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.

A shift in Tropical Depression 19's track has significantly impacted meteorologists' predictions about its potential to form into Hurricane Sara.

A storm system, which would earn the name “Sara,” is expected to form soon in the Caribbean, and could affect the United States down the road. It’s too early to know exactly where the storm will go once it forms and what areas will be affected — particularly because the system has no established center of circulation yet.