Talk:2020 Atlantic hurricane season/Link Archiver/5

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Tropical Storm Beta[edit]

Tropical Storm Beta
Current storm status
Tropical storm (1-min mean)
Satellite image
Forecast map
As of:4:00 p.m. CDT (18:00 UTC) September 20
Location:27°42′N 94°00′W / 27.7°N 94.0°W / 27.7; -94.0 (Tropical Storm Beta) ± 20 nm
About 120 mi (195 km) SSE of Galveston, Texas
About 155 mi (250 km) ESE of Port O'Connor, Texas
Sustained winds:50 kn (60 mph; 95 km/h) (1-min mean)
gusting to 60 kn (70 mph; 110 km/h)
Pressure:996 mbar (29.41 inHg)
Movement:WNW at 5 kn (6 mph; 9 km/h)
See more detailed information.

On September 10, the NHC began to monitor a trough of low pressure that had formed over the northeastern Gulf of Mexico.[1] Development of the system was not expected at the time due to strong upper-level winds produced by Hurricane Sally.[2] The disturbance nonetheless persisted, moving southwestward into the southwestern Gulf of Mexico where it began to organize as Sally moved away into the Southeastern United States early on September 16.[3] The next day, hurricane hunters found a closed circulation, and as thunderstorms persisted near the center, the NHC initiated advisories on Tropical Depression Twenty-Two at 23:00 UTC on September 17.[4] At 21:00 UTC on September 18, the system strengthened into Tropical Storm Beta,[5] becoming the earliest 23rd named Atlantic storm and beating Tropical Storm Alpha of 2005 by 34 days. Although affected by wind shear and dry air, the storm continued to intensify, reaching a peak intensity of 60 mph (95 km/h) and a pressure of 994 mb (29.36 inHg) at 15:00 UTC on September 19.[6] However, it became nearly stationary after turning westward over the Gulf of Mexico.[7] This caused upwelling and the continued negative effects of dry air and wind shear caused the storm to become disorganized.[8]

Current storm information[edit]

As of 4:00 p.m. CDT (21:00 UTC) September 20, Tropical Storm Beta is located within 20 nautical miles of 27°42′N 94°00′W / 27.7°N 94.0°W / 27.7; -94.0 (Beta), about 120 mi (195 km) south-southeast of Galveston, Texas, and about 155 mi (250 km) east-southeast of Port O'Connor, Texas. Maximum sustained winds are 50 knots (60 mph; 95 km/h), with gusts up to 60 knots (70 mph; 110 km/h). The minimum barometric pressure is 996 mbar (29.41 inHg), and the system is moving west-northwest at 5 knots (6 mph; 9 km/h). Tropical-storm-force winds extend outward up to 195 miles (315 km) from the center.

For the latest official information, see:

Watches and warnings[edit]

Tropical Storm Warning
Tropical storm conditions expected within 36 hours.
Tropical Storm Watch
Tropical storm conditions possible within 48 hours.
Storm Surge Warning
Life-threatening inundation from storm surge possible within 36 hours.
Source: [9]

Tropical Storm Wilfred[edit]

Tropical Depression Wilfred
Current storm status
Tropical depression (1-min mean)
Satellite image
Forecast map
As of:5:00 p.m. AST (21:00 UTC) September 20
Location:15°54′N 45°48′W / 15.9°N 45.8°W / 15.9; -45.8 (Tropical Depression Wilfred) ± 45 nm
About 1,445 mi (2,330 km) W of the Cabo Verde Islands
About 1,030 mi (1,660 km) E of the Lesser Antilles
Sustained winds:30 kn (35 mph; 55 km/h) (1-min mean)
gusting to 40 kn (45 mph; 75 km/h)
Pressure:1008 mbar (29.77 inHg)
Movement:WNW at 17 kn (20 mph; 31 km/h)
See more detailed information.

On September 13, the NHC began to monitor a tropical wave over Africa for possible development.[10] It subsequently emerged over the eastern Atlantic and began to slowly organize as it moved westward, although it continually failed to obtain a well-defined low-level circulation (LLC).[11] However, at 15:00 UTC on September 18, an LLC was found and, as it already had gale force winds, the system was designated as Tropical Storm Wilfred.[12] Wilfred is the earliest 21st named storm on record, beating out Hurricane Vince of 2005 by 20 days,[13] and is only the second "W" named storm in the Atlantic (joining 2005's Hurricane Wilma) since naming began in 1950.[14] Due to wind shear and unfavourable conditions caused by Hurricane Teddy, Wilfred failed to strengthen and at 15:00 UTC on September 20, Wilfred weakened to a tropical depression.[15]

Current storm information[edit]

As of 5:00 a.m. AST (21:00 UTC) September 20, Tropical Depression Wilfred is located within 45 nautical miles of 15°54′N 45°48′W / 15.9°N 45.8°W / 15.9; -45.8 (Wilfred), about 1,445 mi (2,330 km) west of the Cabo Verde Islands, and about 1,030 mi (1,660 km) east of the Lesser Antilles. Maximum sustained winds are 30 knots (35 mph; 55 km/h), with gusts up to 40 knots (45 mph; 75 km/h). The minimum barometric pressure is 1008 mbar (29.77 inHg), and the system is moving west-northwest at 17 knots (20 mph; 31 km/h).

For the latest official information, see:

Subtropical Storm Alpha[edit]

Subtropical storm (SSHWS)
 
DurationSeptember 18 – September 19
Peak intensity50 mph (85 km/h) (1-min);
996 mbar (hPa)
Main article: Subtropical Storm Alpha (2020)

At 06:00 UTC on September 15, the NHC, together with Météo France, began tracking a non-tropical low pressure area north of 48°N, several hundred miles north of the Azores.[16] It was given a low chance of development as it moved southeast.[17] Over the next few days, it organized while the extratropical system surrounding it gradually weakened, although its proximity and fast movement towards the coast caused the NHC to lower its chances to development.[11] Early on September 18, the system started to rapidly become better defined and the NHC designated it as Subtropical Storm Alpha at 16:30 UTC,[18] a rare, although not unprecedented, occurrence of a tropical or subtropical cyclone within an extratropical cyclone.[19] The famous 1991 Perfect Storm was cited as an example of such an occurrence.[20] Alpha made landfall just north of Lisbon, Portugal, at 18:30 UTC, becoming the first recorded tropical or subtropical cyclone to make landfall in mainland Portugal. [21] After landfall, the storm rapidly weakened, becoming a remnant low over the district of Viseu in Portugal at 03:00 UTC on September 19.[22]

Alpha is the earliest 22nd named storm, beating Wilma of 2005 by 29 days, and marked the second time in recorded history (joining 2005) that the main naming list has been exhausted and Greek letters were used. Additionally, Alpha overtook Tropical Storm Christine of 1973 as the easternmost-forming tropical or subtropical cyclone on record in the Atlantic. Alpha was the third confirmed tropical or subtropical cyclone to make landfall in mainland Europe, following a hurricane in Spain in 1842 and Hurricane Vince (as a tropical depression) in 2005.

In preparation for Alpha on September 18, orange warnings were raised for high wind and heavy rain in Coimbra District and Leiria District of Portugal.[23] Alpha and its associated low produced extensive wind damage, spawned at least two tornadoes, and caused extreme street flooding.[24][25] In Spain, the front associated with Alpha caused a train to derail in Madrid, although no one was seriously injured, while lightning storms in Ons Island caused a forest fire. A woman died in Calzadilla after a roof fell on top of her.[25]

  1. ^ Robbie Berg (September 10, 2020). "Five-Day Graphical Tropical Weather Outlook". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Archived from the original on September 16, 2020. Retrieved September 17, 2020.
  2. ^ Dan Brown (September 14, 2020). "Five-Day Graphical Tropical Weather Outlook". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 17, 2020.
  3. ^ Eric Blake (September 16, 2020). "Five-Day Graphical Tropical Weather Outlook". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 17, 2020.
  4. ^ Robbie Berg (September 17, 2020). "Tropical Depression Twenty-Two Special Advisory Number 1". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 17, 2020.
  5. ^ Jack Beven (September 18, 2020). "Tropical Storm Beta Public Advisory Number 5". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 18, 2020.
  6. ^ Jack Beven (September 19, 2020). "Tropical Storm Beta Public Advisory Number 8". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 20, 2020.
  7. ^ Jack Beven (September 19, 2020). "Tropical Storm Beta Public Advisory Number 9". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 20, 2020.
  8. ^ Jack Beven (September 19, 2020). "Tropical Storm Discussion Number 9". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 20, 2020.
  9. ^ "Tropical Storm Beta Advisory Number 11". National Hurricane Center. Retrieved 20 September 2020.
  10. ^ Stacy Stewart (September 13, 2020). "Five-Day Graphical Tropical Weather Outlook". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 18, 2020.
  11. ^ a b David Zelinsky (September 18, 2020). "Two-Day Graphical Tropical Weather Outlook". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 18, 2020.
  12. ^ Eric Blake (September 18, 2020). "Tropical Storm Wilfred Public Advisory Number 1". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 18, 2020.
  13. ^ Fox 13 News (September 18, 2020). "Tropical Storm Wilfred forms in Atlantic, using final name on NHC's 2020 list". Tampa, Florida: WTVT. Retrieved September 18, 2020.{{cite news}}: CS1 maint: numeric names: authors list (link)
  14. ^ Hausen, Nick (September 18, 2020). "Tropical Storm Wilfred forms in the Atlantic". Harrisburg, Illinois: WSIL-TV. Retrieved September 18, 2020.
  15. ^ Christopher Landsea (September 20, 2020). "Tropical Depression Wilfred Discussion Number 9". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 20, 2020.
  16. ^ http://bmcnoldy.rsmas.miami.edu/tropics/atcf/latestATL.png
  17. ^ Eric Blake (September 15, 2020). "Five-Day Graphical Tropical Weather Outlook". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 18, 2020.
  18. ^ Eric Blake (September 18, 2020). "Subtropical Storm Alpha Public Advisory Number 1". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 18, 2020.
  19. ^ "Informação especial Assunto: Ciclone subtropical Alpha". web.archive.org. Instituto Português do Mar e da Atmosfera. 18 September 2020. Retrieved 18 September 2020.
  20. ^ Richard Pasch and Lixion Avila (March 26, 1992). "Atlantic Hurricane Season of 1991" (PDF). National Oceanic and Atmospheric Administration. Archived (PDF) from the original on November 26, 2013. Retrieved March 28, 2010.
  21. ^ Eric Blake (September 18, 2020). "Subtropical Storm Alpha Discussion Number 2". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 18, 2020.
  22. ^ Dave Roberts (September 19, 2020). "Post-Tropical Cyclone Alpha Public Advisory Number 3". nhc.noaa.gov. Miami, Florida: National Hurricane Center. Retrieved September 19, 2020.
  23. ^ "Ciclone Alpha: Aviso laranja por agravamento de mau tempo hoje no distrito de Coimbra | Notícias de Coimbra". noticiasdecoimbra.pt. Retrieved 18 September 2020.
  24. ^ "Tornados em Beja e Palmela ocorreram devido a supercélulas. Fim de semana chega com a tempestade subtropical Alpha". Observador.{{cite web}}: CS1 maint: url-status (link)
  25. ^ a b "Los estragos del temporal: Una mujer muere en Cáceres al caer un tejado y un tren descarrila en Madrid". telecinco (in European Spanish). 18 September 2020. Retrieved 18 September 2020.
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