(Associated Press) – Forecasters say they expect Tropical Storm Helene in the Caribbean Sea to strengthen rapidly and become a hurricane as it moves north across the Gulf of Mexico toward the United States.

The National Hurricane Center has issued hurricane warnings for northwestern Florida’s coastline and part of Mexico’s Yucatan Peninsula.

Helene is forecast to be “near hurricane strength” when it passes near the Yucatan Peninsula before becoming a hurricane Wednesday.

Forecasters say the entire west coast of Florida faces a possibly life-threatening storm surge.

President Joe Biden has declared an emergency in the state.

The developments come after Tropical Storm John slammed Mexico’s Pacific coast late Monday, leaving two dead and a trail of destruction.