Tropical Storm Sara now threatens to wreak havoc over Central America with days of heavy rain, flooding and mudslides. Where is it going next?

Tropical Storm Sara formed in the Caribbean on Thursday afternoon and is expected to curl into the Gulf of Mexico and steam toward Florida next week, though forecast models no longer anticipate it might power up to a major hurricane — if it even becomes a hurricane at all.

In a worst-case scenario for the U.S., a major hurricane could hit Florida's Gulf coast, but forecasters say it would have to clear several hurdles.