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Impacts to Florida from Tropical Storm Isaías Still Uncertain

Tropical Storm Isaias became the season’s ninth named tropical storm late Wednesday evening. It may pose a threat to the United States coastline this weekend or early next week, but questions remain about its eventual track and strength.

As of mid-morning Thursday, Isaias had top sustained winds of 60 mph as it moved northwestward near 20 mph about 125 miles west of Ponce, Puerto Rico. The National Hurricane Center said the storm was causing life-threatening flash floods and high winds over the island Thursday morning.

NO CURRENT STORMS IN ATLANTIC BASIN

The forecast track takes the tropical storm over the island of Hispaniola today, where there is mountainous terrain that is likely to temporarily disrupt the recent strengthening trend for a brief time. Forecasters say heavy rain is likely to cause flash flooding and mudslides along with the tropical storm force winds over the island today into tonight as it approaches.

Isaias is forecast to reach the southeastern Bahamas late tonight into Friday. Reliable forecast models show two broadly different scenarios this weekend. If the storm remains strong and largely survives the path over Hispaniola, the storm is likely to strengthen and become a strong tropical storm, staying near or just offshore the Florida east coast this weekend. This would result in an increase in seas and rip currents, but the worst of the storm would stay offshore. This path would also increase the threat of more significant impact on Monday in the Carolinas. The Hurricane Center said in their early Thursday morning discussion that there are models that forecast Isaias to reach hurricane intensity, but that there is large uncertainty in the future strength of the storm.

If the storm is generally weaker, steering currents would likely direct Isaias toward the Florida Peninsula with heavy rain, gusty winds, and choppy seas beginning Saturday over South Florida and then spreading northward through the Peninsula on Sunday. A weaker storm would also have potentially fewer impacts in the Carolinas, but some increase in seas and rip currents would remain a distinct possibility with a weaker system.

Forecasters encourage everyone to keep up with the latest forecasts as changes to the forecast track and intensity are likely after the storm passes Hispaniola. Emergency management officials encourage everyone to review their plans and prepare regardless of the storm’s eventual path and strength.

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Sources include nearest National Weather Service office, National Hurricane Center, and the Florida Public Radio Emergency Network (@FloridaStorms).
Sources include nearby emergency management agencies, FEMA, and your local NPR affiliate. 
Sources include the Florida Department of Transportation, Florida Highway Patrol and other nearby traffic information.

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