#822 Postby Coredesat » Wed Dec 12, 2007 7:21 pm
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Tropical Depression OLGA (17L)
TIME: 0000 UTC 13 December 2007
FCST: 05
PSTN: 18.8°N 77.2°W FAIR (2315Z GOES-10 IR2/IR4/BD-IR)
WIND: 350 kt
PRES: 1009 hPa
MOVE: WSW 15 kt
Dissipating as a significant tropical cyclone over water
Olga (17L) has lost most of its associated convection and has weakened to a tropical depression. A few weak and transient puffs of sheared convection have flared near the center, but most of the convection in the area is no longer associated with the system and is 5-6 degrees north and east of the center. Surface observations nearer to the center indicate only light winds, and the system is unclassifiable with the Dvorak technique; the intensity estimate of 30 kt may be too generous.
As stated previously, Olga is being steered by very strong low-level easterly flow under a strong ridge of high pressure over the southeastern United States. This strong low-level flow combined with strong upper-level shear is producing an extremely unfavorable shear environment for the system. Dry air is also becoming entrained into the circulation, and as a result all I expect from here on out is rapid weakening and dissipation within 18-24 hours. The low-level flow should steer what's left of Olga west-northwestward toward the Gulf of Mexico, where the remnants should become absorbed into an approaching frontal system.
12HR FCST: 19.1°N 79.8°W
WIND/PRES: 20 kt/1009 hPa
Dissipating as a significant tropical cyclone over water
24HR FCST: 19.7°N 82.4°W
WIND/PRES: DISSIPATED
Dissipated as a significant tropical cyclone over water
Next update: 0600 UTC 13 December 2007
Next forecast: N/A
Weaver
No graphics are associated with this forecast. This is the last forecast on Olga. The system will be closely monitored for signs of regeneration.
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