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Humidity to Build Over The Weekend
Slight t'storm risk on Sunday

Jason Samenow @ 12:15 AM

A fairly characteristic mid-summer weekend is on tap with seasonably hot conditions. The one notable feature will be the gradually increasing humidity levels.


Forecast Confidence: High-Very HighMostly sunny and hot. Mostly sunny skies, hot air and tolerable levels of humidity will be the story today. The high temperature should be around 90 degrees. Winds will be southwesterly between 10-15mph. Overnight, skies will be mostly clear, and it will gradually become more muggy with low temperatures from the mid 60s in the suburbs to near 70 downtown.


Forecast Confidence: HighPartly cloudy, very warm and humid. The 72 hour window of comfortably dry air Josh spoke of Thursday will be history, as a moist tropical airmass sets in. High temperatures will be in the low 90s but it will feel like the mid 90s factoring in the humidity. Afternoon cloud cover will likely increase and some scattered thunderstorms are possible (30% chance) as a cold front approaches.

Dry Conditions: Any relief?

Our rainfall deficit for the year is currently over 4" at Reagan National and over 7" at Dulles Airport. Accordingly, our area is in a moderate drought according to the U.S. Drought Monitor. The good news is that the cold front that will approach the area late Sunday is likely to stall and not clear the region until late next week. While it hangs around, it will serve as a focusing mechanism for scattered afternoon and evening thunderstorms each afternoon and evening. The bad news is that because of the localized nature of storms, not everyone will see rain. We could actually use the remnants of a tropical system to put a dent in the drought. Alas, all is quiet in the tropics for the time being...

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