Tropical Storm Melissa is forecast to become a hurricane within hours, but the exact track remains uncertain — as does its threat to Florida. Here’s the latest forecast.

"There is significant uncertainty in the track and intensity forecast of Melissa," NHC forecaster Philippe Papin wrote in an 11 a.m. update, though forecasters said it's not likely to reach the Gulf.

The National Hurricane Center also is monitoring two other tropical waves, in addition to Tropical Storm Melissa: The axis of an eastern Atlantic tropical wave is near 25W, south of 14N, moving west at 11 mph. A tropical wave along 30W extends south of 15N, and is nearly stationary.