Landspout is a term created by atmospheric scientist Howard B. Bluestein in 1985 for a tornado not associated with a mesocyclone.[3] The Glossary of Meteorology defines a landspout:
A landspout tornado forms from a developing thunderstorm near Cheyenne Wells, Colorado. Landspouts are exceptionally common in Eastern Colorado.[1][2]A landspout near North Platte, Nebraska, on May 22, 2004. Note the characteristic smooth, tubular shape, similar to that of a fair-weather waterspout.Landspout on September 29, 2007
"Colloquial expression describing tornadoes occurring with a parent cloud in its growth stage and with its vorticity originating in the boundary layer.
The parent cloud does not contain a preexisting mid-level mesocyclone. The landspout was so named because it looks like "a weak Florida Keyswaterspout over land."[4]
Landspouts are typically weaker than mesocyclone-associated tornadoes spawned within supercell thunderstorms, in which the strongest tornadoes form.
Characteristicsedit
Landspouts are a type of tornado that forms during the growth stage of a cumulus congestus or occasionally a cumulonimbus cloud when an updraft stretches boundary layer vorticity upward into a vertical axis and tightens it into a strong vortex. Landspouts can also occur due to interactions from outflow boundaries, as they can occasionally cause enhanced convergence and vorticity at the surface. These generally are smaller and weaker than supercell tornadoes and do not form from a mesocyclone or pre-existing rotation in the cloud. Because of this lower depth, smaller size, and weaker intensity, landspouts are rarely detected by Doppler weather radar (NWS).[5]
Landspouts share a strong resemblance and development process to that of waterspouts, usually taking the form of a translucent and highly laminar helical tube. "They are typically narrow, rope-like condensation funnels that form while the thunderstorm cloud is still growing and there is no rotating updraft", according to the National Weather Service.[2] Landspouts are considered tornadoes since a rapidly rotating column of air is in contact with both the surface and a cumuliform cloud. Not all landspouts are visible, and many are first sighted as debris swirling at the surface before eventually filling in with condensation and dust.
Orography can influence landspout (and even mesocyclone tornado) formation. A notable example is the propensity for landspout occurrence in the Denver Convergence Vorticity Zone (DCVZ).
Life cycleedit
Forming in relation to misocyclones and under updrafts, a landspout generally lasts for less than 15 minutes; however, they can persist substantially longer, and produce significant damage. Landspouts tend to progress through recognizable stages of formation, maturation, and dissipation, and usually decay when a downdraft or significant precipitation (outflow) occur nearby. They may form in lines or groups of multiple landspouts.[6]
Damageedit
Landspouts are commonly weak; however, on rare occasions, a landspout can be as strong as an EF2 or EF3 tornado.
^Judson Jones (21 May 2020). "Why Landspout Tornadoes are Common in Colorado". The Denver Post.
^ abJudson Jones (8 June 2021). "The No. 1 US county for producing tornadoes just spawned another landspout". CNN.
^Bluestein, Howard B. (1985). "A History of Severe-Storm-Intercept Field Programs". Weather and Forecasting. 14 (4): 267–270. Bibcode:1999WtFor..14..558B. doi:10.1175/1520-0434(1999)014<0558:AHOSSI>2.0.CO;2. ISSN 1520-0434.
^American Meteorological Society (2000). . ametsoc.org. Archived from the original on 6 April 2007. Retrieved 27 March 2007.
^Forbes; Wakimoto (1983). "A Concentrated Outbreak of Tornadoes, Downbursts and Microbursts, and Implications Regarding Vortex Classification". Monthly Weather Review. 111 (1): 220–235. Bibcode:1983MWRv..111..220F. doi:10.1175/1520-0493(1983)111<0220:ACOOTD>2.0.CO;2.
External linksedit
Media related to Landspouts at Wikimedia Commons
Online Tornado FAQ
January 01, 1970
landspout, term, created, atmospheric, scientist, howard, bluestein, 1985, tornado, associated, with, mesocyclone, glossary, meteorology, defines, landspout, landspout, tornado, forms, from, developing, thunderstorm, near, cheyenne, wells, colorado, exceptiona. Landspout is a term created by atmospheric scientist Howard B Bluestein in 1985 for a tornado not associated with a mesocyclone 3 The Glossary of Meteorology defines a landspout A landspout tornado forms from a developing thunderstorm near Cheyenne Wells Colorado Landspouts are exceptionally common in Eastern Colorado 1 2 A landspout near North Platte Nebraska on May 22 2004 Note the characteristic smooth tubular shape similar to that of a fair weather waterspout Landspout on September 29 2007 Colloquial expression describing tornadoes occurring with a parent cloud in its growth stage and with its vorticity originating in the boundary layer The parent cloud does not contain a preexisting mid level mesocyclone The landspout was so named because it looks like a weak Florida Keys waterspout over land 4 Landspouts are typically weaker than mesocyclone associated tornadoes spawned within supercell thunderstorms in which the strongest tornadoes form Characteristics editLandspouts are a type of tornado that forms during the growth stage of a cumulus congestus or occasionally a cumulonimbus cloud when an updraft stretches boundary layer vorticity upward into a vertical axis and tightens it into a strong vortex Landspouts can also occur due to interactions from outflow boundaries as they can occasionally cause enhanced convergence and vorticity at the surface These generally are smaller and weaker than supercell tornadoes and do not form from a mesocyclone or pre existing rotation in the cloud Because of this lower depth smaller size and weaker intensity landspouts are rarely detected by Doppler weather radar NWS 5 Landspouts share a strong resemblance and development process to that of waterspouts usually taking the form of a translucent and highly laminar helical tube They are typically narrow rope like condensation funnels that form while the thunderstorm cloud is still growing and there is no rotating updraft according to the National Weather Service 2 Landspouts are considered tornadoes since a rapidly rotating column of air is in contact with both the surface and a cumuliform cloud Not all landspouts are visible and many are first sighted as debris swirling at the surface before eventually filling in with condensation and dust Orography can influence landspout and even mesocyclone tornado formation A notable example is the propensity for landspout occurrence in the Denver Convergence Vorticity Zone DCVZ Life cycle editForming in relation to misocyclones and under updrafts a landspout generally lasts for less than 15 minutes however they can persist substantially longer and produce significant damage Landspouts tend to progress through recognizable stages of formation maturation and dissipation and usually decay when a downdraft or significant precipitation outflow occur nearby They may form in lines or groups of multiple landspouts 6 Damage editLandspouts are commonly weak however on rare occasions a landspout can be as strong as an EF2 or EF3 tornado See also editDust devil Fire whirl Funnel cloud Tornadogenesis Vortex engine Waterspout WhirlwindReferences edit Judson Jones 21 May 2020 Why Landspout Tornadoes are Common in Colorado The Denver Post a b Judson Jones 8 June 2021 The No 1 US county for producing tornadoes just spawned another landspout CNN Bluestein Howard B 1985 A History of Severe Storm Intercept Field Programs Weather and Forecasting 14 4 267 270 Bibcode 1999WtFor 14 558B doi 10 1175 1520 0434 1999 014 lt 0558 AHOSSI gt 2 0 CO 2 ISSN 1520 0434 American Meteorological Society 2000 Glossary of Meteorology Second Edition ametsoc org Archived from the original on 6 April 2007 Retrieved 27 March 2007 Wakimoto Wilson 1989 Non supercell Tornadoes Monthly Weather Review 117 6 1113 1140 Bibcode 1989MWRv 117 1113W doi 10 1175 1520 0493 1989 117 lt 1113 NST gt 2 0 CO 2 Forbes Wakimoto 1983 A Concentrated Outbreak of Tornadoes Downbursts and Microbursts and Implications Regarding Vortex Classification Monthly Weather Review 111 1 220 235 Bibcode 1983MWRv 111 220F doi 10 1175 1520 0493 1983 111 lt 0220 ACOOTD gt 2 0 CO 2 External links edit nbsp Media related to Landspouts at Wikimedia Commons Advanced Spotters Field Guide Online Tornado FAQ Retrieved from https en wikipedia org w index php title Landspout amp oldid 1222779005, wikipedia, wiki, book, books, library,
