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Cold Front To Push Out Heat & Humidity
Weekend Continues to Look Pleasant

Josh Larson @ 2:30 PM

*Severe Thunderstorm Watch in Effect until 10pm*

As Jason suggested in yesterday's post "steamy" and "stormy" is the best way to describe today's weather, as a cold front approaches from the west. After the front's passage, temperatures will drop some 10 degrees for Friday and conditions will remain pleasant all weekend. Heat builds once again by early next week, however.


Forecast Confidence: MediumSteamy & Stormy. We'll experience extreme heat and humidity today, with high temperatures ranging from 90-95 along with heat indices approaching 100 due to very high dew points. Scattered showers and thunderstorms (some of which may reach severe levels) will develop during the afternoon hours and may continue, sporadically, into the overnight hours; sticky overnight lows will be near 75.

A colorful sunrise near Dulles Airport Tuesday morning; captured by CapitalWeather photographer Kevin Ambrose.


Forecast Confidence: MediumBecoming much nicer. Though clouds and a stray shower may linger into the early morning hours, skies should begin to clear rapidly by mid to late morning. The afternoon will be mostly sunny with much more comfortable afternoon highs in the mid 80s along with delightfully reduced humidity levels. Mostly clear and comfortable overnight, with lows in the mid 60s.

The Weekend

Confidence: High-Very HighDelightful! Expect abnormally nice weather this weekend for late July, with cooler than normal temperatures and humidity levels. Both days will feature partly to mostly sunny skies with highs on Saturday in the low 80s and into the mid 80s on Sunday. Overnight conditions will be mostly clear and comfortable with lows primarily in the mid 60s.

Pattern Overview

A strong cold front (associated with a fairly sharp trough aloft) will push through the region early on Friday, bringing with it much more comfortable heat and humidity levels for Friday thorough the weekend. In fact, with high pressure firmly under control Saturday and Sunday, temperatures will actually be several degrees cooler than normal for this time of year. However, as is the case for late July, temperatures above 90 degrees will build back in by Tuesday of next week. In fact, there are some suggestions we may flirt with the 100 degree mark by Thursday or Friday.

Pictured above: the GFS model shows a rather sharp trough (at 300mb) early on Friday morning; its associated cold front will bring much nicer weather for this coming weekend. Image courtesy


Next week's forecast
Forecast highs/lows: 93/74 (normal = 89/71)
Forecast precip: Below-normal

Forecast Confidence: High-Very HighConditions for Monday will still be rather nice, with mostly sunny skies, comfortable humidity levels, and highs in the upper 80s along with overnight lows in the upper 60s. Heat and humidity increases on Tuesday with high temperatures likely eclipsing the 90 degree mark and uncomfortable overnight lows in the low to mid 70s. Similar conditions can be expected on Wednesday with a blend of clouds and sun and highs in the lower 90s. From this far vantage point, Thursday and Friday look oppressively hot and humid, with a blend of clouds and sun, slight chances for scattered afternoon or evening thunderstorms each day, and highs from 95-100 with overnight lows in the mid to upper 70s.

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