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Posted at 9:30 AM ET, 08/12/2010

Forecast: Morning storms gone; more to come?

By David Streit

A milder weekend with small t'shower threat

*** Storm impacts, power outages & more: ***

* Earlier storm updates & tweets | Sunrise on the Mall *
* Outside now? Radar, temps & more: Weather Wall | NatCast *

updated at 9:30 a.m.; originally posted at 5 a.m.

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


If the t'showers green our grass, exit midday and lower temps, the afternoon might be a 5!
Get the 'Digit' on Twitter


Today: Muggy. Chance of t'storms. Upper 80s. | Tonight: Chance of t'storms. 69-73. | Tomorrow: Mostly cloudy, slight shower chance. 82-86. | A Look Ahead | Get Express Forecast by E-mail


By David Streit, CWG Meteorologist

This morning's storms were nasty and the humidity is going nowhere. But at least the storms have helped to take the edge off the heat today. Temperatures much closer to average than we've seen are expected through the forecast period, which means no more of those upper 90s and near 100 readings that have plagued us much of the summer, at least for the time being. However, near 90 or low 90s is still within reach at times.

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.

Today (Thursday): The morning thunderstorms and light onshore breezes help lower temperatures today to highs around the upper 80s with partly sunny skies -- though it will be quite humid. We have another chance of showers and thunderstorms come afternoon or evening (around 40%). A couple stronger storms could develop with these and produce some gusty winds. Confidence: Medium

Tonight: Clouds dominate and some showers or storms may be around during the evening (40% chance). Readings in the mid-to-upper 70s are easy to take. Lows hold in the upper 60s and lower 70s. Confidence: Medium

Keep reading for the forecast through Monday....

Tomorrow (Friday): Stubborn clouds dominate at least the first half of the day with more breaks likely by afternoon. A shower in the morning hours is only a 20% chance or so. Slow rising temperatures and cloud-provided shade make this a much better day to be out and about though the humidity is only marginally diminished. Highs make the low-to-mid 80s in most locations. Breezes remain light from the east. AConfidence: Medium

Tomorrow Night: Temperatures slowly fall through the lower 80s and into the upper 70s for the evening hours. Abundant clouds do not add up to more than an isolated shower (10-20% chance). Lows end up in the upper 60s to lower 70s downtown. Confidence: Medium


Saturday is about as seasonable as can be. Readings move through the 70s in the morning and hit mid-to-upper 80s in the afternoon. Partly sunny skies should just bring a very slight threat of showers while offering some occasional shade. The evening is tranquil with readings in the lower 80s and a touch of humidity. Confidence: Medium

Sunday starts out decent with readings in the 70s, but all good things come to an end as breezes from the south push highs to near 90 in much of the area. The heat up sets the stage for pop up afternoon thundershowers but only in about 30% of the area. The rest of the region has to wait for the setting sun to cool things back down. Confidence: Low-Medium

A cold front approaches Monday and in advance of it comes rising humidity and increasing clouds. Temperatures are still apt to make the mid-to-upper 80s as this front is likely to just tease and never really come through. What it will do is serve as a boundary for quite a few thundershowers in the afternoon and evening. Look for much of the area (60%) to pick up measurable amounts with the frequent showers. Confidence: Low-Medium

By David Streit  | August 12, 2010; 9:30 AM ET
Categories:  Forecasts  
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Next: Where did wild morning storms come from?


Unfortunately, the Perseid meteor shower will probably be obscured by clouds late tonight and early tomorrow morning. Too bad because the moon's glare will not be a factor this year.

Posted by: david_in_stafford | August 12, 2010 5:27 AM | Report abuse

I do believe I just heard some raindrops over the sound of the air conditioning unit, here in Silver Spring.

Posted by: Murre | August 12, 2010 5:54 AM | Report abuse

Looks like the Frederick area is getting lit up with lightning, along with the downpours. Had to disable the lightning detector on wunderground,figuring it was bad data being sent. Then, I looked out the back towards Frederick. Lots of flashes, too many to count, lighting up the clouds.

Posted by: dprats21 | August 12, 2010 6:17 AM | Report abuse

You know a storm is coming when it gets darker as the sun rises. This storm is not letting up. The light show is something to see. Seems to be dipping south towards us in Laytonsville. Wow is it getting dark.

Posted by: dprats21 | August 12, 2010 6:35 AM | Report abuse

Wonder if this is the sixth time the overnight temp at DCA failed to drop below 80 degrees. We've had four days where temps didn't drop below 80 at all, plus the Sunday storm day, when the temp didn't drop below 80 until the storm hit after 3 p.m.

Restless nights even if you have a/c and agony for people without a/c. Even the Brazilian rain forest cools off a bit a night, I've read.

Posted by: JerryFloyd1 | August 12, 2010 7:20 AM | Report abuse

Temp just dropped 10 degrees where I live as storm hit so chances are DCA will finally be below 80 degrees very soon (if it hasn't already happened).

Posted by: JerryFloyd1 | August 12, 2010 7:31 AM | Report abuse

Are there any chances the remnants of the tropical depression in the Gulf make it our way next week?

Posted by: pkn92 | August 12, 2010 8:17 AM | Report abuse

Some of the remains of TD 5 are likely to be pulled up along the East Coast. The models differ in where the rains are enhanced but anywhere from the Appalachians to the Delmarva could see more rains next week thanks to it. As for my midday rains, mea culpa, they have already come and gone.

Posted by: davidstreit1 | August 12, 2010 8:24 AM | Report abuse

Crap, that means we're not getting any more rain today? My yard is toast. Thoroughly disgusted.

Posted by: weathergrrl | August 12, 2010 9:05 AM | Report abuse

Today's digit gets an '8' just for this morning's entertainment value. Nice storm!

Posted by: ennepe68 | August 12, 2010 9:41 AM | Report abuse

I would have thought rain chances this evening would have lowered, but it looks like they are up from 20% to 40% is this accurate?

Posted by: snowlover | August 12, 2010 10:06 AM | Report abuse

QUESTION: How bad was it in Arlington (Fillmore and Arlington Blvd)? Wonder if I have a flooded basement? (i am out of town)


Posted by: dezlboy1 | August 12, 2010 10:14 AM | Report abuse

@dezlboy -

Most, if not all, of the action was on the Union side of the Potomac River. The storms just exploded south and east as they came over DC and barely scraped the area around DCA and the Pentagon. It poured in Crystal but not too far west it was harmless. Don't know where Fillmore and Arl Blvd is -- Seven Corners area?

Posted by: ennepe68 | August 12, 2010 10:28 AM | Report abuse

We named last winter's blizzards, so when are we going to start giving names to these t-storms? Pepcopolypse?

Posted by: DOG3521 | August 12, 2010 11:22 AM | Report abuse

@DOG3521 - Pepcopolypse -


Posted by: waterfrontproperty | August 12, 2010 11:26 AM | Report abuse


Don't think this morning's storms have had much of an impact either way on shower/storm potential for later today. But, the 20% chance cited in the earlier version of the forecast for this evening (a higher percentage had been mentioned for the midday/afternoon) may have been a bit low based on what models have been showing the past couple days. That's reflected with the increase to 40% in the updated forecast for this evening.

Posted by: CapitalWeatherGang | August 12, 2010 12:09 PM | Report abuse

New storms firing up to the NW now as another piece of energy swings by.

Posted by: Ian-CapitalWeatherGang | August 12, 2010 12:35 PM | Report abuse

what time are the afternoon storms coming? i want to avoid them. i drove to work during the worst of this morning's storm, and although i was not hurt at all--in fact, it was kinda cool-- i want to try to go home tonight either before or after another storm!

Posted by: saracooper | August 12, 2010 1:20 PM | Report abuse

Ian - Was going to ask how juicy those "apples" are. From the radar they seem to be popping up pretty fast.

(Maybe I should say how juicy those "peaches" are - seems a more appropriate summer term.) :)

Posted by: MKoehl | August 12, 2010 1:23 PM | Report abuse

to the southeast of the Frances Perkins Building, looks like it's getting a little darker. I got this sent to me: The National Weather Service Storm Predication Center has issued a Severe Thunderstorm Watch for portions of DC, parts of Central MD, parts of Northern VA, and Coastal Waters effective from 2:50 PM EDT until 9:00 PM EDT

Posted by: JefffromHuntington | August 12, 2010 3:13 PM | Report abuse

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