Helene is taking aim at the Florida Panhandle, where it's forecast to make landfall as a hurricane on Thursday.

Tropical Storm Helene formed over the northwestern Caribbean on Tuesday and triggered a tropical storm warning for the Lower Florida Keys. The storm is forecast to be a major hurricane for the Florida panhandle Thursday.

Heavy rains lashed the Cayman Islands on Tuesday as forecasters warned that a nearby cluster of thunderstorms could soon become a major hurricane en route to the southeast U.S.