‘Heat Dome’ Shatters, Ushering In Wet, Stormy Weekend In MD: See Forecast, Timing

Cooler temperatures swept across Maryland on Friday, shattering the "heat dome" that baked the state most of this week and serving as a harbinger of wet weather to start the weekend.

"A backdoor cold front will stall out over the area today," National Weather Service forecasters said. "Thick low clouds are expected as a result, along with much cooler temperatures. High temperatures will only make it into the upper 70s and lower 80s for most."

Moderate to heavy showers south and west of D.C. should become lighter by midafternoon, according to the Capital Weather Gang's latest forecast, with an occasional light shower and some mist possible anywhere through afternoon.

Isolated showers or thunderstorms are possible through the evening and overnight hours, forecasters said.

The cooler temperatures will be short-lived, however, as the heat returns Saturday. High temperatures are likely to reach 90 degrees, and humidity could set off thunderstorms in the afternoon and evening hours. A few storms could be severe, with winds of 50 to 60 mph and flooding downpours.

Showers and thunderstorms may be possible again on Sunday, the NWS said, but coverage looks to be lower compared to Saturday. Temperatures will be warm once again, with highs in the lower 90s.

Here's a look at the detailed NWS forecast for the Baltimore area:

Friday: Isolated showers, with thunderstorms also possible after 5pm. Patchy fog before 3pm. Otherwise, cloudy, with a high near 73. East wind around 9 mph. Chance of precipitation is 20%.

Friday Night: Scattered showers and thunderstorms. Patchy fog after 7pm. Otherwise, cloudy, with a low around 71. East wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 30%.

Saturday: A chance of showers before 8am, then a slight chance of showers and thunderstorms after 3pm. Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 91. Heat index values as high as 101. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 30%.

Saturday Night: A chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

Sunday: Sunny, with a high near 91. Northwest wind 3 to 5 mph.

Sunday Night: Partly cloudy, with a low around 73.

Monday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 60%.

Monday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 75. Chance of precipitation is 60%.

Tuesday: Showers and possibly a thunderstorm, mainly after 2pm. High near 89. Chance of precipitation is 80%.

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Patch editor Veronica Flesher contributed reporting.