D.C. area forecast: Still hot, still humid. Will storms break the heat?

*Heat advisory noon until 8 p.m. for D.C. and generally I-95 and east*

9:00 a.m. update: A patch of clouds has moved over the area so far this morning. They should tend to clear heading through the midday.

Today’s Daily Digit

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

4
Not quite as oppressive, but storm chances go up in return. Still a day to take it easy outdoors.

Express Forecast

Today: Partly cloudy. Late-day showers and storms. Highs: 92-97.

Tonight: Evening showers or storms possible, then partly cloudy. Lows: Near 70 to mid-70s.

Tomorrow: Partly cloudy. Showers and storms possible. Highs: Upper 80s to low 90s.

FORECAST IN DETAIL

Temperature Map

Temperatures: Latest D.C. area temperature map. See interactive map on our Weather Wall.

Despite only reaching a temperature of 97 so far in this streak of heat, our current run of five days straight 95+ occurs in only about 15 percent of D.C. summers. Add in the record 4 calendar days of lows 80 or higher (now tied for 2011 for the most in a row), and it’s no heat/humidity wave to snicker at. We may not see a whole lot of big relief ahead, but the 80+ temperature streak should come to a conclusion sooner rather than later.

Today (Saturday): It’s another hot one, with partly cloudy skies in the morning generally turning cloudier as the day wears on. A front pushing into the region should help focus more storm activity (60% chance) than the recent days featuring isolated pop ups.

It may not be uniform coverage, but any storm could contain heavy rain, lots of lightning, and perhaps isolated damaging winds. Highs reach the low-and-mid 90s most spots, but southwest winds up to 15 mph, with higher gusts, may help this one overachieve on warmth. Confidence: Medium

Tonight: Scattered showers and thunderstorms remain likely into the evening, but the threat wanes as we lose the heating of the sun. Overnight, skies are partly cloudy. We might see a little relief in overnight lows, yet nothing fantastic. Plan on readings near 70 in the ‘cold’ spots to the mid-or-upper 70s downtown. Confidence: Medium-High

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

Tomorrow (Sunday): The front gets hung up in the area, so we don’t benefit too much on the heat and humidity end, and storms remain a decent bet during the afternoon into evening. It is “cooler,” which is all relative at this time of year, but I’ll take highs in the upper 80s to low 90s instead of mid-90s! Winds are light and variable. Confidence: Medium

Tomorrow night: Showers or storms could still be around in the evening, but as usual they want to head to bed like the rest of us as it gets late. Partly cloudy skies and light winds promote a little cooling, with lows in the near 70 to mid-70s range. Confidence: Medium-High

A LOOK AHEAD

On Monday, the front is mostly washed out though the upper-level jet stream remains somewhat close by. This allows the atmosphere to remain ready for some showers and storms (50% chance) of the late-day variety. Before that, it’s partly cloudy, with highs focused around 90, give or take a few.
Confidence: Medium

By Tuesday, we probably remember we’re stuck in a rut called July. Partly cloudy skies may again give way to some showers and storms during the day. Highs could actually be a tad higher once again, with near 90 to the low 90s favored overall. Confidence: Medium

Ian Livingston is a forecaster/photographer and information lead for the Capital Weather Gang. By day, Ian is a defense and national security researcher at a D.C. think tank.
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Ian Livingston · July 20, 2013