 Residents seeking relief to the 14 cooling centers can also visit the Pratt Library locations. An excessive heat warning will be in effect from 11 o'clock this morning until 8 o'clock this evening for the I-95 corridor, southern Maryland, parts of the eastern shore, Washington County. Rest of the state will be under a heat advisory. Baltimore City remains under a Code Red extreme alert. National Weather Service has also issued an extreme heat warning for Hagerstown.