Here are 7 maps showing how Hurricane Irma is growing into a Category 4 storm -- and could get larger
Hurricane Irma is a Category 3 storm.

Hurricane Irma may reach Category 4 status tonight as long-range models continue to show the storm threatening the eastern seaboard.

"Irma is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale," the National Hurricane Center explained. Maximum sustained winds are 120 miles per hour.

Different models diverge widely on where the hurricane may strike landfall -- a reminder of the unreliability of forecasting this far out.