Isaac won't be a hurricane over Florida Keys

Shira Edllan Gervasi, of Israel, puts her name on plywood protecting a storefront in Key West, Fla., in anticipation of Tropical Storm Isaac on Saturday, Aug. 25, 2012.  Isaac's winds are expected to be felt in the Florida Keys by sunrise Sunday morning. (AP Photo/Alan Diaz)
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Shira Edllan Gervasi, of Israel, puts her name on plywood protecting a storefront in Key West, Fla., in anticipation of Tropical Storm Isaac on Saturday, Aug. 25, 2012. Isaac's winds are expected to be felt in the Florida Keys by sunrise Sunday morning. (AP Photo/Alan Diaz)

MIAMI (AP) — Forecasters say it's unlikely that Tropical Storm Isaac will strengthen into a hurricane before it hits the Florida Keys.

However, it is still expected to gain strength as it moves over the open waters of the Gulf of Mexico. It could make landfall somewhere along the northern Gulf Coast. It's not clear exactly where it will hit, but forecasters say hurricane conditions are possible anywhere from the New Orleans area to the Florida Panhandle.

Isaac already started pelting the Florida Keys with rain and strong winds on Sunday.

The U.S. National Hurricane Center in Miami says Isaac was about 50 miles (80 kilometers) south-southeast of Key West, Fla. Its top sustained winds had decreased to 60 mph (97 kph).