Update (7:00 PM): Isolated storms have popped north of DC and Baltimore, closer to a stalled out frontal boundary near the MD/PA border. Other than that, coverage has been minimal to nonexistent for most of region, so we are reducing the chance of seeing storms this evening to 20%. That said, we can’t completely rule out an isolated storm or two with a burst of heavy rain developing closer to D.C. over the next few hours. All storms should die off rather quickly one we lose the sun for the day.
Humidity levels are quite uncomfortable this afternoon, with widespread dew point values in the 70s. Breaks in the cloud cover have allowed the sun to pop out, which will work to create an unstable wide air mass region as we move into the evening hours. Pop-up thunderstorms are possible anytime between now and just after sunset. Any storms that do develop will be slow-moving with pockets of torrential rain, raising the possibility of isolated flash flooding.
Through Tonight: A chance (60 percent) of thunderstorms this afternoon. Given the unstable air mass and high moisture values, the entire region is vulnerable to storms between now and about 10 p.m. Much like the past two days, flash flooding will be a concern as the storms will be slow-moving with heavy rain embedded. Otherwise, mostly cloudy and humid tonight with temperatures and dew points around 70 to 73 degrees.
View the current weather conditions at The Washington Post.
Tomorrow (Sunday): Clouds and fog/haze will be widespread in the morning before some drier air moves in, allowing for mostly sunny skies by the afternoon. More sunshine and a strong southerly flow (10 to 20 mph) will push temperatures back above 90 for most areas, with afternoon highs ranging from 88-92 degrees. Uncomfortable humidity levels once again with dew point values in the low 70s and a 40 percent chance of afternoon thunderstorms. Scattered storms tomorrow night with mostly cloudy skies and temperatures in the low 70s.
On the Severe Weather Watch for Monday: The ingredients will be in place for some severe weather in the Mid-Atlantic on Monday afternoon. The setup doesn’t look conducive to tornadic storms, but rather large, slow-moving storms that could feature strong straight-line winds and heavy rain. The rain may end up being the biggest issue here, with several areas already oversaturated from copious amounts of rain over the past 48 hours. Make sure to keep track of the forecast this weekend!
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