Baltimore, Maryland – Dangerous heat and a growing threat of flash flooding will grip much of Maryland and the D.C. region through Wednesday evening, with heat index values soaring to 107 degrees and strong storms expected by late afternoon.
According to the National Weather Service Baltimore/Washington office, a Heat Advisory remains in effect until 7 p.m. for most of central and western Maryland, D.C., and parts of northern Virginia. The combination of temperatures in the 90s and high humidity will make it feel significantly hotter, increasing the risk of heat-related illness for anyone without adequate cooling.
A slight risk of flash flooding also exists across the I-95 corridor from Gaithersburg to Alexandria, particularly in urban and metro areas where slow-moving thunderstorms could drop heavy rainfall in a short time. Some storms may also bring damaging wind gusts.
In Frederick, Hagerstown, and Annapolis, residents are urged to limit outdoor activity, stay hydrated, and avoid low-lying roads during downpours. Schools and summer camps across Montgomery and Prince George’s counties have issued early dismissal notices due to extreme heat.
Warnings could extend into Thursday if storms stall or new convection develops overnight.
