Friday, August 13, 2010

Depression Dianmu Dying Down in Sea of Japan


Once a tropical storm, Dianmu is still traveling in a northeasterly direction through the Sea of Japan, but has diminished to a tropical depression with maximum sustained winds near 34 mph.

Dianmu is being battered by increasing vertical wind shear and cooler sea surface temperatures as it completes a transition into an extra-tropical storm. At 0300 UTC on August 12 (11 p.m. EDT on August 11) the Joint Typhoon Warning Center forecasters in Hawaii issued their final warning on the storm. At that time, Dianmu was located about 285 nautical miles west-southwest of Misawa, Japan, near 38.7 North and 137.1 East.

Sea surface temperatures of at least 80 degrees Fahrenheit are needed to support a tropical cyclone, but warmer temperatures are needed for intensification. The Joint Typhoon Warning Center noted that warmer temperatures are not in Dianmu's area and that temperatures are between 75 and 78F (24-26 Celsius).


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