Parts of Central America may see potentially catastrophic flash flooding, mudslides and loss of lives and property as a slow-moving, strengthening Tropical Storm Sara bears down on Honduras, the latest update from the National Hurricane Center.

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.