D.C. area forecast: Warm with showers/storms today before nice Wednesday through Friday

August 13, 2013

Today’s Daily Digit

A somewhat subjective rating of the days weather, on a scale of 1 to 10.

4
What makes this day even worse is knowing how much better the balance of week will be!

Express Forecast

Today: Mostly cloudy. Showers and storms likely. Highs: 84-88.

Tonight: Possible evening showers, then clearing, cooler overnight. Lows: 60-66.

Tomorrow: Mostly sunny, low humidity. Highs: 78-83.

FORECAST IN DETAIL


Radar & lightning: Latest regional radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Our next round of Canadian-born natural air conditioning is trucking our way with an expected arrival tomorrow, and it plans to pleasantly stay through the balance of this work week.  Before we get there though, we have showers and storms today, some heavy. A number of areas need the rain, especially since the next opportunity won’t be until later this weekend.  But the ensuing low humidity, cool breezes, and reduced energy demand should offer yet another pleasant taste of early autumn conditions.

Today (Tuesday):  Showers and storms – some with heavy downpours – may be widespread this morning (70% likelihood) with more scattered activity (40% likelihood) this afternoon.  Under mostly cloudy skies, highs move back up into the middle to maybe upper 80s, which is not as hot as yesterday, but still carrying some moderate to high humidity levels to add to the discomfort.

Rainfall amounts are in keeping with their summertime nature – wildly varying.  Many areas should manage between .1″ and .25″, but some spots could pick up a half or even an inch or more of rain with heavier downpours.  Winds are from the southwest ahead of the cool front at 5-10 mph. Confidence: Medium

Tonight: We still have a 30% chance of scattered showers and maybe an isolated thunderstorm especially this evening before clouds begin to clear late at night.  Temperatures begin the cooling process, allowing the outer suburbs to reach down to near 60, while the city holds closer to the middle 60s or so.  Light winds start coming from the northwest to deliver our refreshingly cooler air mass. Confidence: Medium

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend…

Tomorrow (Wednesday):  This is the first great day of the Canadian air mass trilogy with mostly sunny skies, comfortably low humidity, and more-than-tolerable temperatures in the upper 70s to low 80s.  Light breezes come from the north and northwest. Confidence: Medium-High

Tomorrow night:  Wow, the air conditioners can take another breather as our local area temperatures drop as low as the middle 50s out near Dulles to the low 60s in the city.  It actually may be too cool for the windows to be open in the outer suburbs!  Imagine that.  Light winds continue to deliver cool air from the northerly direction. Confidence: Medium-High

A LOOK AHEAD

Thursday and Friday are two more Nice Day qualifiers with mostly sunny skies, comfortable temperatures in the upper 70s to low 80s, and very low humidity.  Thursday night may not be quite as cool as Wednesday night, but lows should get down to the upper 50s to low to middle 60s.  A few extra clouds could sneak in on Friday afternoon into evening.  Friday night is looking partly cloudy with lows in the 60s. Confidence: Medium-High

The weekend looks a bit murkier right now with partly cloudy skies on Saturday, slightly higher humidity (but still on the low side yet at least) and a 30% chance of showers by afternoon, especially in the southern half of the area.  Odds increase to 40% Saturday night under partly cloudy skies and lows in the 60s.  Sunday looks wetter right now (60% risk of showers/storms) as a disturbance may move up from the south.   Highs in the low to middle 80s with low to moderate humidity levels. Confidence: Low-Medium

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Matt Rogers · August 13, 2013