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Large-Diameter Eye of Typhoon Vamco

27.6N 155.3E

August 25th, 2009 Category: Tropical Storms

Typhoon Vamco - August 22nd, 2009

Typhoon Vamco - August 22nd, 2009

Enhanced image - August 22nd, 2009

Enhanced image

Track of Vamco - August 24th, 2009 © Univ. of Wisconsin

Track of Vamco

Typhoon Vamco (11W), located approximately 990 nautical miles northwest of Wake Island, has tracked northward at 11 knots over the past six hours.

Recent visible satellite imagery trends indicate the system has a large eye of 46 nautical miles in diameter, has lost of most of the feeder bands, and has become much more axisymmetric.

An SSMI image shows a very well defined ring of convection around a large eye feature with no convective banding.

The typhoon will encounter an approaching midlatitude system after TAU 24, but its annular characteristics will help isolate it from the environment and will delay full extra-tropical transition.

Vamco will eventually succumb to the effects of lower sea surface temperatures and higher vertical wind shear as it finally goes extra-tropical by TAU 48. Maximum significant wave height is 25 feet.

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