Tropical Storm Melissa, which is taking aim on the Caribbean, may strengthen to a hurricane in the next 24 to 48 hours.

The storm will stay away from the mainland United States. Instead, Melissa poses the biggest threat to Haiti, the Dominican Republic, Cuba and Jamaica, where days of heavy rain and severe winds could lead to life-threatening landslides.

Here’s the latest forecast:

Melissa is moving over water temperatures 4 to 5 degrees above average for this time of year, which will help it strengthen from a tropical storm into a hurricane.

Melissa is expected to approach Jamaica and the southwestern portion of Haiti later this week.

The storm is forecast to bring 5 to 10 inches of rain to the southern Dominican Republic, southern Haiti and eastern Jamaica through Saturday. Significant flash flooding and landslides are possible.

Across the northern Dominican Republic, northern Haiti and western Jamaica, 2 to 4 inches of rain are expected through Saturday.

Aruba and Puerto Rico could see less severe impacts from Melissa’s outer bands. One to 3 inches of rain is in the forecast and flooding is possible.

A hurricane watch is in effect for the southwestern peninsula of Haiti, from the border with the Dominican Republic to Port-Au-Prince, while a tropical storm watch has been issued in Jamaica.

The Atlantic hurricane season lasts until Nov. 30.