2005 Azores subtropical storm
The storm at peak intensity near the Azores on 4 October | |
| Meteorological history | |
|---|---|
| Formed | 4 October 2005 |
| Dissipated | 5 October 2005 |
| Subtropical storm | |
| 1-minute sustained (SSHWS/NWS) | |
| Highest winds | 50 mph (85 km/h) |
| Lowest pressure | 997 mbar (hPa); 29.44 inHg |
| Overall effects | |
| Fatalities | None reported |
| Areas affected | Azores |
| IBTrACS | |
Part of the 2005 Atlantic hurricane season | |
The 2005 Azores subtropical storm was the 19th nameable storm and only subtropical storm of the extremely active 2005 Atlantic hurricane season. It was not named by the National Hurricane Center as it was operationally classified as an extratropical low. It developed in the eastern Atlantic Ocean, an unusual region for late-season tropical cyclogenesis. Nonetheless, the system was able to generate a well-defined centre convecting around a warm core on 4 October. The system was short-lived, crossing over the Azores later on 4 October before becoming extratropical again on 5 October. No damages or fatalities were reported during that time. Its remnants were soon absorbed into a cold front. That system went on to become Hurricane Vince, which affected the Iberian Peninsula.
The subtropical nature of this unnamed system was determined several months after the fact, while the National Hurricane Center was performing its annual review of the season. Upon reclassification, the storm was entered into HURDAT, the official hurricane database.
Meteorological history
The system originated out of an upper-level low just west of the Canary Islands on 28 September. The low organized over the next days, producing bursts of convection. While remaining non-tropical with a cold core it moved gradually west to northwest. On 3 October, it became a broad surface low about 460 mi (740 km) southwest of São Miguel Island in the Azores.[1] Early on 4 October, convection increased as the surface low organized, and the system became a subtropical depression. The subtropical designation was due to a broad wind field, separate from an approaching cold front, while an upper-level trough was over the system.[2] The depression turned northeast into a warm sector ahead of the front and strengthened into a subtropical storm. Late on 4 October, the storm reached a peak intensity of 85 km/h (53 mph) as it moved through the eastern Azores. Afterward, the storm interacted with the approaching cold front, becoming an extratropical cyclone on 5 October before being absorbed by the front.[2] The newly absorbed system would separate from the dissolving frontal system and become Subtropical Storm Vince on 8 October.[3]
The 2005 Azores storm was not classified as a subtropical storm until April 2006, after a reassessment by the National Hurricane Center.[4] Had it been operationally classified as such, it would have been named Tammy.[5]
Impact
Tropical storm-force winds were reported across parts of the Azores, primarily on the eastern islands. The strongest winds were reported on Santa Maria Island, where 10-minute sustained winds reached 79 km/h (49 mph) with gusts to 94 km/h (58 mph).[6] Ponta Delgada reported gusts to 85 km/h (53 mph).[1]
See also
- Timeline of the 2005 Atlantic hurricane season
- List of Azores hurricanes
- List of unnamed tropical cyclones
References
- ^ a b Beven II, John L.; Lixion A. Avila; Eric S. Blake; Daniel P. Brown; James L. Franklin; Richard D. Knabb; Richard J. Pasch; Famie R. Rhome & Stacy R. Stewart (March 2008). "Annual Summary: Atlantic Hurricane Season of 2005" (PDF). Monthly Weather Review. 136 (3): 1131–1141. Bibcode:2008MWRv..136.1109B. doi:10.1175/2007MWR2074.1. Archived from the original (PDF) on 10 September 2008. Retrieved 8 September 2008.
- ^ a b "Tropical Cyclone Report: Unnamed Subtropical Storm" (PDF). National Hurricane Center; National Oceanic and Atmospheric Administration. 10 April 2006. Archived (PDF) from the original on 2 October 2015. Retrieved 31 October 2006.
- ^ "Tropical Cyclone Report: Hurricane Vince" (PDF). National Hurricane Center; National Oceanic and Atmospheric Administration. 22 February 2006. Archived (PDF) from the original on 24 May 2006. Retrieved 4 May 2006.
- ^ "Tropical Weather Summary - 2005 Web Final". National Hurricane Center; Central Pacific Hurricane Center. Archived from the original on 16 October 2020. Retrieved 23 October 2020.
- ^ Masters, Jeff (14 April 2006). "Should-have-been-Tammy | Category 6". Weather Underground. Archived from the original on 26 October 2020. Retrieved 23 October 2020.
- ^ "History for Santa Maria, Azores: Tuesday, October 4, 2005". Weather Underground. 4 October 2005. Archived from the original on 5 October 2017. Retrieved 7 August 2008.
External links
- NHC's Tropical Cyclone Report on the storm