Now a Hurricane in the Gulf of Mexico

Karl on Sept. 15 and 16. On September 15 at 2153 UTC (5:53 p.m. EDT) Tropical storm Karl was still powerful and very well organized even though it had been over the Yucatan Peninsula for over nine hours. TRMM's Precipitation Radar showed that a cluster of very intense thunderstorms were dropping extreme amounts of rain near the storms center and along a feeder band in the western part of the storm.

Karl moved into the southern Gulf of Mexico between 0330 and 0430 UTC (near midnight Eastern Daylight Time). At 0603 UTC (2:03 a.m. EDT) as Karl was already in the Gulf, TRMM saw light to moderate rainfall occurring in the storm, falling at a rate between .78 to 1.57 inches per hour. Once Karl moved farther into the Gulf, the rainfall rates increased as Karl became a hurricane.

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