The 1969–70 South Pacific cyclone season was a very inactive season, featuring only seven disturbances, five tropical cyclones, and two severe tropical cyclones. The season featured only one landfalling storm, Cyclone Dawn. Dawn formed very late, on February 10, and the last storm, Tropical Depression Isa, dissipated early, on April 19. On January 2, a tropical low developed onto a weak depression on the Coral Sea. It later crossed into the Australian Region, where it strengthened onto Severe Tropical Cyclone Ada.
Dawn formed on February 16 on the Gulf of Carpentaria as a tropical low. It strengthened to a Category 2 tropical cyclone (Australian scale) before dissipating, northwest of Brisbane on the South Pacific basin.
Severe Tropical Cyclone DollyEdit
Category 3 severe tropical cyclone (Australian scale)
Dolly formed to the east of Luganville on February 11, and was last noted on February 25 to the north of French Polynesia. It peaked as a Category 1 tropical cyclone (SSHWS) or Category 3 severe tropical cyclone (Australian scale).
Severe Tropical Cyclone EmmaEdit
Category 3 severe tropical cyclone (Australian scale)
Severe Tropical Cyclone Emma originated as a depression to the west of Wallis and Futuna. It moved to the south-southeast before it was last noted on March 6 to the north of French Polynesia.
A disturbance developed to a depression, to the south-southwest of Fiji. It continued its L movement while strengthening to a tropical cyclone before weakening due to the cold waters and wind shear. Gillian was last noted, far south of Marshall Islands as it dissipated. It was strengthened to a equivalent of a tropical storm on the SSHWS scale.
A tropical low developed to a depression, south of Tuvalu. It traveled to the west, strengthening as Tropical Cyclone Helen before weakening. It was last noted on April 17, south-southwest of Fiji.
On April 17, 1970, Apollo 13 was making its final descent over the splashdown zone when they spotted a weakening Helen as they were re-entering the earth's atmosphere. Mission control had been tracking the storm to make sure it did not interfere with the mission's re-entry.
It was unknown if the precursor to Isa was noted to the southeast, or to the southwest of Solomon Islands. It strengthened to a Category 1 tropical cyclone (Australian scale), but it remained a tropical depression (SSHWS). It was last noted on April 19, as it dissipated.
Other systemsEdit
During January 5, the Australian Bureau of Meteorology first noted the existence of a weak tropical depression over the eastern Coral Sea, however, it has since been determined that the depression developed during January 2 near 15°48′S165°06′E / 15.8°S 165.1°E / -15.8; 165.1.[1][2] The system was subsequently tracked by infrequent satelitte imagery, which revealed that it slowly completed a cyclonic loop near the Solomon Islands before curving back toward the southwest.[1] The system entered the Australian region during 15 January, where it subsequently became Severe Tropical Cyclone Ada before making landfall on Queensland during 17 January.[1]
^ abcGibbs, W. J. (June 1970). "Report by Director of Meteorology on Cyclone 'Ada'" (PDF). Bureau of Meteorology. Retrieved 22 April 2017.
^"Australian Tropical Cyclone Database" (CSV). Australian Bureau of Meteorology. 2023-06-30. Retrieved 2023-06-30. A guide on how to read the database is available here.
^Smith, Ray (1990). (PDF). Weather and Climate. The Meteorological Society of New Zealand. 10 (1): 25. doi:10.2307/44279572. JSTOR 44279572. S2CID 201717866. Archived from the original (PDF) on November 29, 2014. Retrieved March 28, 2014.
^"1970 Tropical Cyclone Emma (1970058S15200)". International Best Track Archive for Climate Stewardship. Retrieved October 21, 2019.
1969, south, pacific, cyclone, season, very, inactive, season, featuring, only, seven, disturbances, five, tropical, cyclones, severe, tropical, cyclones, season, featured, only, landfalling, storm, cyclone, dawn, dawn, formed, very, late, february, last, stor. The 1969 70 South Pacific cyclone season was a very inactive season featuring only seven disturbances five tropical cyclones and two severe tropical cyclones The season featured only one landfalling storm Cyclone Dawn Dawn formed very late on February 10 and the last storm Tropical Depression Isa dissipated early on April 19 On January 2 a tropical low developed onto a weak depression on the Coral Sea It later crossed into the Australian Region where it strengthened onto Severe Tropical Cyclone Ada 1969 70 South Pacific cyclone seasonSeason summary mapSeasonal boundariesFirst system formedFebruary 10 1970Last system dissipatedApril 19 1970Strongest stormNameDolly amp Emma Maximum winds130 km h 80 mph 10 minute sustained Lowest pressure965 hPa mbar Seasonal statisticsTotal disturbances7Tropical cyclones5Severe tropical cyclones2Total fatalities6Total damage 5 million 1970 USD Related articles1969 70 South West Indian Ocean cyclone season 1969 70 Australian region cyclone seasonSouth Pacific tropical cyclone seasons1950s 1960s 1969 70 1970 71 1971 72 Contents 1 Seasonal summary 2 Systems 2 1 Tropical Cyclone Dawn 2 2 Severe Tropical Cyclone Dolly 2 3 Severe Tropical Cyclone Emma 2 4 Tropical Cyclone Gillian 2 5 Tropical Cyclone Helen 2 6 Tropical Cyclone Isa 2 7 Other systems 3 Seasonal effects 4 References 5 External linksSeasonal summary EditSystems EditTropical Cyclone Dawn Edit Category 2 tropical cyclone Australian scale nbsp DurationFebruary 16 February 19Peak intensity100 km h 65 mph 10 min 980 hPa mbar Dawn formed on February 16 on the Gulf of Carpentaria as a tropical low It strengthened to a Category 2 tropical cyclone Australian scale before dissipating northwest of Brisbane on the South Pacific basin Severe Tropical Cyclone Dolly Edit Category 3 severe tropical cyclone Australian scale Category 1 tropical cyclone SSHWS nbsp DurationFebruary 11 February 25Peak intensity130 km h 80 mph 10 min 965 hPa mbar Dolly formed to the east of Luganville on February 11 and was last noted on February 25 to the north of French Polynesia It peaked as a Category 1 tropical cyclone SSHWS or Category 3 severe tropical cyclone Australian scale Severe Tropical Cyclone Emma Edit Category 3 severe tropical cyclone Australian scale Category 1 tropical cyclone SSHWS nbsp DurationFebruary 27 March 6Peak intensity130 km h 80 mph 10 min 965 hPa mbar Severe Tropical Cyclone Emma originated as a depression to the west of Wallis and Futuna It moved to the south southeast before it was last noted on March 6 to the north of French Polynesia Tropical Cyclone Gillian Edit Category 1 tropical cyclone Australian scale Tropical storm SSHWS nbsp DurationApril 7 April 11Peak intensity85 km h 55 mph 10 min 980 hPa mbar A disturbance developed to a depression to the south southwest of Fiji It continued its L movement while strengthening to a tropical cyclone before weakening due to the cold waters and wind shear Gillian was last noted far south of Marshall Islands as it dissipated It was strengthened to a equivalent of a tropical storm on the SSHWS scale Tropical Cyclone Helen Edit Category 1 tropical cyclone Australian scale Tropical storm SSHWS nbsp DurationApril 13 April 17Peak intensity75 km h 45 mph 10 min 990 hPa mbar A tropical low developed to a depression south of Tuvalu It traveled to the west strengthening as Tropical Cyclone Helen before weakening It was last noted on April 17 south southwest of Fiji On April 17 1970 Apollo 13 was making its final descent over the splashdown zone when they spotted a weakening Helen as they were re entering the earth s atmosphere Mission control had been tracking the storm to make sure it did not interfere with the mission s re entry Tropical Cyclone Isa Edit Not to be confused with Subtropical Depression Issa Category 1 tropical cyclone Australian scale Tropical depression SSHWS nbsp DurationApril 14 entered basin April 19Peak intensity75 km h 45 mph 10 min 990 hPa mbar It was unknown if the precursor to Isa was noted to the southeast or to the southwest of Solomon Islands It strengthened to a Category 1 tropical cyclone Australian scale but it remained a tropical depression SSHWS It was last noted on April 19 as it dissipated Other systems Edit During January 5 the Australian Bureau of Meteorology first noted the existence of a weak tropical depression over the eastern Coral Sea however it has since been determined that the depression developed during January 2 near 15 48 S 165 06 E 15 8 S 165 1 E 15 8 165 1 1 2 The system was subsequently tracked by infrequent satelitte imagery which revealed that it slowly completed a cyclonic loop near the Solomon Islands before curving back toward the southwest 1 The system entered the Australian region during 15 January where it subsequently became Severe Tropical Cyclone Ada before making landfall on Queensland during 17 January 1 Seasonal effects Edit1969 70 South Pacific cyclone season Name Dates active Peak intensity Areas affected Damage US Deaths RefsCategory Wind speed PressureAda January 2 15 Tropical depression 55 km h 35 mph 997 hPa 29 44 inHg Solomon Islands Vanuatu Unknown UnknownAlice January 4 Unknown strength storm Unknown Unknown Unknown Unknown 3 Dawn February 10 19 Category 2 tropical cyclone 100 km h 65 mph 980 hPa 28 94 inHg Unknown UnknownDolly February 11 25 Category 3 severe tropical cyclone 130 km h 80 mph 965 hPa 28 50 inHg Unknown UnknownEmma March 2 4 Category 3 severe tropical cyclone 130 km h 80 mph 965 hPa 28 50 inHg Unknown Unknown 4 Gillian April 7 11 Category 1 tropical cyclone 75 km h 45 mph 990 hPa 29 23 inHg Unknown UnknownHelen April 13 17 Category 1 tropical cyclone 75 km h 45 mph 990 hPa 29 23 inHg Unknown UnknownIsa April 14 19 Category 1 tropical cyclone 75 km h 45 mph 990 hPa 29 23 inHg Unknown UnknownSeason aggregates8 systems January 2 April 19 1970 130 km h 80 mph 965 hPa 28 50 inHg References Edit a b c Gibbs W J June 1970 Report by Director of Meteorology on Cyclone Ada PDF Bureau of Meteorology Retrieved 22 April 2017 Australian Tropical Cyclone Database CSV Australian Bureau of Meteorology 2023 06 30 Retrieved 2023 06 30 A guide on how to read the database is available here Smith Ray 1990 What s in a Name PDF Weather and Climate The Meteorological Society of New Zealand 10 1 25 doi 10 2307 44279572 JSTOR 44279572 S2CID 201717866 Archived from the original PDF on November 29 2014 Retrieved March 28 2014 1970 Tropical Cyclone Emma 1970058S15200 International Best Track Archive for Climate Stewardship Retrieved October 21 2019 External links EditAtlantic hurricane seasons 1969 1970 Eastern Pacific hurricane seasons 1969 1970 Western Pacific typhoon seasons 1969 1970 North Indian Ocean cyclone seasons 1969 1970 World Meteorological Organization Australian Bureau of Meteorology Fiji Meteorological Service New Zealand MetService Joint Typhoon Warning Center Retrieved from https en wikipedia org w index php title 1969 70 South Pacific cyclone season amp oldid 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