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Super Typhoon Choi-Wan

18.6N 146.9E

September 16th, 2009 Category: Tropical Cyclones

Super Typhoon Choi-Wan - September 16th, 2009

Super Typhoon Choi-Wan - September 16th, 2009

Enhanced image - September 16th, 2009

Enhanced image

Track of Choi-Wan - September 16th, 2009 © Univ. of Wisconsin

Track of Choi-Wan

Super Typhoon 15W Choi-Wan, located approximately 250 nm north-northwest of Saipan, has tracked west-northwestward at 09 knots over the last 06 hours.

Recent animated multispectral satellite imagery shows an impressive system with deep convective banding wrapping into a center with a well defined eye. Intensity is based on estimates from PGTW, KNES and RJTD.

Choi-Wan has tracked along the southwestern periphery of a mid-level subtropical ridge (STR) that extends from northeast of Choi-Wan into the vicinity of Iwo To.

Track speeds have remained fairly consistent over the past 12 hours, ranging from 08 to 10 knots. A tropical upper tropospheric trough (TUTT) to the northeast has continued to provide good eastward outflow, in addition to an upper level point source anticyclone over Choi-Wan that has been providing strong radial outflow over the past 24 hours.

The multiple outflow mechanisms in concert with high values of ocean heat content (OHC) and sea surface temperatures (SST) have allowed for Choi-Wan to intensify further over the past 12 hours.

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