4 pm tropical update: Hurricane Sally track shifts east - a Category 2 storm with 100 mph winds

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As of the 4 PM CDT advisory from the National Hurricane Center, Sally has further intensified to a Category 2 hurricane with sustained winds of 100 mph. This increase in winds has verified that the storm has indeed undergone rapid intensification.

Rapid intensification is defined as a jump in sustained winds by 30 knots or near 35 mph in a period of 24 hours according to the National Hurricane Center.

As of Sunday's 4 PM advisory Sally was a tropical storm with winds of 60 mph. This afternoon's 4 PM advisory has Sally as a Category 2 hurricane with winds of 100 mph. An increase in sustained winds of 40 mph which satisfies the definition for rapid intensification.

Sally was struggling with persistent wind shear throughout the day yesterday that gradually relaxed overnight. The storm once again became more vertically stacked and intensification began quickly.

The location of Sally over extremely warm waters in the Gulf of Mexico means it has almost an endless supply of energy. The warm waters also extend down to a depth which due to upwelling will continuously supply the storm with more warm waters.
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