Tropical Storm Helene threatens Florida, placing most of the state on high alert as it is one of the strongest storms to make landfall in the United States in over a year, according to CNN.

Tropical Storm Helene has formed in the Caribbean Sea, and forecasters say it will strengthen into a major hurricane.

Tropical Storm Helene formed in the northwestern Caribbean Sea on Tuesday, but National Hurricane Center forecasters expected the storm to quickly turn into a hurricane by Wednesday as it enters the unusually warm waters of the Gulf of Mexico.