Thundery weather at times tonight thru weekend

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Heat advisory noon to 8 p.m. | Code orange air quality

Today’s Daily Digit
A somewhat subjective rating of the
day’s weather, on a scale of 0 to 10.

Not much different than yesterday but I knock it down another point for being unimaginative. Bring on the weekend and something new.
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Today: Hot and humid; chance of late day storm. 96-100. | Tonight: Scattered thunderstorms. 67-75. | Tomorrow: Slowly increasing clouds, p.m. t-showers. 90-94. | Get Express Forecast by E-mail


Today marks the end of our two day bout with record or near record heat. I can hardly wait for tonight on into the weekend. Not for the incremental drop in heat, but for the chance for some rain! We are coming perilously close to drought status and yards are starting to take on that crispy summer look. There is a good chance for thundershowers at times this weekend but plenty of time to enjoy the outdoors too. Just be ready to bolt indoors as storms could pop up most anytime. Sunday finally starts improving on the humidity front but only on Monday does the weather rate a “nice day.”Anyone for an extended weekend?

Temperatures: Latest D.C. area temperature map powered by iMapWeather (base map by Google). Click and hold on map to pan. Double-click to zoom. Refresh page to update. See larger map on our Weather Wall.

Today (Thursday): The sun pounds down on the area today and humidity levels hold stubbornly steady. Temperatures rapidly jump up to the 90s and most peak in the upper 90s with a 100 degree reading here and there likely. A light breeze from the west at 5-10 mph is not much help today. Clouds will start to boil up later in the afternoon but most thundershowers should stay in the mountains far to the west. There is a 20% chance for any storms to make it into the region (30% western suburbs) before the evening commute. Today’s records: Reagan National, 102 (1874); Dulles, 96 (1999); BWI 98 (1933). Confidence: High

Probability: 50-60%
Coverage: Scattered
Most Likely Timing: 5 p.m. to midnight

Tonight: This evening starts out sultry with readings still well up in the 80s and barely a breath of breeze. What is really interesting is that one of the main computer models has been advertising some notable downpours this evening all week. I would not be surprised to see just such an event cover as much as half the area. The storms are likely to be slow movers so brief localized street flooding is a possibility. The areas getting showers should see temperatures zip down to the 70s. The rest of us will have to wait until late night when lows reach the upper 60s to mid-70s (downtown). Confidence: Medium

Keep reading for the forecast through the weekend...

Tomorrow (Friday): Skies clear by daybreak and we start the whole process over again. Don’t look now but a “cold front” has sagged into the area. But it hasn’t made a strong enough push to kick out the humidity, which remains in good supply. Breezes at 5 to 10 mph from the north are the main indicator of a change. Clouds should start building quickly in the afternoon with a 60% chance of thundershowers. Some of these storms should be capable of strong gusty winds and heavy downpours. Highs should make the low-to-mid 90s before storms knock them down. Confidence: Medium

Tomorrow night: Thundershowers are still likely well into the evening and the 60% chance holds strong. Most areas should have more comfortable readings whether rains actually fall or not. Evening readings are likely to be mainly in the 70s as a result. The problem is the humid air goes nowhere and overnight lows only slip to the upper 60s to lower 70s (downtown). Confidence: Medium


Saturday skies should have more residual clouds around from the prior evening’s fireworks. However, our sun angle is now practically at its peak for the year and that should be enough to push readings into the mid-to-upper 80s. That should support some spotty afternoon thundershowers that are likely to come down from a storm up in the Great Lakes. However, the main thunderstorms are likely to occur overnight as a more potent cool front heads through the area, giving us a 60% chance of rains. Lows should hold up in the mid-to-upper 60s. Confidence: Medium

Sunday “should” see the thundershowers focus to the east harrassing mainly the beach crowds. But I have to keep a 20% chance of some showers in the forecast until the front is safely to our south (timing is a little uncertain). By evening (or earlier), breezes from the northwest mean business and slowly but surely start to ratchet down the humidity levels. Once again, that high in the sky sun pushes readings into the mid-to-upper 80s. Temperatures quickly fall to the 70s in the evening and encourage an evening stroll for the first time in nearly a week. Lows bottom out in the 60s. Confidence: Medium

Monday is perfect but for the small detail that most of us are going back to work. Humidity levels are on the low side. Highs are manageable in the low-to-mid 80s under sun-drenched skies. Confidence: Medium-High