Subtropical storm Andrea

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Subtropical storm Andrea
Subtropical Storm ( SSHWS )
Andrea shortly before the naming
Andrea shortly before the naming
Emergence May 9, 2007
resolution May 11, 2007
Peak wind
speed
60  mph (95  km / h ) (sustained for 1 minute)
Lowest air pressure 1001  mbar ( hPa ; 29.6  inHg )
dead 6 indirect
Property damage Unknown
Affected
areas 		Virginia , North Carolina , South Carolina , Georgia , Florida , Bahamas
Season overview:
2007 Atlantic hurricane season

Subtropical Storm Andrea was a subtropical cyclone and the first named storm of the 2007 Atlantic hurricane season . It developed on May 9th from an originally nontropical depression, about 150 miles northeast of Daytona Beach , Florida , three weeks before the official start of the hurricane season. After the storm hit dry air and increased vertical wind shear , it weakened to a subtropical low pressure area on May 10 and became almost stationary. On the morning of May 11th, the National Hurricane Center stopped issuing weather warnings about Andrea. The storm caused heavy swell along the coast from Florida to North Carolina , as well as coastal erosion and some property damage. Six people drowned as a result of the storm.

Andrea was the first storm to form since Tropical Storm Ana in April 2003 prior to the start of the official hurricane season, and also the first named storm in May since Arlene in 1981 .

Storm course

Path of the storm

At the beginning of May, a high pressure trough reached south into the western Atlantic Ocean and led a cold front to the south on its rear side. For a few days the forecast models assumed that the channel was developing into an enclosed low pressure area , and on May 6, about 140 km east of Cape Hatteras, one with a large and well-developed circulation developed . The low maintained sufficient convection and, in conjunction with the strong high pressure area in its north, a compact pressure gradient caused squalls near the coast. The extra-tropical storm took a course to the southeast and later turned to the southwest and the air pressure fell steadily. On May 7th, Andrea reached gusts of hurricane strength. In the absence of tropical moisture, the associated convection was minimal and dissipated.

The National Hurricane Center first considered the possibility of tropical cyclogenesis on May 8 , when Andrea was 370 km east-southeast of the coast of South Carolina . The convection had steadily increased as the system moved westward at 8-16 km / h. It changed little during the day, although the following morning hurricane experts found that the low began to take on the characteristics of a sub-tropical storm as it moved over warmer water. Early on May 9, a reconnaissance flight into the system revealed sustained wind speeds of 70 km / h per hour and a flat thermal core. This indicated that the system was neither a tropical cyclone nor an extra-tropical cyclone . In addition, the analysis of the satellite images showed a consolidation of the convection near the center as well as signs of an outflow in the height and a contraction of the radius of the maximum wind strength from previously more than 185 km to only about 120 km. Based on these observations and the hybrid structure of the system, the National Hurricane Center classified the depression as Subtropical Storm Andrea on May 9 at 15:00 UTC . At the time, the system was centered about 150 miles northeast of Daytona Beach , Florida . Based on an analysis of the storm that was carried out, the weather researchers suspected that the storm had turned into a subtropical cyclone nine hours earlier. Andrea became the first system since Tropical Storm Ana in April 2003, which developed before the official start of the Atlantic hurricane season. At the same time, Andrea was the first named storm in May since Tropical Storm Arlene in 1981.

From the moment Andrea became a subtropical cyclone, the storm was embedded in a large, almost stationary low pressure trough, causing it to move in a westerly direction. When Andrea came across an area where the surface temperature of seawater did not exceed 25  ° C , the organizational structure of the system dispersed and convection decreased significantly. In the early morning of May 10, most of the Andrea-associated weather was east of the cyclone, within a ribbon structure of slight convection from a brief period of westerly vertical wind shear . In addition, the construction of the circulation center had suffered because several smaller cloud eddies had formed within the large circulation. This and increasing wind shear in connection with dry air, which suppressed the convection, caused a weakening of the storm a little later that morning. At around 15:00 UTC on May 10, there were only a few thunderstorms left near the center, so the NHC downgraded Andrea to a subtropical low pressure area. Although some less permanent thunderstorms persisted in the eastern semicircle, the system was poorly organized and weak. Because of the lack of substantial deep convection for eighteen hours, the National Hurricane Center stopped issuing weather warnings on the morning of May 11 when the system was about 125 km northeast of Cape Canaveral , Florida. A little later that same day, when the system moved south-southeast, convection started again over the center. However, it lacked a strong enough organization to qualify as a tropical cyclone. By May 12, most of the shower activity had shifted to the east side of the system, and the National Hurricane Center determined that a small increase in convection would create a tropical depression. Andrea accelerated in an east-northeast direction, away from the mainland of the United States, without evolving, and after the system got over colder water, the remnants of Andrea merged with an oncoming cold front on May 14th .

Preparations

Due to the high surf of the previous low, the responsible office of the National Weather Service had issued a warning for most of the coast between Florida and North Carolina. From the upgrade to a subtropical storm, the National Hurricane Center announced an advance warning of a tropical storm for the area from the mouth of the Altamaha River in Georgia south to Flagler Beach in Florida. This warning was revoked when Andrea weakened to a subtropical depression. A gust warning had been issued for the South Carolina coast .

In the Isle of Palms , South Carolina, volunteers and firefighters filled sandbags to prepare for a high tide after the surf caused by the storm previously caused light beach erosion. As a precautionary measure, those responsible cut off the electricity and gas supplies to several uninhabited buildings. Schools in Dare County , North Carolina, were closed because of the threat of high winds. The North Carolina Department of Transportation also suspended ferry services to and from Ocracoke Island and Knotts Island .

Effects

Subtropical storm Andrea shortly after being classified as a storm.

Before Andrea became a sub-tropical cyclone, the low pressure area caused squalls and dangerous waves along the coasts between North Carolina and Georgia, which later also affected the Florida coast. Significant waves have also been observed in the Bahamas . The waves caused beach erosion and washed up against coastal settlements along the American east coast.

Off the coast of North Carolina, the storm caused waves of up to 10 m and strong winds that damaged three boats, so that their crew had to be rescued by the Coast Guard . Another boat and the four people on its crew were reported missing and the coast guard's search was canceled after twelve days without any result. Two kayakers drowned near Seabrook Island . One of them was found the next day and the body of the other a week later.

On the shore, the wind reached 84 km / h in Norfolk , with an unconfirmed 92 km / h near Virginia Beach . Similar observations were made along the Outer Banks , where the wind knocked down some trees and cut power lines; some limited blackouts were associated with it. In Elizabeth City , North Carolina, the edge of a rain belt brought 10 mm of precipitation and lightning strikes in two hours; one of them injured two firefighters. The winds damaged rooftops and covered sections of North Carolina Highway 12 with sand. The road had to be closed for a day because the storm had washed away about 60 m of the road. In some places the storm eroded up to six meters from the shore, putting 70 houses in immediate danger. On St. Simons Island , Georgia, the storm caused a storm surge 2.43 m above normal. The recorded rains affected the southeast corner of the state.

In Florida, the three-meter high surf near Lantana capsized a boat; the two people on board were rescued unharmed. The waves also washed away a sailboat that had previously been thrown onto the shore in Juno Beach . High waves flooded a parking lot and shattered fences and tree hedges in Jupiter ; A maintenance shed nearby was destroyed. Eight leatherback turtle nests in Boca Raton were destroyed when the surf hit the dunes. Because of the high waves, the beach pier in Flagler Beach had to be closed for one day. Low to moderate coastal erosion caused the Florida Department of Transportation to replenish areas along the coastal wall with sand. A surfer drowned in the high surf off the coast of New Smyrna Beach in Volusia County . The outer band structure caused light rainfall, the maximum of which occurred with around 20 mm in the area of ​​responsibility of the National Weather Service in Jacksonville . The gusts reached the strength of a tropical storm in the northeast of the state. The winds spread smoke from local forest fires across the Tampa Bay area to Miami , fueling the severe bush fires in northern Florida and southern Georgia.

See also

 Wikinews: Subtropical storm brews off eastern Florida, USA (English)  - Message

Web links

Commons : Subtropical Storm Andrea  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b National Hurricane Center: Atlantic hurricane best track (Hurdat) ( English ) Hurricane Research Division. Atlantic Oceanographic and Meteorological Laboratory. National Oceanic and Atmospheric Administrations Office of Oceanic & Atmospheric Research. April 2018. Retrieved May 9, 2018.
  2. ^ Cangialosi: May 4 Tropical Weather Discussion . National Hurricane Center . 2007. Retrieved May 9, 2007.
  3. ↑ a b Cangialosi: May 6 Tropical Weather Discussion . National Hurricane Center. 2007. Retrieved May 9, 2007.
  4. ↑ a b c Jamie R. Rhome, Jack Beven and Mark Willis: Subtropical Storm Andrea Tropical Cyclone Report (PDF; 339 kB) National Hurricane Center. 2007. Retrieved July 2, 2007.
  5. ^ Cangialosi: May 7 Tropical Weather Discussion . National Hurricane Center. 2007. Retrieved May 9, 2007.
  6. ↑ a b Knabb: May 8 Special Tropical Disturbance Statement . National Hurricane Center. 2007. Retrieved May 9, 2007.
  7. ↑ a b Brown: May 9 Special Tropical Disturbance Statement . National Hurricane Center. 2007. Accessed on May 9, 2007.  ( Page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.@1@ 2Template: dead link / ftp.met.fsu.edu  
  8. ↑ Franklin / Knabb: May 9 Special Tropical Disturbance Statement (2) . National Hurricane Center. 2007. Retrieved May 9, 2007.
  9. ↑ a b Knabb: Subtropical Storm Andrea Discussion One . National Hurricane Center. 2007. Retrieved May 9, 2007.
  10. ^ Knabb: Subtropical Storm Andrea Discussion Two . National Hurricane Center. 2007. Retrieved May 9, 2007.
  11. ^ Avila: Subtropical Storm Andrea Discussion Three . National Hurricane Center. 2007. Retrieved May 9, 2007.
  12. ↑ Mainelli: Subtropical Storm Andrea Discussion Four . National Hurricane Center. 2007. Retrieved May 10, 2007.
  13. ↑ a b Knabb: Subtropical Depression Andrea Discussion Five . National Hurricane Center. 2007. Retrieved May 10, 2007.
  14. ^ Rhome: Subtropical Depression Andrea Discussion Seven . 2007. Retrieved May 10, 2007.
  15. ↑ Knabb: May 11 Special Tropical Disturbance Statement . National Hurricane Center. 2007. Retrieved May 11, 2007.
  16. ↑ Franklin: May 12 Special Tropical Disturbance Statement . National Hurricane Center. 2007. Retrieved May 13, 2007.
  17. ↑ Beven: May 13 Special Tropical Disturbance Statement . National Hurricane Center. 2007. Retrieved May 13, 2007.
  18. ^ National Hurricane Center: June 1 Tropical Weather Outlook . Retrieved on June 1, 2007.  ( Page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.@1@ 2Template: dead link / ftp.met.fsu.edu  
  19. ^ Knabb: Subtropical Storm Andrea Public Advisory One . National Hurricane Center. 2007. Retrieved May 9, 2007.
  20. ↑ a b Jennifer Wilson: Forecasters: Subtropical Storm Andrea has formed . WIStv Columbia, South Carolina. 2007. Archived from the original on February 7, 2012. Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved May 9, 2007. @1@ 2Template: Webachiv / IABot / www.wistv.com
  21. ↑ a b c d e Season's first named storm unleashes band of rain. The Virginian-Pilot, May 10, 2007, accessed February 10, 2020 (English, not available from Europe).
  22. ↑ Willis: May 8 Tropical Weather Discussion . National Hurricane Center. 2007. Retrieved May 9, 2007.
  23. ↑ Jessica Gresko: Year's first named storm becomes Andrea, forms 3 weeks before hurricane season begins . Associated Press. 2007. Retrieved May 9, 2007.
  24. ↑ Virginia Pilot: High drama on high seas . May 8, 2007. Retrieved May 9, 2007. 
  25. ^ Sunbeam Television: Coast Guard continues search for missing sailors . 2007. Archived from the original on May 13, 2007. Info: The archive link was automatically inserted and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved May 10, 2007. @1@ 2Template: Webachiv / IABot / www3.whdh.com
  26. ↑ Amanda Milkovits: Sailors' circle holds hope . The Providence Journal. 2007. Retrieved May 18, 2007.
  27. ^ Associated Press: First named '07 Atlantic storm forms near coast . 2007. Retrieved May 9, 2007.
  28. ↑ Associated Press: DNA identifies missing Atlanta kayaker's body in SC . 2007. Retrieved May 26, 2007.
  29. ↑ a b Virginia Pilot: Wind and chill chase away spring today's weather . May 7, 2007. Retrieved May 9, 2007. 
  30. ^ Francine Sawyer: Storm moving away from the coast . New Bern Sun Journal. 2007. Retrieved May 9, 2007.
  31. ^ Bryan Mims: Offshore Storm System Raked NC Beaches . WRAL.com. 2007. Retrieved May 9, 2007.
  32. ^ A b c Keegan, Shashy, McAllister, & Enyedi: Post-Tropical Cyclone Report . Jacksonville, Florida National Weather Service. 2007. Archived from the original on May 20, 2007. Retrieved May 19, 2007.
  33. ↑ Erika Pesantes, Sally Apgar and Chrystian Tejedor: Sweeping erosion hits Palm Beach County coast: Low-pressure system sucks swaths of sand; Jupiter feels brunt of it , South Florida Sun-Sentinel. May 9, 2007. Retrieved May 9, 2007. 
  34. ^ Tanya Caldwell: Holly Hill surfer drowns after taking on 'gigantic wave' in New Smyrna Beach . Orlando Sentinel . 2007. Archived from the original on May 21, 2007. Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved May 10, 2007. @1@ 2Template: Webachiv / IABot / www.orlandosentinel.com
  35. ↑ Staff Writer: Subtropical storm Andrea is swirling off the north Florida coastline . Bradenton Herald. 2007. Accessed on May 9, 2007.  ( Page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.@1@ 2Template: Dead Link / www.bradenton.com  
  36. ↑ CNN Staff Writer: Atlantic's first named storm whips up wildfires . CNN. 2007. Retrieved May 10, 2007.
  37. ↑ Kevin Spear and Jim Stratton: 'Fire of a lifetime' hits North Florida , Orlando Sentinel. May 12, 2007. Retrieved May 13, 2007.