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.

Though the full effects of Tropical Storm Melissa have yet to be felt in the Caribbean, Haiti’s disaster office said Friday three people have already died and another was injured in a landslide attributed to the storm’s heavy rains.

Tropical Storm Melissa is on track to threaten Haiti as a hurricane over the weekend, bringing heavy rains and life-threatening flooding to the island nation. Jamaica and Cuba also could feel the effects as the storm meanders slowly north in the Caribbean.

Tropical Storm Melissa is showing signs of becoming a bit more organized. current data indicate that the storm's structure is still not quite aligned, and its overall circulation is poorly defined