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'''Tropical Storm Laura''' is the twelfth named storm of the ]. Laura formed out of a large non-tropical low pressure area located 1015 ] (1635 ]) west of the western islands of the ] on September 29. Laura slowly developed tropical characteristics throughout the day as it moved over warmer waters. On the afternoon of September 30, Laura had acquired enough tropical characteristics to be designated a Tropical Storm. '''Tropical Storm Laura''' is the twelfth named storm of the ]. Subtropical Storm Laura formed out of a large non-tropical low pressure area located 1015 ] (1635 ]) west of the western islands of the ] on September 29. Laura slowly developed tropical characteristics throughout the day as it moved over warmer waters. On the afternoon of September 30, Laura had acquired enough tropical characteristics to be designated a Tropical Storm.


==Meteorological History== ==Meteorological History==

Revision as of 02:15, 1 October 2008

Globe icon with a red clock.This article is about Tropical Storm Laura, a current tropical cyclone where information can change quickly or be unreliable. The latest page updates may not reflect the most up-to-date information. Please help improve this article using reliable sources or help by discussing changes on the talk page. (Learn how and when to remove this message)
Tropical Storm Laura
Current storm status
Tropical storm (1-min mean)
Satellite image Forecast map
As of:5 p.m. AST (2100 UTC) September 30
Location:42.3°N 48.6°W ± 20 nm
About 375 mi (605 km) SE of Cape Race
Sustained winds:50 knots | 60 mph | 95 km/h (1-min mean)
gusting to 60 knots | 70 mph | 110 km/h
Pressure:996 mbar (hPa) | 29.41 inHg
Movement:N at 12 kt | 14 mph | 22 km/h
See more detailed information.

Tropical Storm Laura is the twelfth named storm of the 2008 Atlantic hurricane season. Subtropical Storm Laura formed out of a large non-tropical low pressure area located 1015 miles (1635 km) west of the western islands of the Azores on September 29. Laura slowly developed tropical characteristics throughout the day as it moved over warmer waters. On the afternoon of September 30, Laura had acquired enough tropical characteristics to be designated a Tropical Storm.

Meteorological History

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key Saffir–Simpson scale   Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown Storm type circle Tropical cyclone square Subtropical cyclone triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

In late September, a large non-tropical system located over the north-central Atlantic slowly moved westward away from the Azores. The low produced hurricane-force winds, but did not exhibit the characteristics of a tropical cyclone. The storm steadily weakened over the following days, but developed tropical characteristics as it moved over slightly warmer waters. By September 29, the low had developed sufficient convection and was declared Subtropical Storm Laura. Upon being upgraded, cold cloud tops began to wrap around the center of Laura and consolidate near the center of circulation. The convection organized around the center quickly and a satellite pass over the storm revealed that it could be intensifying. A later satellite pass disregarded the possibility of intensification as the intensity was confirmed to be at 60 mph (95 km/h). The overall structure of Laura remained subtropical but there were indications that it might have been acquiring tropical characteristics.

During the afternoon, satellites revealed that Laura had developed a deep warm core, a characteristic of a tropical cyclone, but the wind field remained subtropical in nature. By the nighttime hours, the radius of the strongest winds contracted to 80 mi (130 km), much smaller than what is typical of a subtropical cyclone. However, Laura was still under the influence of an upper-level low and cloud tops remained shallow. However, the cloud tops became colder overnight and Laura was on the verge of becoming a tropical cyclone by the morning of September 30, but strong interaction with the upper-level low meant it was still subtropical. Despite moving over colder waters, a water vapor satellite image determined that Laura had separated itself from the upper-level low, signifying it had developed into a tropical cyclone. Laura was upgraded to a tropical storm at a relatively high latitude, 41.2°N.

Impact

Tropical Storm Laura, as of September 30, is located over the open waters of the North Atlantic and has not caused any impact on land.

Current storm information

As of 5 p.m. AST (2100 UTC) September 30, Tropical Storm Laura is located within 20 nautical miles of 42.3°N 48.6°W, about 375 mi (605 km) southeast of Cape Race, Newfoundland. Maximum sustained winds are 50 knots (60 mph, 95 km/h), with stronger gusts. Minimum central pressure is 996 mbar (hPa; 29.41 InHg), and the system is moving north at 12 kt (14 mph, 22 km/h).

Tropical storm-force winds extend out up to 230 mi (370 km) from the center of Laura. It is currently not a threat to any land areas.

Official Infomation

For latest official information see:

See also

Template:Tcportal

References

  1. NHC (2008). "12L 2008 Trackfile". National Hurricane Center. Retrieved 2008-09-29.
  2. Stewart (2008). "Subtropical Storm Laura Public Advisory One". National Hurricane Center. Retrieved 2008-09-29.
  3. Stewart (2008). "Subtropical Storm Laura Discussion One". National Hurricane Center. Retrieved 2008-09-29.
  4. Berg/Pasch (2008). "Subtropical Storm Laura Discussion Two". National Hurricane Center. Retrieved 2008-09-29.
  5. Berg/Franklin (2008). "Subtropical Storm Laura Discussion Three". National Hurricane Center. Retrieved 2008-09-30.
  6. Franklin (2008). "Subtropical Storm Laura Discussion Four". National Hurricane Center. Retrieved 2008-09-30.
  7. Beven (2008). "Subtropical Storm Laura Discussion Five". National Hurricane Center. Retrieved 2008-09-30.
  8. Berg/Pasch (2008). "Tropical Storm Laura Discussion Six". National Hurricane Center. Retrieved 2008-09-30.

External links

Tropical cyclones of the 2008 Atlantic hurricane season
TSArthur 3Bertha TSCristobal 2Dolly TSEdouard TSFay 4Gustav (history) 1Hanna 4Ike TSJosephine 1Kyle TSLaura TSMarco TSNana 4Omar TDSixteen 4Paloma
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