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Cyclone 24S Strengthens, Renamed Sean

Posted by feww on April 24, 2010

Cyclone 24S powers up, renamed Tropical Storm Sean

The Atmospheric Infrared Sounder (AIRS), instrument that flies aboard NASA’s Aqua satellite from April 22 at 17:29 UTC (1:29 p.m. EDT) showed some strong, high, cold thunderstorms around Sean’s center.

Infrared imagery is false-colored and higher cloud tops of stronger storms are depicted in purple. Sean showed a circular area of high, strong thunderstorms around his center of circulation. Those highest thunderstorms are as cold as or colder than 220 Kelvin or minus 63 degrees Fahrenheit (F).

On Friday, April 23 at 1500 UTC (11 a.m. EDT) Tropical Storm Sean had maximum sustained winds near 45 knots (52 mph). It was about 475 nautical miles north of Learmonth, Australia, near 14.4 South and 113.3 East. It was moving southeast at 4 knots (5 mph).

Animated infrared satellite imagery shows convective banding (that is, rapidly rising air that condenses and form thunderstorms) keeps wrapping into the low-level center of the storm, from both the south and east of the center. Forecasters at the Joint Typhoon Warning Center note that conditions are still good for further intensification over the next 12-24 hours, but then Sean will encounter vertical wind shear and begin weakening over the weekend.

Sean is a sea storm, and will not affect any land areas over the weekend. Image and Text: NASA/Goddard Space Flight Center

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