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Posted at 11:00 AM ET, 07/19/2010

Forecast: Summer stickiness and storms

By Jason Samenow

* Outside now? Radar, temps & more: Weather Wall | CWG on Twitter*
* Consec days of 90+: 5; Total 90+: 35 (Apr: 2; May: 3; Jun: 18; Jul: 12) *

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


A muggy Monday, but bumping the digit up a point given prospects for more needed rain.
Get the 'Digit' on Twitter


Today: Mostly cloudy, 40-50% chance of showers & t'storms. 88-93. | Tonight: Evening storms possible, then muggy. 72-78. | Tomorrow: Very warm and humid, t'storms possible in the p.m. 89-94. | A Look Ahead | Get Express Forecast by E-mail


Chances of thunderstorms will come and go this week and high temperatures will vary within about a 5-10 degree range, from the upper 80s to the upper 90s. The one constant though -- all week long -- will be the heinously high humidity. But wait, remember I'm not letting it bother me...

Radar & lightning: Latest D.C. area 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.

Today (Monday): Today offers the week's most promising chance for showers and thunderstorms with a slight chance (20-30%) of activity this morning, but better chances (40-50%) this afternoon. Prior to most of the storms, temperatures should reach into the low 90s under mostly cloudy skies. If the clouds thicken too much and too fast and/or showers develop during the peak heating hours (midday), there is slight chance we remain below 90. Confidence: Medium-High

Probability: 40-50%
Coverage: Scattered
Most likely timing: 12 p.m.- 6 p.m.

Tonight: Though not welcome news for "Screen on the Green" hopefuls, showers and storms remain a risk into the evening. But rain chances drop as the evening wears on so - so like last week, there's a chance the rain misses and the weather turns out o.k. After the storm threat passes, skies become partly cloudy with warm overnight lows from the low 70s in the cooler suburbs to the upper 70s downtown. Confidence: Medium-High

Think my daily digit rating is too generous? Vote in the Digit box above. And keep reading for the forecast through the weekend...

A downpour in Cleveland Park last night. By CWG photographer Ian Livingston.

Tomorrow (Tuesday): It's a second straight day with highs heading up into the low 90s. I'm actually a little more confident we surpass 90 tomorrow than today (though chances are good both days) simply because I envision less cloud cover. The humidity will be high as advertised before, and afternoon and evening thunderstorms are possible (20-30%) but with less coverage than today. The best chance of storms will be in northern Maryland and into Pennsylvania. Confidence: Medium-High

Tomorrow Night: A couple isolated storms could be around and about early, but then it's the usual partly cloudy and muggy with lows ranging from 73-78 (suburbs-city). Confidence: Medium-High


Wednesday's a virtual repeat of Tuesday and summer 2010: partly sunny, hot, and humid with a 30% chance of storms. Highs range from 90-95. Overnight: you guessed it...humid with lows 72-77 (suburbs-city). Confidence: Medium

Rain can be mostly removed from the forecast for Thursday and Friday as high pressure and sinking air probably suppresses most thunderstorm activity (though someone, somewhere could get an isolated t'shower). Still, it will be humid and with abundant sunshine- hot. Highs reach the mid-90s. Mostly clear skies overnight with lows 73-78. Confidence: Medium

Saturday and Sunday may deliver the week's hottest weather. Highs both days probably head up into the mid-to-upper 90s with some awfully high humidity. Some isolated storms may pop Saturday (20-30% chance) with more widespread storms possible Sunday (30-40% chance) as a front approaches. Confidence: Medium

By Jason Samenow  | July 19, 2010; 11:00 AM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Some Sunday evening storminess
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Last night's lightning/thunder show brought .60" rain in NE DC as of this morning. Pretty decent.


Posted by: jojo2008 | July 19, 2010 9:01 AM | Report abuse

Could be close on 90+ today if these showers/storms move in.

Posted by: Ian-CapitalWeatherGang | July 19, 2010 10:29 AM | Report abuse

Where are you in NE, jojo2008? We only had 0.21" in the rain gauges in Michigan Park. While I wish it had been significantly more, I'm grateful for every drop!

Posted by: TominMichiganParkDC | July 19, 2010 10:34 AM | Report abuse

May I request a Screen on the Green update as the hours go by today, or is there just not enough information to accurately predict whether moviegoers will get soaked?

Posted by: random-adam | July 19, 2010 10:39 AM | Report abuse

Possibly, but sunshine in July I have seen heat us back above 90F very quickly. Even at 4 or 5pm! :)

Posted by: Camden-CapitalWeatherGang | July 19, 2010 10:41 AM | Report abuse

TominMIpark, I am in a rowhouse a couple of blocks behind the S. Court. in NE.

Posted by: jojo2008 | July 19, 2010 11:03 AM | Report abuse

True Camden, the clouds look to go back west a bit though. Could kill most of the midday heating.

Posted by: Ian-CapitalWeatherGang | July 19, 2010 11:03 AM | Report abuse

random-adam, personal choice not to attend Screen tonight because, well, I expect the ground & grass to be annoyingly moist. This assumes rain likely prior to screening. Not including a moderate chance still for rain DURING the event? I don't see much hope :-/

Posted by: Camden-CapitalWeatherGang | July 19, 2010 11:35 AM | Report abuse

No precip. deficit around here--though last night's storm seems to have passed to our north. Now, these "dying" showers seem to be passing largely to our south--the clouds are keeping our temperatures down.

There seems to be some threat of rain EVERY DAY, dance nights or I said, hardly a drought.

Posted by: Bombo47jea | July 19, 2010 12:16 PM | Report abuse

Recommend a change to your headline: "Forecast - Disgusting Until Further Notice" :-)

Posted by: matthew_lawlor | July 19, 2010 12:44 PM | Report abuse

Threatening rain is not getting rain, no matter what the "much-needed-dance-crowd" seems to believe. Rain wouldn't hurt in my neighborhood....we have umbrellas and spare shoes.....

Posted by: ftwash | July 19, 2010 1:03 PM | Report abuse

Is the dewpoint actually 106 or does it just feel that way?

Posted by: authorofpoetry | July 19, 2010 1:35 PM | Report abuse

Clouds broke nicely. We hit 90 already at some point.. heat wave breaking crisis cancel.

Posted by: Ian-CapitalWeatherGang | July 19, 2010 2:02 PM | Report abuse


Your best bet is to check our PM Update around 3:30 which will have updated info on rain chances. Then - check the radar before you head out (or don't head out) to see where the rain is and where it's moving.

Posted by: CapitalWeatherGang | July 19, 2010 2:24 PM | Report abuse

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