Tropical Storm Melissa is expected to rapidly intensify over the weekend into a Category 4 hurricane, and could get even stronger. Tropical Storm Melissa is expected to rapidly intensify over the weekend into a Category 4 hurricane, according to the National Hurricane Center.

Melissa has already proven to be deadly. Haiti's civil protection agency says three people have already been killed in the country, per the New York Times. Two deaths were the result of a landslide in Port-au-Prince, while the third was caused by a falling tree on the country's south coast in the town of Marigot.

Tropical Storm Melissa is expected to bring days of heavy rain to the Dominican Republic, Haiti and Jamaica and may trigger life-threatening flash flooding, the National Hurricane Center says.

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.

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.