Hurricane Melissa is edging toward Jamaica and is set to make landfall as a historic Category 5 storm, with winds of more than 170 mph. Jamaica is bracing for what the National Hurricane Center said would be catastrophic flash flooding and landslides caused by up to 40 inches of rain in some places. The storm is due to make landfall early tomorrow.

With peak sustained winds of 180 mph and even higher gusts, Hurricane Melissa is forecast to be the strongest storm ever to strike Jamaica.

Haiti is expected to see catastrophic flash floods and landslides early next week causing “extensive infrastructural damage and potentially prolonged isolation of communities.” The southwestern peninsula of Haiti, from the border of the Dominican Republic to Port-au-Prince, was placed under a hurricane watch and a tropical-storm warning.