By early next week, we might be talking about a Category 5 hurricane, but widespread flooding is going to be the most impactful threat from Melissa. Here's how bad it could get in Haiti and Jamaica.

Melissa may be struggling now, but it is expected to rapidly intensify. It's also going to be a slow mover into early next week. Here's what that means for its forecast.

Tropical Storm Melissa grounded to a halt over the central Caribbean about 150 miles south of Jamaica and Haiti early Friday.

Tropical Storm Melissa is barely moving through the Caribbean, and that’s exactly what makes it so dangerous. The longer it lingers, the more rain it dumps. Haiti, Jamaica and the Dominican Republic could face days of relentless downpours and mudslides.