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{{dablink|This article is about the ] ]. For other storms of the same name, see ]}} {{dablink|This article is about the ] ]. For other storms of the same name, see ]}}


'''Tropical Storm Laura''' was a relatively short lived ] which developed over the north-central ] in late September during the ]. The 12th named storm of the season, 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. Shortly after being declared tropical, Laura began to undergo an extratropical transition, which did not fully take place until the morning of October 1. Laura degenerated into a post-tropical cyclone later that morning, and the final advisory by the ] was issued. '''Tropical Storm Laura''' was a relatively short lived ] which developed over the north-central ] in late September during the ]. The 12th named storm of the season, Laura formed out of a large ] ] located about 1015 ] (1635 ]) west ] 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. Shortly after being declared tropical, Laura began to undergo an extratropical transition, which did not fully take place until the morning of October 1. Laura degenerated into a post-tropical cyclone later that morning, and the final advisory by the ] was issued.


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

Revision as of 22:16, 7 February 2009

Tropical Storm Laura
Tropical Storm (SSHWS/NWS)
Tropical Storm Laura at peak intensity on September 30.
FormedSeptember 29, 2008
DissipatedOctober 1, 2008
Highest winds1-minute sustained: 60 mph (95 km/h)
Lowest pressure994 mbar (hPa); 29.35 inHg
FatalitiesNone
DamageMinimal
Areas affectedNetherlands, British Isles, Norway (when extratropical)
Part of the 2008 Atlantic hurricane season
This article is about the 2008 Atlantic tropical storm. For other storms of the same name, see Tropical Storm Laura

Tropical Storm Laura was a relatively short lived tropical cyclone which developed over the north-central Atlantic Ocean in late September during the 2008 Atlantic hurricane season. The 12th named storm of the season, Laura formed out of a large extratropical area of low pressure located about 1015 miles (1635 km) west 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. Shortly after being declared tropical, Laura began to undergo an extratropical transition, which did not fully take place until the morning of October 1. Laura degenerated into a post-tropical cyclone later that morning, and the final advisory by the National Hurricane Center was issued.

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

On September 26, a extratropical area of low pressure developed along a quasi-stationary frontal system a few hundred miles west of the Azores. The low intensified into the equivalent of a Category 1 hurricane with winds of 80 mph (130 km/h) at 12:00 UTC on September 27. Over the following days, the low began to lose its frontal features and began to transition into a subtropical cyclone as it traveled in a general westward direction. 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 was 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, 40.6°N. Not long after being declared tropical, early signs of an extratropical transition appeared. Cold air began to enter the storm on the west side and forecast models showed Laura becoming extratropical the next morning and non-tropical later the next day.

Laura on September 29

Overnight, convection associated with Laura began to diminish and lose tropical characteristics, but still retained its status. Early on October 1, the extratropical transition was fully apparent. Laura remained tropical but the cloud pattern was becoming frontal and there was little convection around the center of the system. With minimal shower and thunderstorm activity remaining around the center of Laura, the storm degenerated into a remnant-low pressure area on October 1 while still producing tropical storm-force winds. The next day, the remnant system transitioned into an extratropical cyclone and began to re-intensify as it rapidly tracked towards the north. Early on October 3, the system slowed down as it turned towards the east and strengthened into a hurricane-force cyclone with winds of 75 mph (120 km/h). After accelerating towards the east, another large extratropical cyclone absorbed the remnants of Laura while located several hundred miles west of the British Isles on October 4.

Impact

As a tropical cyclone, Laura never approached land, and no effects, damages, or fatalities occurred. However, the storm's remnants were caught in an upper-level jet stream, and steered towards Europe. Heavy rain fell across portions of Britain, causing localized accumulation of flood waters. As a result, Glebe Road near Windermere, England was closed in both directions, and along the A65 road between Old Hutton and Kirkby Lonsdale, previously saturated soil, combined with overwhelmed storm drains resulted in localized flooding. Traffic on the M6 Motorway was slowed due to poor driving conditions.

After the remnants of now extratropical Laura made final landfall on the southern coast of the Netherlands, its rain bands started interacting with a cold front associated with a well-developed low west of Norway, dropping up to 113 mm (4.5 in) of precipitation in the Northwestern Netherlands, flooding streets and homes in the village of Hippolytushoef. More than 10,000 people lost electricity in southern Norway because of damage to the electrical system caused by the remnants of the storm.

See also

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References

  1. ^ Richard J. Pasch (February 4, 2009). "Tropical Storm Laura Tropical Cyclone Report" (PDF). National Hurricane Center. Retrieved February 7, 2009.
  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.
  9. Berg/Pasch (2008). "Tropical Storm Laura Discussion Seven". National Hurricane Center. Retrieved 2008-10-01.
  10. Avila (2008). "Tropical Storm Laura Discussion Eight". National Hurricane Center. Retrieved 2008-10-01.
  11. Beven (2008). "Tropical Storm Laura Discussion Nine". National Hurricane Center. Retrieved 2008-10-01.
  12. Paul Simons (2008). "Weather: torrential rain expected as strong winds hit Wales and the South West". The Times. Retrieved 2008-10-05. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)
  13. Staff Writer (2008). "Tropical storm brings floods". The Westmorland Gazette. Retrieved 2008-10-05. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)
  14. Template:Nl icon Rob Sluijter (2008). "5 oktober 2008: Wateroverlast in het noordwesten". KNMI. Retrieved 2008-10-08. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)
  15. Template:Nl icon Meteo Consult (2008). "De Noord-Hollandse 'zondvloed' nader bekeken". Meteo Consult. Retrieved 2008-10-08. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)
  16. Template:Nl icon Agnes Svalastog (2008-10-05). NRK.no: Kraftig uvær på Østlandet "Kraftig uvær på Østlandet". NRK. Retrieved 2009-02-07. {{cite web}}: Check |url= value (help)

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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