The storm is due to make landfall early Tuesday.

Hurricane Melissa has developed into a Category 4 hurricane, the U.S. National Hurricane Center (NHC) said on Sunday, adding that the maximum sustained winds have increased to 140 mph (220 km/h).

Portions of the island have already been doused with more than a foot of rain during Melissa’s approach, and forecasters said up to 30 more inches could be on the way.