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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.

Tropical Depression Maka (01C) Expected to Strengthen

16.6N 175.0E

August 18th, 2009 Category: Tropical Storms

Tropical Storm Maka - August 15th, 2009

Tropical Storm Maka - August 15th, 2009

Enhanced image

Enhanced image

Track of Maka - August 17th, 2009 © Univ. of Wisconsin

Track of Maka

Tropical Depression Maka (01C), located approximately 370 nautical miles east-southeast of Wake Island, has tracked northwestward at 3 knots over the past six hours.

Animated multispectral imagery shows that convection has recently started to flare over the eastern half of the system.

Nevertheless, the system was downgraded to tropical depression strength due to a lack of convection over a fully-exposed low level circulation center (LLCC) and declining Dvorak estimates.

Maka is tracking northwestward along the southern periphery of a low- to mid-level subtropical ridge anchored around 30N 160E and should start to gradually reintensify as it moves further away from the tropical upper tropospheric trough (Tutt) cell and into an environment of more favorable (less than 30 knots) vertical wind shear. Maximum significant wave height is 18 feet.