Humidity returns with storm chances by tomorrow and Thursday
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With the holiday weekend behind us and the two hottest months of summer essentially in front of us, we could certainly do far worse than the weather expected this week around the Washington, D.C. area. A very weak, stalled frontal system currently to our south lifts north tomorrow to change our wind direction and humidity levels. Right now, tomorrow through Friday should be our more humid days with today and at least part of the weekend on the drier side. The upside of humidity is that it increases chances of afternoon/evening thunderstorms. And we still need rain.
Today (Tuesday): High pressure is working in overhead to deliver sunny skies and lower humidity. A front stalled to our south means humidity and thunderstorms mainly from around Richmond and southward. Mostly sunny skies today with highs in the upper 80s to around 90. Light winds from the north. Confidence: High
Tonight: A few clouds and light winds with lows in the mid-to-upper 60s to some low 70s inside the urban heat island. Confidence: High
Keep reading for the forecast through the weekend...
Tomorrow (Wednesday): The lurking front to our south shifts north for about a two-day visit with partly sunny skies, moderate humidity levels, and afternoon to evening thunderstorm chances (about 40%, especially southern areas). Highs in the upper 80s to around 90 (but heat indices that could reach into the middle 90s at times) with light winds from the south. Confidence: Medium-High
Tomorrow night: Scattered evening thundersorms (30% chance) and muggy with lows ranging from the upper 60s in the suburbs to the low-to-mid 70s in the city. Partly cloudy skies. Confidence: Medium-High
Thursday should look a lot like Wednesday with partly cloudy skies, moderate humidity, and afternoon-to-evening thunderstorms (30% chance) again. We could use the rain, and with these moderate humidity levels, there could be scattered heavier downpours. Scattered storms Thursday evening and maybe even overnight with lows in the mid-to-upper 60s to low 70s again. Confidence: Medium
Friday features a cold front slowly moving through the area. Highs should be in the mid-to-upper 80s under partly cloudy skies with scattered afternoon to evening thunderstorms (40% chance). The cold front may push through early enough on Friday to give us a humidity and storm break by Friday night. Partly cloudy skies are expected with lows ranging from the low 60s in the outer ‘burbs to near 70 in the city. Confidence: Low-Medium
The weekend is looking just a bit tricky right now, but the best thinking is that we should see a humidity break on Saturday with partly sunny to mostly sunny skies and temperatures in the mid-to-upper 80s or around 90. If that pesky cold front lingers longer, the temperatures may not be much different but we’d be more humid with more storms again. Saturday night should be more of those mid-to-upper 60s to around 70 for lows. By Sunday, we should be taking a break fromstorm chances with partly to mostly sunny skies and highs in the upper 80s to maybe low 90s. There are hints of a stronger heat burst early next week in the Mid-Atlantic. Confidence: Low-Medium.