The National Hurricane Center continued to keeps its focus Friday on what had been Category 4 major Hurricane Helene as it moved inland as a tropical storm, but also was keeping tabs on newly formed Tropical Storm Joyce and Hurricane Isaac in the Atlantic and two more systems with a chance to develop into the season’s next tropical depression or storm.

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.