PENSACOLA BEACH, Fla. Brewing in the Gulf of Mexico, Tropical Storm Claudette threatened to bring heavy rain to the Florida Panhandle later Sunday, likely becoming the first tropical storm to strike the U.S. mainland this year.

Claudette had winds of at least 50 mph, but was not expected to cause significant flooding or wind damage. Lurking more ominously in the Atlantic were tropical storms Ana and Bill, which was quickly turning into a powerful storm over warm waters in the open Atlantic.