The system has already brought 0.5 to 1.5 inches of rain to the Washington area. Strong thunderstorms and an isolated tornado are possible Sunday evening, especially south of the city, though storms are not certain to develop, Capital Weather Gang reported.
Four people died after Isaias struck near Destin, Florida, late Friday as a Category 2 hurricane with sustained winds of 105 mph. Nearly 600,000 customers in Alabama, Florida and Georgia remained without power early Sunday, down from nearly 900,000 reported Saturday.