Melissa, with maximum winds of 70 mph and stronger gusts, should attain hurricane status later Oct. 25 and become a major hurricane by Sunday, the National Hurricane Center said Saturday morning. A tropical storm becomes a hurricane when its winds reach 74 mph.

Cuba, the Dominican Republic, Haiti and Jamaica are bracing for Hurricane Melissa. The storm is expected to quickly grow into a powerful category 3 or stronger hurricane.

After it lashes the Caribbean this weekend, there’s still uncertainty about where the storm will go next. Here are the scenarios, one day at a time.

Tropical Storm Melissa is expected to strengthen into a hurricane, threatening the northern Caribbean with massive rainfall and life-threatening flooding

The hot ocean temperatures and dry air are primed for a potentially explosive hurricane to erupt, with some severe weather impacts possible for Florida.

The base commander on Saturday expanded a previous evacuation order to include “non-mission-essential U.S. citizens.”

The storm is expected to hit Jamaica, Haiti and the Dominican Republic, as well as Cuba, the Bahamas, and the Turks and Caicos.

Tropical Storm Melissa has already turned deadly. As the storm strengthens throughout the weekend, we expect to see catastrophic impacts in the Caribbean. At least three people have been reported killed by landslides and falling trees in Haiti, while one person is dead and another is reported missing in the Dominican Republic.