CWG Live updates: Serious flooding possible in storms later today

Washington Post

2 days ago

Welcome to cwg.live, updated around-the-clock by Capital Weather Gang meteorologists.
Happening now: Another muggy morning as the chance for showers and storms increases into the afternoon and evening, when a flood watch takes effect. The National Weather Service warns 'significant' flash flooding is possible.
What's next? Something absolutely awesome: While lingering showers are possible Friday, humidity and temperatures start to fall. By the weekend, we enjoy partly to mostly sunny skies, low humidity and very comfortable temperatures.
Today's daily digit — 3/10: Heavy storms and possible flooding later today could be quite disruptive even if more clouds mean it's not as hot. | 🤚 Your call?
The digit is a somewhat subjective rating of the day's weather, on a 0-to-10 scale.
Forecast in detail
Today (Thursday): Prepare to say goodbye to both July and this recent mini heat wave as increasing clouds cap highs in the upper 80s to low 90s. It's still very humid with showers and storms possible any time, but most likely in the afternoon and evening. Some storms could produce damaging wind gusts, but the potential for torrential rain and flooding is the greater concern. The heaviest storms could produce 1 to 2 inches of rain in just 30 minutes. Winds from the south are generally light, but gustier around storms. Confidence: Medium
Tonight: Heavy evening storms are possible, while some scattered showers could linger overnight under mostly cloudy skies. Lows settle in the upper 60s and low 70s. Mostly light winds shift to come from the north late at night. Confidence: Medium
Tomorrow (Friday): The cool front is not in a super hurry to sweep through, so it continues on the cloudy side with scattered showers around, especially in the morning. Highs in the mid- to upper 70s make this the coolest day since late June! Light winds from the north at 10 to 15 mph slowly draw in less humid air. Confidence: Medium
Tomorrow night: Partly cloudy, cooler and more comfortable with lows by dawn in the upper 50s (!) to mid-60s. Confidence: Medium
A look ahead
The weekend into Monday fares fantastically with mostly sunny skies, highs in the low to mid-80s, and also — drum roll, please — low humidity (dew points in the 50s). Saturday and Sunday nights should feature mostly clear skies with lows in the upper 50s in our cooler areas and 60s elsewhere. Confidence: Medium-High
The rest of next week starts to slowly reheat with highs in the upper 80s to near 90, while humidity builds back to more typical early-August levels. Thunderstorm chances also return Wednesday onward.
Jason Samenow contributed to this forecast.
Today's daily digit — 3/10: Heavy storms and possible flooding later today could be quite disruptive even if more clouds mean it's not as hot. | 🤚 Your call?
The digit is a somewhat subjective rating of the day's weather, on a 0-to-10 scale.
Forecast in detail
Today (Thursday): Prepare to say goodbye to both July and this recent mini heat wave as increasing clouds cap highs in the upper 80s to low 90s. It's still very humid with showers and storms possible any time, but most likely in the afternoon and evening. Some storms could produce damaging wind gusts, but the potential for torrential rain and flooding is the greater concern. The heaviest storms could produce 1 to 2 inches of rain in just 30 minutes. Winds from the south are generally light, but gustier around storms. Confidence: Medium
Tonight: Heavy evening storms are possible, while some scattered showers could linger overnight under mostly cloudy skies. Lows settle in the upper 60s and low 70s. Mostly light winds shift to come from the north late at night. Confidence: Medium
Tomorrow (Friday): The cool front is not in a super hurry to sweep through, so it continues on the cloudy side with scattered showers around, especially in the morning. Highs in the mid- to upper 70s make this the coolest day since late June! Light winds from the north at 10 to 15 mph slowly draw in less humid air. Confidence: Medium
Tomorrow night: Partly cloudy, cooler and more comfortable with lows by dawn in the upper 50s (!) to mid-60s. Confidence: Medium
A look ahead
The weekend into Monday fares fantastically with mostly sunny skies, highs in the low to mid-80s, and also — drum roll, please — low humidity (dew points in the 50s). Saturday and Sunday nights should feature mostly clear skies with lows in the upper 50s in our cooler areas and 60s elsewhere. Confidence: Medium-High
The rest of next week starts to slowly reheat with highs in the upper 80s to near 90, while humidity builds back to more typical early-August levels. Thunderstorm chances also return Wednesday onward.
Jason Samenow contributed to this forecast.