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In order for a hurricane to form or gain strength, the ocean surface temperature must be 82-degrees Fahrenheit or warmer. On Oct. 20 the yellow, orange and red areas in this Aqua satellite image indicate areas where the water temperature was 82 degrees F or warmer. The ocean surface temperature surrounding Wilma was about 85 degrees F at the time.
Weather forecasters predict that Wilma's wind speed will increase in the near term, then gradually drop.
Pressure readings from the storm dropped to 882 millibars on Wednesday, Oct. 19, the lowest ever recorded.