailed warning, when a thunderstorm is within weather-watch radar range and includes a map depicting any existing thunderstorms and the forecast direction of movement for up to 60 minutes.[16][17]

New Zealand

In New Zealand, a severe thunderstorm is defined by the Meteorological Service of New Zealand (MetService) (Māori: Te Ratonga Tirorangi) as having large hail of 20 millimetres (2.0 cm; 0.79 in), damaging winds of 110 km/h (59 kn; 68 mph), rainfall rates of at least 25 millimetres (0.98 in) per hour and/or tornadoes producing winds above 116 km/h (63 kn; 72 mph) (rated F1 or stronger on the Fujita Scale).[18] MetService issues severe thunderstorm warnings to alert regions expected to experience severe weather phenomena meeting regional criteria and utilize the Common Alerting Protocol (CAP) to generate the warning statement.[19] The warning is then disseminated to the public through terrestrial television and radio stations, online media, mobile app and SMS messaging through Emergency Mobile Alert (EMA); if a tornado has been sighted or indicated by radar within the warned area during the severe thunderstorm warning's duration, civil defense sirens, if present, are usually activated within the region to be affected to inform people who are present outdoors of the approaching tornado threat.[19]

Philippines

In the Philippines, a severe thunderstorm is defined by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) as having strong winds, large hail, torrential rainfall, tornadoes, flash flooding and/or landslides. PAGASA, through its regional services divisions, issue thunderstorm advisories to alert regions and/or provinces expected to experience severe weather phenomena meeting regional criteria within a period of two hours.[20] Warnings are disseminated to the public through terrestrial television and radio outlets,[21] online media, and via SMS messages through the National Disaster Risk Reduction and Management Council's Emergency Cell Broadcast System.[20]

Criteria in various countries

Country Tornado Minimum hail size Minimum wind speed Minimum rainfall rate per hour Source
United States See Tornado Warning 1 inch (25 mm) 58 miles per hour (93 km/h) See Flash Flood Warning [6]
Canada See Tornado Warning 20 millimetres (0.79 in) 90 kilometres per hour (56 mph) 50 millimetres (2.0 in) [14]
Australia All 20 millimetres (0.79 in) 90 kilometres per hour (56 mph) "Conducive to flash flooding" [22]
New Zealand F1 or stronger 20 millimetres (0.79 in) 110 kilometres per hour (68 mph) 25 millimetres (0.98 in) [23]
Germany All 15 millimetres (0.59 in) 105 kilometres per hour (65 mph) 20 millimetres (0.79 in) [24]
Mexico All 5 millimetres (0.20 in) 89 kilometres per hour (55 mph) 20 millimetres (0.79 in) [25][26][27]
United Kingdom All 20 millimetres (0.79 in) 55 miles per hour (89 km/h) "Conducive to flash flooding" [15]

Examples of severe thunderstorm warnings

 
Severe thunderstorm warning Minnesota
An example of a severe thunderstorm warning, this one being issued in Minnesota
Problems playing this file? See media help.

Here is an example of a Severe Thunderstorm Warning issued by the National weather service in San Angelo TX 

Severe Thunderstorm Warning VAC059-153-600-683-685-140130- /O.NEW.KLWX.SV.W.0529.190814T0058Z-190814T0130Z/ Severe Thunderstorm Warning TXC151-253-042245- /O.NEW.KSJT.SV.W.0017.220404T2223Z-220404T2245Zny BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service San Angelo TX 523 PM CDT Mon Apr 4 2022 The National Weather Service in San Angelo has issued a * Severe Thunderstorm Warning for... Western Jones County in west central Texas... East central Fisher County in west central Texas... * Until 545 PM CDT. * At 521 PM CDT, a severe thunderstorm was located near Neinda, moving east at 40 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * This severe thunderstorm will be near... Neinda around 525 PM CDT. Anson around 540 PM CDT. Other locations impacted by this severe thunderstorm include Truby and The Intersection Of Us-180 And Ranch Road 126. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. To report severe weather, contact your nearest law enforcement agency. They will send your report to the National Weather Service office in San Angelo. Large hail and damaging winds and continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature`s leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3261 10025 3276 10031 3294 9990 3263 9981 TIME...MOT...LOC 2221Z 258DEG 33KT 3271 10012 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ TP

This is a Severe Thunderstorm Warning issued for a cluster of severe thunderstorms. 

Severe Thunderstorm Warning ALC003-FLC033-113-130200- /O.NEW.KMOB.SV.W.0225.200713T0114Z-200713T0200Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Mobile AL 814 PM CDT Sun Jul 12 2020 The National Weather Service in Mobile has issued a * Severe Thunderstorm Warning for... Southeastern Baldwin County in southwestern Alabama... West central Santa Rosa County in northwestern Florida... Escambia County in northwestern Florida... * Until 900 PM CDT. * At 813 PM CDT, a cluster of severe thunderstorms was located near Bay Minette, moving southeast at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Ensley, Gonzalez, Bay Minette, Pace, Lillian, Molino and Perdido Beach. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Damaging winds and continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature`s leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3022 8750 3092 8781 3099 8770 3070 8706 TIME...MOT...LOC 0113Z 301DEG 31KT 3084 8779 HAIL...<.75IN WIND...60MPH $$ CGAL

This is a Severe Thunderstorm Warning with a "considerable" tag to denote that 70 mph wind gusts were possible. 

� 664 WUUS53 KLBF 052239 SVRLBF NEC017-031-052300- /O.NEW.KLBF.SV.W.0108.210805T2239Z-210805T2300Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service North Platte NE 539 PM CDT Thu Aug 5 2021 The National Weather Service in North Platte has issued a * Severe Thunderstorm Warning for... East central Cherry County in north central Nebraska... Southwestern Brown County in north central Nebraska... * Until 600 PM CDT. * At 539 PM CDT, a severe thunderstorm was located 12 miles southwest of Johnstown, or 18 miles southwest of Ainsworth, moving southeast at 30 mph. HAZARD...70 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect considerable tree damage. Wind damage is also likely to mobile homes, roofs, and outbuildings. * Locations impacted include... Moon Lake, Willow Lake State Wildlife Management Area and Long Lake State Wildlife Management Area. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4244 10033 4249 10019 4227 9991 4219 10022 TIME...MOT...LOC 2239Z 327DEG 26KT 4242 10018 THUNDERSTORM DAMAGE THREAT...CONSIDERABLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...70 MPH $$ Sporer


This is a Severe Thunderstorm Warning with "destructive" wording to denote that three-inch hail was possible with this storm, with a request for activation the Emergency Alert System. 

� 115 WUUS53 KLBF 052249 SVRLBF NEC089-149-052330- /O.NEW.KLBF.SV.W.0109.210805T2249Z-210805T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED Severe Thunderstorm Warning National Weather Service North Platte NE 549 PM CDT Thu Aug 5 2021 The National Weather Service in North Platte has issued a * Severe Thunderstorm Warning for... Northeastern Rock County in north central Nebraska... Southwestern Holt County in north central Nebraska... * Until 630 PM CDT. * At 548 PM CDT, a severe thunderstorm was located near Newport, or 15 miles east of Bassett, moving southeast at 40 mph. THIS IS A DESTRUCTIVE STORM APPROACHING STUART! HAZARD...Three inch hail and 70 mph wind gusts. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be severely injured. Expect shattered windows, extensive damage to roofs, siding, and vehicles. * Locations impacted include... O'neill, O'Neill, Atkinson, Stuart, Newport and Emmet. This includes the following highways... Highway 20 between mile markers 265 and 308. Highway 281 between mile markers 183 and 189. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Prepare immediately for large hail and damaging winds. People outside should move immediately to shelter inside a strong building. Stay away from windows. This is a dangerous storm. Prepare immediately for large destructive hail capable of producing significant damage. People outside should move to shelter inside a strong building, and stay away from windows. && LAT...LON 4256 9946 4274 9928 4252 9857 4224 9884 TIME...MOT...LOC 2248Z 300DEG 33KT 4262 9924 THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...3.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...70 MPH $$ Sporer

On August 19, 2019 at 1:31 a.m. MDT, the National Weather Service in Cheyenne, Wyoming incorporated the "emergency" wording into a Severe Thunderstorm Warning. In this instance, the "severe thunderstorm emergency" statement was included to denote that three-inch (7.6 cm) diameter hail (as confirmed by storm spotter reports) was imminent in portions of Scotts Bluff, Banner and Sioux Counties in Nebraska, specifically areas around the towns of Scottsbluff and Gering.[28]

� 187 WWUS55 KCYS 160731 SVSCYS Severe Weather Statement National Weather Service Cheyenne WY 131 AM MDT Fri Aug 16 2019 NEC007-157-165-160815- /O.CON.KCYS.SV.W.0342.000000T0000Z-190816T0815Z/ Scotts Bluff NE-Banner NE-Sioux NE- 131 AM MDT Fri Aug 16 2019 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM MDT FOR SCOTTS BLUFF...NORTHEASTERN BANNER AND SOUTHEASTERN SIOUX COUNTIES... ...THIS IS A SEVERE THUNDERSTORM EMERGENCY FOR SCOTTSBLUFF AND GERING!... At 129 AM MDT, a severe thunderstorm was located near Scotts Bluff National Monument, or near Scottsbluff, moving east at 40 mph. 3 INCH DIAMETER HAIL IS IMMINENT! PREPARE NOW FOR DESTRUCTIVE HAIL! This is a very dangerous storm! HAZARD...Three inch hail and 60 mph wind gusts. SOURCE...Trained weather spotters. IMPACT...People and animals outdoors will be severely injured. Expect shattered windows, extensive damage to roofs, siding, and vehicles. Locations impacted include... Scottsbluff, Gering, Mitchell, Terrytown, Minatare, Wildcat Hills State Recreation Area, Lake Minatare Campground, Wildcat Hills Campground, Scotts Bluff National Monument, Hubbard Hill, Scottsbluff Airport, Lake Minatare, Lake Alice, Melbeta and McGrew. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. This is a dangerous storm. Prepare immediately for large destructive hail capable of producing significant damage. People outside should move to a shelter, inside a strong building and away from windows. && LAT...LON 4185 10394 4233 10379 4230 10344 4209 10345 4209 10340 4200 10340 4198 10336 4156 10337 4170 10388 TIME...MOT...LOC 0729Z 288DEG 34KT 4189 10374 HAIL...3.00IN WIND...60MPH $$ Lyons

See also

References

  1. ^ a b . NOAA National Weather Service Glossary. Archived from the original on 2011-06-04. Retrieved 2010-01-10.
  2. ^ Howerton, Paul (2008-06-12). "Severe Thunderstorm Warning". Iowa Environmental Mesonet NWS Product Archive. Retrieved 2010-01-10.
  3. ^ . NOAA National Weather Service Glossary. Archived from the original on 2011-06-04. Retrieved 2010-01-10.
  4. ^ Howerton, Paul (2008-06-12). "Severe Thunderstorm Warning". Iowa Environmental Mesonet NWS Product Archive. Retrieved 2010-01-10.
  5. ^ "Storm Prediction Center Frequently Asked Questions (FAQ)". www.spc.noaa.gov. Retrieved 2018-09-09.
  6. ^ a b "Severe Thunderstorm Definitions". National Weather Service. 17 August 2019.
  7. ^ McClure, Mike (2009-05-26). (PDF). Weather Home Companion. National Weather Service Quad Cities, IA/IL. Archived from the original (PDF) on November 23, 2011. Retrieved 2010-12-15.
  8. ^ NOAA Warning Decision Training Branch (2008-02-26). . Storm-Based Warnings. Archived from the original on 2010-01-24. Retrieved 2010-01-11.
  9. ^ "Impact Based Warnings". National Weather Service. National Oceanic and Atmospheric Administration. 2014. Retrieved March 12, 2014.
  10. ^ "National Weather Service Product Description Document (PDD): National Impact Based Warnings (IBW)" (PDF). National Weather Service Analyze, Forecast, and Support Office. National Oceanic and Atmospheric Administration. April 17, 2020. Retrieved March 7, 2021.
  11. ^ US Department of Commerce, NOAA. "Impact Based Warning Examples". www.weather.gov. Retrieved 2021-07-13.
  12. ^ "National Weather Service Product Description Document: NWS Convective Warnings with the Impact-Based Warning Format" (PDF). National Weather Service Operations and Services. January 26, 2021. Retrieved February 26, 2021.
  13. ^ a b "Service Change Notice 21-22" (PDF). National Weather Service Operations and Services. June 24, 2021. Retrieved July 28, 2021.
  14. ^ a b c Environment Canada. "Severe Thunderstorm Warning". Prairie and Northern Region Weather Watch and Weather Warning Criteria. Archived from the original on 2007-11-19. Retrieved 2010-01-10.
  15. ^ a b . Met Office. Archived from the original on 8 May 2017. Retrieved 6 March 2021.
  16. ^ a b . www.bom.gov.au. Archived from the original on 2017-01-07. Retrieved 2017-01-06.
  17. ^ "National Weather Services - Bureau of Meteorology". www.bom.gov.au. Retrieved 2017-01-06.
  18. ^ "Warnings & Watches". MetService. Retrieved 17 March 2021.
  19. ^ a b "Common Alerting Protocol". MetService. Retrieved 17 March 2021.
  20. ^ a b "Weather Icons". Philippine Atmospheric, Geophysical and Astronomical Services Administration. Retrieved March 17, 2021.
  21. ^ "Thunderstorm advisory". Balitanghali. GMA News and Public Affairs. May 20, 2019. GMA News TV. Archived from the original on 2021-12-12. Retrieved March 17, 2021 – via YouTube.
  22. ^ Bureau of Meteorology (October 2004). "Bureau of Meteorology: Severe Weather Warning Education". Severe Weather Warning Education. Archived from the original on 2012-11-27. Retrieved 2010-02-06.
  23. ^ Meteorological Service of New Zealand Ltd. "Severe Thunderstorm Warnings and other NZ Weather Warnings from MetService.com". Severe Thunderstorm Criteria. Retrieved 2010-02-06.
  24. ^ Deutscher Wetterdienst. "Wetter und Klima - Deutscher Wetterdienst -- Warnungen". Unwetterkriterien (in German). Retrieved 2010-02-06.
  25. ^ Servicio Meteorológico Nacional (2010-01-30). . Servicio Meteorologico Nacional - Mexico - Glosario G (in Spanish). Archived from the original on 2010-12-13. Retrieved 2010-02-06.
  26. ^ Servicio Meteorológico Nacional (2010-02-05). "Escalas empleadas" (in Spanish). Archived from the original on 2013-02-21. Retrieved 2010-02-06.
  27. ^ Servicio Meteorológico Nacional (2010-02-05). "Aviso de Tormentas Intensas y Granizo" (in Spanish). Archived from the original on 2013-02-21. Retrieved 2010-02-06.
  28. ^ Herzmann, Daryl. "IEM :: SVS from NWS CYS". mesonet.agron.iastate.edu. Retrieved 2019-08-26.

External links

  • United States National Weather Service

February 05, 2023
severe, thunderstorm, warning, confused, with, severe, thunderstorm, watch, this, article, contains, many, overly, lengthy, quotations, encyclopedic, entry, please, help, improve, article, presenting, facts, neutrally, worded, summary, with, appropriate, citat. Not to be confused with Severe thunderstorm watch This article contains too many or overly lengthy quotations for an encyclopedic entry Please help improve the article by presenting facts as a neutrally worded summary with appropriate citations Consider transferring direct quotations to Wikiquote or for entire works to Wikisource December 2019 A severe thunderstorm warning SAME code SVR is a severe weather warning product of the National Weather Service that is issued by regional offices of weather forecasting agencies throughout the world to alert the public that severe thunderstorms are imminent or occurring A severe thunderstorm warning is issued when Doppler weather radar trained storm spotters or local emergency management personnel indicate that a thunderstorm is producing large hail and high winds capable of causing significant damage and is expected to continue producing severe weather along the storm s projected track 1 Flooding is also sometimes caused by torrential rainfall produced by a thunderstorm In these cases a flood advisory or flash flood warning may be issued to alert the public of the flooding threat 1 Severe thunderstorm with a clear slot near main updraft core Typically a tornado if present will form in this area Clouds from a dissipating severe thunderstorm Contents 1 Definition 1 1 Regional basis and criteria 1 1 1 United States 1 1 2 Canada 1 1 3 United Kingdom 1 1 4 Australia 1 1 5 New Zealand 1 1 6 Philippines 1 1 7 Criteria in various countries 2 Examples of severe thunderstorm warnings 3 See also 4 References 5 External linksDefinition EditA severe thunderstorm warning indicates the warned area is in impending danger from hail or wind speeds meeting warning criteria as well as from lightning and hydrological impacts associated with the storm cell Severe thunderstorms can and do produce tornadoes without warning 2 While not all severe thunderstorms produce tornadoes they can produce serious straight line wind damage as severe as a lower category tornado or hurricane and can actually cover a much wider area than that exceeded by a tornado s comparatively relative narrow path width 3 If a tornado is detected on radar or is sighted visually a tornado warning will be issued either in replacement of or concurrently to the existing severe thunderstorm warning 4 Generally but not always a severe thunderstorm watch or tornado watch or a regional equivalent thereof will precede a warning If a tornado warning is issued based on Doppler weather radar it means strong rotation has been detected within a thunderstorm Usually if a thunderstorm is producing only weak rotation it will only yield hazardous weather warranting a severe thunderstorm warning However the public will usually be advised this type of rotation has been detected and that the storm in question should be watched closely in the near future for further intensification Regional basis and criteria Edit United States Edit In the United States the National Weather Service NWS defines a severe thunderstorm as having large hail of one inch 2 5 cm in diameter or larger surface wind speeds of 58 mph 50 kn 93 km h or greater and or a tornado 5 6 Prior to January 2010 the hail size for which a thunderstorm would be considered severe was 0 75 inches 1 9 cm public complacency due to overly frequent issuances of severe thunderstorm warnings and recent studies stating hail did not produce significant damage on the ground until it reached one inch in diameter caused the upgrade in hail criteria 7 Severe thunderstorm warnings are issued by the National Weather Service through the agency s local Weather Forecast Offices which utilize WarnGen software integrated into the Advance Weather Interactive Processing System AWIPS to generate the warning statement it is then disseminated through various communication routes accessed by the media and various agencies on the internet to NOAA satellites over NOAA Weather Radio and depending on the storm s severity and at the office s discretion via activation of the Emergency Alert System to local broadcast media and Wireless Emergency Alerts for cellular phones Local NWS forecast offices outline warnings for tornadoes and severe thunderstorms in polygonal shapes for map based weather hazard products distributed to the main agency individual forecast office websites and the Storm Prediction Center including open source APIs available for free use to public weather websites and mobile apps based on the storm s projected path as determined by Doppler radar at the time of the warning s issuance In NWS text products warnings are usually illustrated by individual counties parishes or other county equivalent jurisdictions sections or the entirety thereof and in list format if it covers more than one jurisdiction particularly dependent on the jurisdiction s total land area Prior to October 2007 warnings were issued by the National Weather Service on a per county basis 8 SPC and NWS products as well as severe weather alert displays used by some television stations typically highlight severe thunderstorm warnings with a yellow or orange polygon or filled county parish equivalent jurisdiction outline The NWS has the option of adding enhanced wording to severe thunderstorm warnings and update statements issued as a Severe Weather Statement SVS particularly dangerous situation PDS severe thunderstorm emergency or as used by some Central and Southern Region offices as indicative PDS wording this is a very dangerous storm when an extremely intense severe thunderstorm expected to impact a densely populated area contains very large hailstones and or intense straight line winds capable of causing major structural damage especially to roofs windows siding and structures of poor construction such as outbuildings and mobile homes and severe injury if not death to people and animals exposed outdoors from either repeated hail induced blunt trauma or wind generated debris Although it is an unofficial alert product a severe thunderstorm emergency statement an extension of the tornado emergency statements issued to warn of a violent tornado impacting populated areas is the highest and most urgent level relating to non tornadic severe thunderstorms When a threat of tornadic activity exists especially if a tornado watch is in effect local NWS forecast offices particularly those in the Great Plains or Southeastern U S will sometimes include a safety precaution action statement indicating Severe thunderstorms can produce tornadoes with no advance warning or similar wording in their severe thunderstorm warnings to advise the public to keep abreast of possible tornado development and any tornado warnings that may be issued As part of the agency s March 2012 implementation of a multi tier Impact Based Warning IBW system to notify the public and emergency management officials of the severity of specific severe weather phenomena National Weather Service issued severe thunderstorm warnings and associated Severe Weather Statements providing updated storm information include event tags at the bottom of the product text providing summarical estimates of straight line wind speeds sustained or gusts and hail size and when applicable an indication of possible tornadic development The product text will also provide a summary of impacts to life and property that may be caused the hailstones and winds being produced by the parent thunderstorm Initially implemented at six NWS offices in Kansas and Missouri the categorical threat and damage indicator text which are applicable to all of the agency s Weather Forecast Offices primarily those operating within the agency s Central and Southern Region divisions were expanded to 33 additional Central Region WFOs in March 2013 eight additional offices operating within the Eastern Southern and Western Region divisions began using the IBW indicators in March 2014 The entire agency began using the format in 2016 The threat indicators consist of three coded taglines ascending by observational level 9 10 Tornado indicates the mesocyclone of the parent severe thunderstorm is producing circulation at or near the cloud base which may warrant the issuance of a tornado warning if base level rotation strengthens 11 When incorporated into the storm impact summary the tornado tag appearing in applicable severe thunderstorm warning products as TORNADO POSSIBLE will precede the wind and hail tags Hail indicates the estimated size of hail measured in inches being produced by the parent severe thunderstorm e g HAIL 1 25IN When included the Impact section of the warning text will describe potential damage impacts from the hailstones with the impact message varying in severity depending on radar estimated or observed reports of measured large hail e g Hail damage to vehicles is expected and the Hazard section will provide a comparison of the size of hailstones to objects of similar size e g baseball size hail for hailstones measuring 2 75 If the tag lists either HAIL 0 00IN indicating no hail is accompanying the storm or HAIL lt 75IN indicating hailstones below severe criteria that may range in equivalent size from peas 25 to pennies 75 no hail size will be indicated in the Hazard row nor will a description of damage risk will be included in the Impact section Wind indicates estimated speed in miles per hour of wind gusts produced by the parent thunderstorm e g WIND 70MPH When included the Impact section of the warning text will describe potential damage impacts from the straight line winds varying in severity depending on wind strength e g Expect considerable tree damage Wind damage is also likely to mobile homes roofs and outbuildings Since July 28 2021 or as late as August 2 in certain County Warning Areas the NWS has incorporated categorical damage threat indicators for higher end hail and or wind events at the bottom of text products for severe thunderstorm warnings including update statements to existing warnings issued as Severe Weather Statements 12 13 Considerable to be used when hail of 1 75 inches 4 4 cm or larger and or winds at or above 70 miles per hour 110 km h is indicated by radar or observed Destructive to be used when hail of 2 75 inches 7 0 cm or larger and or winds at or above 80 miles per hour 130 km h is indicated by radar or observed Warnings assigned this indicator incorporate the notation THIS IS A DESTRUCTIVE STORM FOR which superseded the boilerplate this is a particularly dangerous situation wording between the storm summary and hazard information in the product text to indicate certain areas under greatest threat from the criterial wind speeds and or hail size Similar to the indicators used for tornado warnings since the 2013 implementation of its Impact Based Warning system the categorical criteria which will be applicable to all NWS Weather Forecast Offices was introduced to further explain to the public of the dangers of some thunderstorms especially those that occur in the Great Plains that can produce massive hailstones of baseball size 2 75 inches 7 0 cm or larger that may fall fast enough to severely injure if not kill a person by repeated blunt trauma and winds that can cause damage equivalent to hurricanes and tornadoes especially to roofs and weaker structures such as outbuildings and mobile homes When deemed necessary initial warnings and Severe Weather Statement updates containing the destructive tag will be disseminated as Wireless Emergency Alerts 13 Canada Edit In Canada a severe thunderstorm is defined as having wind gusts of greater than 90 km h 56 mph hail with a diameter of greater than two centimetres 0 79 in rainfall rates of greater than 50 millimetres 2 0 in in one hour or greater than 75 millimetres 3 0 in in three hours or tornadoes 14 Environment and Climate Change Canada issues severe thunderstorm warnings through regional offices of the Meteorological Service of Canada based in Vancouver Edmonton Winnipeg Toronto Montreal and Dartmouth for specified municipalities and census subdivisions sometimes including areas adjacent to a particular warned thunderstorm that are not in the immediate approximate path but may experience severe weather from adjacent thunderstorms during the warning timeframe 14 Warnings are disseminated to the public through broadcast and online media outlets and Weatheradio Canada depending on storm severity and regional office discretion the warning may require activation of the National Public Alerting System Alert Ready French Systeme national d alertes a la population En Alerte and feeding provincial alerting systems such as Alberta Emergency Alert and SaskAlert to distribute the alert to local broadcast media and cellular phones United Kingdom Edit In United Kingdom a severe thunderstorm is defined as having hail in excess of two centimetres 0 79 in and straight line winds in excess of 89 km h 48 kn 55 mph The Met Office issues de facto severe thunderstorm warnings through general purpose weather warning products disseminated by the National Severe Weather Warning Service classified as yellow amber or red depending on storm severity and proximity to the time of expected onset of storm impacts 15 Australia Edit In Australia a severe thunderstorm is defined as having damaging winds in excess of 90 km h 49 kn 56 mph large hail of two centimetres 0 79 in or larger heavy rainfall and flash flooding Severe thunderstorm warnings are issued by regional offices of the Bureau of Meteorology BOM based in Melbourne Docklands Adelaide Darwin Perth and Brisbane 16 BOM issued severe thunderstorm warnings are outlined as either a broad based warning covering expected impacts within a weather reporting area or as a detailed warning when a thunderstorm is within weather watch radar range and includes a map depicting any existing thunderstorms and the forecast direction of movement for up to 60 minutes 16 17 New Zealand Edit In New Zealand a severe thunderstorm is defined by the Meteorological Service of New Zealand MetService Maori Te Ratonga Tirorangi as having large hail of 20 millimetres 2 0 cm 0 79 in damaging winds of 110 km h 59 kn 68 mph rainfall rates of at least 25 millimetres 0 98 in per hour and or tornadoes producing winds above 116 km h 63 kn 72 mph rated F1 or stronger on the Fujita Scale 18 MetService issues severe thunderstorm warnings to alert regions expected to experience severe weather phenomena meeting regional criteria and utilize the Common Alerting Protocol CAP to generate the warning statement 19 The warning is then disseminated to the public through terrestrial television and radio stations online media mobile app and SMS messaging through Emergency Mobile Alert EMA if a tornado has been sighted or indicated by radar within the warned area during the severe thunderstorm warning s duration civil defense sirens if present are usually activated within the region to be affected to inform people who are present outdoors of the approaching tornado threat 19 Philippines Edit In the Philippines a severe thunderstorm is defined by the Philippine Atmospheric Geophysical and Astronomical Services Administration PAGASA as having strong winds large hail torrential rainfall tornadoes flash flooding and or landslides PAGASA through its regional services divisions issue thunderstorm advisories to alert regions and or provinces expected to experience severe weather phenomena meeting regional criteria within a period of two hours 20 Warnings are disseminated to the public through terrestrial television and radio outlets 21 online media and via SMS messages through the National Disaster Risk Reduction and Management Council s Emergency Cell Broadcast System 20 Criteria in various countries Edit Country Tornado Minimum hail size Minimum wind speed Minimum rainfall rate per hour SourceUnited States See Tornado Warning 1 inch 25 mm 58 miles per hour 93 km h See Flash Flood Warning 6 Canada See Tornado Warning 20 millimetres 0 79 in 90 kilometres per hour 56 mph 50 millimetres 2 0 in 14 Australia All 20 millimetres 0 79 in 90 kilometres per hour 56 mph Conducive to flash flooding 22 New Zealand F1 or stronger 20 millimetres 0 79 in 110 kilometres per hour 68 mph 25 millimetres 0 98 in 23 Germany All 15 millimetres 0 59 in 105 kilometres per hour 65 mph 20 millimetres 0 79 in 24 Mexico All 5 millimetres 0 20 in 89 kilometres per hour 55 mph 20 millimetres 0 79 in 25 26 27 United Kingdom All 20 millimetres 0 79 in 55 miles per hour 89 km h Conducive to flash flooding 15 Examples of severe thunderstorm warnings Edit Severe thunderstorm warning Minnesota source source track An example of a severe thunderstorm warning this one being issued in Minnesota Problems playing this file See media help Here is an example of a Severe Thunderstorm Warning issued by the National weather service in San Angelo TX Severe Thunderstorm Warning VAC059 153 600 683 685 140130 O NEW KLWX SV W 0529 190814T0058Z 190814T0130Z Severe Thunderstorm Warning TXC151 253 042245 O NEW KSJT SV W 0017 220404T2223Z 220404T2245Zny BULLETIN IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service San Angelo TX 523 PM CDT Mon Apr 4 2022 The National Weather Service in San Angelo has issued a Severe Thunderstorm Warning for Western Jones County in west central Texas East central Fisher County in west central Texas Until 545 PM CDT At 521 PM CDT a severe thunderstorm was located near Neinda moving east at 40 mph HAZARD 60 mph wind gusts and quarter size hail SOURCE Radar indicated IMPACT Hail damage to vehicles is expected Expect wind damage to roofs siding and trees This severe thunderstorm will be near Neinda around 525 PM CDT Anson around 540 PM CDT Other locations impacted by this severe thunderstorm include Truby and The Intersection Of Us 180 And Ranch Road 126 PRECAUTIONARY PREPAREDNESS ACTIONS For your protection move to an interior room on the lowest floor of a building To report severe weather contact your nearest law enforcement agency They will send your report to the National Weather Service office in San Angelo Large hail and damaging winds and continuous cloud to ground lightning is occurring with this storm Move indoors immediately Lightning is one of nature s leading killers Remember if you can hear thunder you are close enough to be struck by lightning Torrential rainfall is occurring with this storm and may lead to flash flooding Do not drive your vehicle through flooded roadways amp amp LAT LON 3261 10025 3276 10031 3294 9990 3263 9981 TIME MOT LOC 2221Z 258DEG 33KT 3271 10012 HAIL THREAT RADAR INDICATED MAX HAIL SIZE 1 00 IN WIND THREAT RADAR INDICATED MAX WIND GUST 60 MPH TP This is a Severe Thunderstorm Warning issued for a cluster of severe thunderstorms Severe Thunderstorm Warning ALC003 FLC033 113 130200 O NEW KMOB SV W 0225 200713T0114Z 200713T0200Z BULLETIN IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Mobile AL 814 PM CDT Sun Jul 12 2020 The National Weather Service in Mobile has issued a Severe Thunderstorm Warning for Southeastern Baldwin County in southwestern Alabama West central Santa Rosa County in northwestern Florida Escambia County in northwestern Florida Until 900 PM CDT At 813 PM CDT a cluster of severe thunderstorms was located near Bay Minette moving southeast at 35 mph HAZARD 60 mph wind gusts SOURCE Radar indicated IMPACT Expect damage to roofs siding and trees Locations impacted include Ensley Gonzalez Bay Minette Pace Lillian Molino and Perdido Beach PRECAUTIONARY PREPAREDNESS ACTIONS For your protection move to an interior room on the lowest floor of a building Damaging winds and continuous cloud to ground lightning is occurring with this storm Move indoors immediately Lightning is one of nature s leading killers Remember if you can hear thunder you are close enough to be struck by lightning Torrential rainfall is occurring with this storm and may lead to flash flooding Do not drive your vehicle through flooded roadways amp amp LAT LON 3022 8750 3092 8781 3099 8770 3070 8706 TIME MOT LOC 0113Z 301DEG 31KT 3084 8779 HAIL lt 75IN WIND 60MPH CGAL This is a Severe Thunderstorm Warning with a considerable tag to denote that 70 mph wind gusts were possible 664 WUUS53 KLBF 052239 SVRLBF NEC017 031 052300 O NEW KLBF SV W 0108 210805T2239Z 210805T2300Z BULLETIN IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service North Platte NE 539 PM CDT Thu Aug 5 2021 The National Weather Service in North Platte has issued a Severe Thunderstorm Warning for East central Cherry County in north central Nebraska Southwestern Brown County in north central Nebraska Until 600 PM CDT At 539 PM CDT a severe thunderstorm was located 12 miles southwest of Johnstown or 18 miles southwest of Ainsworth moving southeast at 30 mph HAZARD 70 mph wind gusts and quarter size hail SOURCE Radar indicated IMPACT Hail damage to vehicles is expected Expect considerable tree damage Wind damage is also likely to mobile homes roofs and outbuildings Locations impacted include Moon Lake Willow Lake State Wildlife Management Area and Long Lake State Wildlife Management Area PRECAUTIONARY PREPAREDNESS ACTIONS For your protection move to an interior room on the lowest floor of a building amp amp LAT LON 4244 10033 4249 10019 4227 9991 4219 10022 TIME MOT LOC 2239Z 327DEG 26KT 4242 10018 THUNDERSTORM DAMAGE THREAT CONSIDERABLE HAIL THREAT RADAR INDICATED MAX HAIL SIZE 1 00 IN WIND THREAT RADAR INDICATED MAX WIND GUST 70 MPH Sporer This is a Severe Thunderstorm Warning with destructive wording to denote that three inch hail was possible with this storm with a request for activation the Emergency Alert System 115 WUUS53 KLBF 052249 SVRLBF NEC089 149 052330 O NEW KLBF SV W 0109 210805T2249Z 210805T2330Z BULLETIN EAS ACTIVATION REQUESTED Severe Thunderstorm Warning National Weather Service North Platte NE 549 PM CDT Thu Aug 5 2021 The National Weather Service in North Platte has issued a Severe Thunderstorm Warning for Northeastern Rock County in north central Nebraska Southwestern Holt County in north central Nebraska Until 630 PM CDT At 548 PM CDT a severe thunderstorm was located near Newport or 15 miles east of Bassett moving southeast at 40 mph THIS IS A DESTRUCTIVE STORM APPROACHING STUART HAZARD Three inch hail and 70 mph wind gusts SOURCE Radar indicated IMPACT People and animals outdoors will be severely injured Expect shattered windows extensive damage to roofs siding and vehicles Locations impacted include O neill O Neill Atkinson Stuart Newport and Emmet This includes the following highways Highway 20 between mile markers 265 and 308 Highway 281 between mile markers 183 and 189 PRECAUTIONARY PREPAREDNESS ACTIONS For your protection move to an interior room on the lowest floor of a building Prepare immediately for large hail and damaging winds People outside should move immediately to shelter inside a strong building Stay away from windows This is a dangerous storm Prepare immediately for large destructive hail capable of producing significant damage People outside should move to shelter inside a strong building and stay away from windows amp amp LAT LON 4256 9946 4274 9928 4252 9857 4224 9884 TIME MOT LOC 2248Z 300DEG 33KT 4262 9924 THUNDERSTORM DAMAGE THREAT DESTRUCTIVE HAIL THREAT RADAR INDICATED MAX HAIL SIZE 3 00 IN WIND THREAT RADAR INDICATED MAX WIND GUST 70 MPH Sporer On August 19 2019 at 1 31 a m MDT the National Weather Service in Cheyenne Wyoming incorporated the emergency wording into a Severe Thunderstorm Warning In this instance the severe thunderstorm emergency statement was included to denote that three inch 7 6 cm diameter hail as confirmed by storm spotter reports was imminent in portions of Scotts Bluff Banner and Sioux Counties in Nebraska specifically areas around the towns of Scottsbluff and Gering 28 187 WWUS55 KCYS 160731 SVSCYS Severe Weather Statement National Weather Service Cheyenne WY 131 AM MDT Fri Aug 16 2019 NEC007 157 165 160815 O CON KCYS SV W 0342 000000T0000Z 190816T0815Z Scotts Bluff NE Banner NE Sioux NE 131 AM MDT Fri Aug 16 2019 A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM MDT FOR SCOTTS BLUFF NORTHEASTERN BANNER AND SOUTHEASTERN SIOUX COUNTIES THIS IS A SEVERE THUNDERSTORM EMERGENCY FOR SCOTTSBLUFF AND GERING At 129 AM MDT a severe thunderstorm was located near Scotts Bluff National Monument or near Scottsbluff moving east at 40 mph 3 INCH DIAMETER HAIL IS IMMINENT PREPARE NOW FOR DESTRUCTIVE HAIL This is a very dangerous storm HAZARD Three inch hail and 60 mph wind gusts SOURCE Trained weather spotters IMPACT People and animals outdoors will be severely injured Expect shattered windows extensive damage to roofs siding and vehicles Locations impacted include Scottsbluff Gering Mitchell Terrytown Minatare Wildcat Hills State Recreation Area Lake Minatare Campground Wildcat Hills Campground Scotts Bluff National Monument Hubbard Hill Scottsbluff Airport Lake Minatare Lake Alice Melbeta and McGrew PRECAUTIONARY PREPAREDNESS ACTIONS For your protection move to an interior room on the lowest floor of a building This is a dangerous storm Prepare immediately for large destructive hail capable of producing significant damage People outside should move to a shelter inside a strong building and away from windows amp amp LAT LON 4185 10394 4233 10379 4230 10344 4209 10345 4209 10340 4200 10340 4198 10336 4156 10337 4170 10388 TIME MOT LOC 0729Z 288DEG 34KT 4189 10374 HAIL 3 00IN WIND 60MPH LyonsSee also EditConvective storm detection Severe thunderstorm watch Severe weather Severe weather terminology United States SKYWARN SupercellReferences Edit a b Severe Thunderstorm Warning NOAA National Weather Service Glossary Archived from the original on 2011 06 04 Retrieved 2010 01 10 Howerton Paul 2008 06 12 Severe Thunderstorm Warning Iowa Environmental Mesonet NWS Product Archive Retrieved 2010 01 10 Severe Thunderstorm NOAA National Weather Service Glossary Archived from the original on 2011 06 04 Retrieved 2010 01 10 Howerton Paul 2008 06 12 Severe Thunderstorm Warning Iowa Environmental Mesonet NWS Product Archive Retrieved 2010 01 10 Storm Prediction Center Frequently Asked Questions FAQ www spc noaa gov Retrieved 2018 09 09 a b Severe Thunderstorm Definitions National Weather Service 17 August 2019 McClure Mike 2009 05 26 New One Inch Hail Criteria for Severe Thunderstorm Warnings PDF Weather Home Companion National Weather Service Quad Cities IA IL Archived from the original PDF on November 23 2011 Retrieved 2010 12 15 NOAA Warning Decision Training Branch 2008 02 26 Why Storm Based Warnings Storm Based Warnings Archived from the original on 2010 01 24 Retrieved 2010 01 11 Impact Based Warnings National Weather Service National Oceanic and Atmospheric Administration 2014 Retrieved March 12 2014 National Weather Service Product Description Document PDD National Impact Based Warnings IBW PDF National Weather Service Analyze Forecast and Support Office National Oceanic and Atmospheric Administration April 17 2020 Retrieved March 7 2021 US Department of Commerce NOAA Impact Based Warning Examples www weather gov Retrieved 2021 07 13 National Weather Service Product Description Document NWS Convective Warnings with the Impact Based Warning Format PDF National Weather Service Operations and Services January 26 2021 Retrieved February 26 2021 a b Service Change Notice 21 22 PDF National Weather Service Operations and Services June 24 2021 Retrieved July 28 2021 a b c Environment Canada Severe Thunderstorm Warning Prairie and Northern Region Weather Watch and Weather Warning Criteria Archived from the original on 2007 11 19 Retrieved 2010 01 10 a b Met Office Warning Colours Met Office Archived from the original on 8 May 2017 Retrieved 6 March 2021 a b Australian weather and warnings information www bom gov au Archived from the original on 2017 01 07 Retrieved 2017 01 06 National Weather Services Bureau of Meteorology www bom gov au Retrieved 2017 01 06 Warnings amp Watches MetService Retrieved 17 March 2021 a b Common Alerting Protocol MetService Retrieved 17 March 2021 a b Weather Icons Philippine Atmospheric Geophysical and Astronomical Services Administration Retrieved March 17 2021 Thunderstorm advisory Balitanghali GMA News and Public Affairs May 20 2019 GMA News TV Archived from the original on 2021 12 12 Retrieved March 17 2021 via YouTube Bureau of Meteorology October 2004 Bureau of Meteorology Severe Weather Warning Education Severe Weather Warning Education Archived from the original on 2012 11 27 Retrieved 2010 02 06 Meteorological Service of New Zealand Ltd Severe Thunderstorm Warnings and other NZ Weather Warnings from MetService com Severe Thunderstorm Criteria Retrieved 2010 02 06 Deutscher Wetterdienst Wetter und Klima Deutscher Wetterdienst Warnungen Unwetterkriterien in German Retrieved 2010 02 06 Servicio Meteorologico Nacional 2010 01 30 Granizo Servicio Meteorologico Nacional Mexico Glosario G in Spanish Archived from the original on 2010 12 13 Retrieved 2010 02 06 Servicio Meteorologico Nacional 2010 02 05 Escalas empleadas in Spanish Archived from the original on 2013 02 21 Retrieved 2010 02 06 Servicio Meteorologico Nacional 2010 02 05 Aviso de Tormentas Intensas y Granizo in Spanish Archived from the original on 2013 02 21 Retrieved 2010 02 06 Herzmann Daryl IEM SVS from NWS CYS mesonet agron iastate edu Retrieved 2019 08 26 External links EditBureau of Meteorology Severe Thunderstorm Warnings Meteorological Service of Canada United States National Weather Service Retrieved from https en wikipedia org w index php title Severe thunderstorm warning amp oldid 1132382007, wikipedia, wiki, book, books, library,

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