Erin is expected to become a hurricane Aug. 15.

Current forecasts predict Erin's winds will hit 125 mph Aug. 17.

Dangerous surf and rip currents are possible for Florida and the U.S. east coast.

Tropical Storm Erin is starting to strengthen as it continues its westward path across the Atlantic, according to the latest advisory from the

Erin is expected to become a hurricane Friday, Aug. 15 and a major hurricane by Sunday morning. A major hurricane is a Category 3 or stronger storm with maximum sustained winds of at least 111 mph.

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The current forecast calls for Erin's winds to increase to 125 mph within five days, making it a strong Category 3 storm. A Category 4 storm has maximum sustained winds of at least 130 mph. Hurricane News: Get the latest hurr

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