Several organizations have organized relief efforts after the Caribbean was hit by one of the strongest Atlantic storms on record.

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.

Up to 40 inches of rain, 13 feet of storm surge and 160 mph sustained winds will cause “extensive infrastructure damage” that will cut off communities, the National Hurricane Center warned. Melissa has already killed three people in Haiti and Jamaica each and one person in the Dominican Republic.