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Tropical Storm Vamco (11W) Forms, Tropical Depression Maka (01C) Weakens – August 18th, 2009

16.6N 158.9E

August 18th, 2009 Category: Image of the day, Tropical Storms

Formation of Tropical Storm Vamco - August 16th, 2009

Formation of Tropical Storm Vamco - August 16th, 2009

Enhanced image of TS Vamco

Enhanced image of TS Vamco

Tracks of TS Vamco and TD Maka - August 18th, 2009 © Univ. of Wisconsin

Tracks of TS Vamco and TD Maka

Tropical Storm Vamco (11W) has formed in the Pacific and is located approximately 1045 nautical miles east-southeast of Iwo-To.

The system has tracked northwestward at 9 knots over the past six hours. Maximum significant wave height is 13 feet.

Tropical Storm Vamco began forming on August 14, as an area of convectional cloudiness associated with a monsoon. While the main image focuses on the formation of Vamco, the animated image shows both Vamco, left, and Tropical Depression Maka (01C), right.

Maka is currently located approximately 320 nautical miles southeast of Wake Island, and has tracked westward at 5 knots over the past six hours. Maximum significant wave height is 12 feet.

Recent animated multispectral imagery of 01C shows an exposed low level circulation center (LLCC) that has become increasingly elongated and less organized in the last 6 hours. An ASCAT pass shows a closed circulation with 5 knot winds on the south side of the LLCC and 15-20 knot winds on its north side.

Environmental analysis shows Maka is continuing to move into higher levels of vertical wind shear with sea surface temperatures remaining favorable. In the upper-level, a tropical upper tropospheric trough (TUTT) to the north places the system in an area of strong upper-level confluence that has suppressed outflow.

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