Hurricane Melissa has intensified into a Category 4 hurricane, and could develop further to become a Category 5 as it approaches Jamaica, according to the National Hurricane Center.

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.

Areas of Jamaica could “already be experiencing tropical storm force winds & heavy rains,” with conditions expected to “get much worse there through Monday and Tuesday,” the NHC said.