Capital Weather Gang from The Washington Post

Daily forecast for the Washington area

D.C.-area forecast: Heat wave rolls on today; could be incredibly hot tomorrow

* Code orange air-quality alert for Sunday: Unhealthy for sensitive groups *

A hot start yesterday to a hot weekend in D.C. (Jim Havard via Flickr)

TODAY’S DAILY DIGIT
A somewhat subjective rating of the day’s weather, on a scale of 0 to 10.

3/10: Believe it or not, mid-to-upper 90s and moderate humidity may rank a couple points higher than what’s coming Monday.

EXPRESS FORECAST

Today: Slightly less humid, still very hot. Highs: Mid-to-upper 90s.
Tonight: Increasing humidity, t’storm north?. Lows: 75-82.
Tomorrow: Extremely hot and humid, chance of PM storms. Highs: Near 100.

View the current weather conditions at The Washington Post headquarters.

FORECAST IN DETAIL

It’s still very hot mind you, just not quite as brutal as yesterday, with slightly lower humidity. The chance to see 100 comes back tomorrow, as does the chance for a few late-day storms, which would truly be welcome refreshment. Our stretch of mid-90s or higher is likely to continue into midweek, with a weak front bringing the potential for a few storms each day.

Today (Sunday): We remain hazy, hot, and still fairly humid, just not quite as oppressive as yesterday. The sun relents only briefly behind a few afternoon clouds, as highs reach the mid-to-upper 90s, with the afternoon heat index into the upper 90s to low 100s. Like yesterday, you’ll want to avoid much time outside, unless you’re in a pool. Thunderstorm chances are slim to none in metro area. Confidence: High

Tonight: The brief respite in the truly oppressive humidity is short-lived, as a wind from the south sends dew points rising in to the low-to-mid 70s during the evening and overnight. Just a slight chance of a thunderstorm, mainly north of D.C., as a disturbance scoots through southern Pennsylvania. Otherwise, scattered clouds dot the sky as temperatures spend much of the night in the 80s, perhaps briefly dropping into the mid-to-upper 70s for late-night lows. Confidence: Medium-High

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Tomorrow (Monday): Triple digits are in play as temperatures crack into the low 90s by lunchtime, and reach afternoon highs in the mid-90s to low 100s under partly sunny skies. How many spots hit or top 100 depends on how many clouds a weak front is able to create. Regardless, oppressive humidity should push the afternoon heat index to around 105-110, maybe even a little higher. The front may spark some afternoon into evening storms (30-40% chance) as it approaches from the northwest. Winds are from the south-southwest around 5-10 mph. Confidence: Medium-High

Tomorrow night: Any evening storms (30-40% chance) wane overnight, leaving partly to mostly cloudy skies through morning. Any areas that do get rain could see some overnight fog, as lows only get down to the upper 70s to near 80. Confidence: Medium-High

A LOOK AHEAD

Stop me if you’ve heard this one before, but, we continue hot through Tuesday and Wednesday. Probably not quite as hot as Monday, but highs still head for the mid-90s both days with high humidity. With the frontal boundary still nearby, we’ll hold onto a 30% chance of a few afternoon showers and thunderstorms each day. Tuesday night offers little relief, with lows in the mid-70s to near 80. Confidence: Medium-High

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