Tropical Storm Humberto is forecast to become a major hurricane this weekend and a second system — likely to become Imelda — is a possible threat to Florida or other parts of the U.S. coast.

A fast-moving Hurricane Gabrielle is expected to bring heavy rain, high winds and a storm surge to the Azores islands. The National Hurricane Center in Miami says a hurricane warning is in effect

Meanwhile, Tropical Storm Humberto is chugging along in the open Atlantic, where it’s expected to become a hurricane over the weekend and potentially a major hurricane early next week.