Maryland Heat Emergency: 105°F Heat Index and Thunderstorm Threats Through Wednesday, July 30

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Washington, DC – Maryland, northern Virginia, and the District are under a dangerous stretch of hot and humid weather, with heat index values climbing as high as 109°F through Wednesday. Heat Advisories cover much of the Chesapeake Bay, Tidal Potomac, and the I-95 corridor, posing risks for heat-related illnesses and straining local infrastructure.

According to the National Weather Service in Baltimore/Washington, a Heat Advisory remains in effect from 11 a.m. to 8 p.m. Friday, as temperatures across DC, Baltimore, and Prince George’s County soar into the upper 90s. Isolated severe thunderstorms are possible each afternoon and evening, with a higher risk of damaging winds and brief downpours from Saturday through Monday. Flash flooding could impact areas like Arlington, Fairfax, and southern Maryland Sunday afternoon.

Residents should limit outdoor activities, drink extra water, and check on vulnerable neighbors. Air conditioning, fans, and cool shelters are strongly advised. Drivers are urged to watch for hydroplaning and rapidly changing road conditions, especially on I-95 and near the Patapsco River and Tidal Potomac. Utility outages may occur during storms.

This heat wave marks the hottest stretch of the year so far, with highs approaching or topping 100°F in DC, Alexandria, and Baltimore by Wednesday. The National Weather Service warns that more advisories and updates are likely as conditions evolve.

Next update: Additional warnings may be issued if flash flooding or severe storms increase over the weekend. Stay tuned for local emergency alerts.


Five Day Bullet Point Forecast

  • Saturday: Highs near 95°F. Heat index up to 103. Scattered afternoon storms, some severe.
  • Sunday: High 94°F, heat index as high as 103. Thunderstorms likely after 2 p.m., risk of flash flooding.
  • Monday: Mostly sunny, high near 95°F. Isolated afternoon storms possible.
  • Tuesday: Sunny and dangerously hot, high 99°F.
  • Wednesday: High 100°F. Mostly sunny and humid, risk of late-day storms.

Stay weather-aware and take precautions during this extended period of dangerous heat and severe weather.