Hurricane Melissa is currently undergoing "extreme rapid intensification," according to the National Hurricane Center, increasing by more than 55 mph in 24 hours.

Tropical Storm Melissa has strengthened into a hurricane and is expected to become a major hurricane by the end of the weekend, the U.S. National Hurricane Center said on Saturday.

It’s expected to drift west slowly in the coming days, likely intensifying into a hurricane on Saturday and continuing to unleash destructive winds and torrential rain over Haiti and also the Dominica...