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Posted at 5:00 AM ET, 08/19/2010

Forecast: Sun and warmth to return

By David Streit

Mostly rain-free until Sunday

* Outside now? Radar, lightning, temps & more: Weather Wall *

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


If you were stuck in the deluge yesterday, today might seem like a 10 but slightly warmer & more humid than ideal..
Get the 'Digit' on Twitter


Today: Morning fog then clearing. 84-88. | Tonight: Clear and drier. 62-69. | Tomorrow: Sunny, not as humid. 88-93. | A Look Ahead | Get Express Forecast by E-mail


By David Streit, CWG Meteorologist

We gradually dry out today and the sun reigns supreme for Friday and Saturday. However, with the sun comes the threat of more 90+ days over the next several days. Did you know we have had 53 this year? 14 more to go to the record of 67 from 1980. Fortunately, the normals are finally starting to slip into the mid-80s so maybe we can avoid that record this year. We won't be able to avoid the the threat of rain in this forecast - with the next legitimate chance on Sunday when another slow moving front approaches.

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): Some lingering light rain and/or fog may dampen/moisten the morning commute but clearing skies move across the area by mid-to-late morning. The humidity from yesterday's deluge only slowly departs and highs in the mid-to-upper 80s are less than ideal. But it's a good day for drying out all those puddles. Having said that, I can't entirely rule out a late afternoon thundershower (20% chance), especially south of the District. Confidence: Medium-High

Tonight: Clear skies, calm winds and lower humidity levels are just the ticket. Evening readings still hold in the upper 70s to lower 80s. Lows steadily drop overnight resulting in lower 60s in the outer suburbs to the upper 60s downtown. Confidence: High

Keep reading for the forecast through Monday....

Tomorrow (Friday): Plenty of sunshine and lower humidity are a nice foil for the rapidly rising temperatures. However, another 90+ day is likely in store (#54 this year) with highs closing in on the low 90s. Breezes remain light from the northeast. Confidence: High

Tomorrow Night: As soon as the sun sets (just before 8 p.m. as the days start to shorten more quickly) temperatures drop through the 80s. It won't feel so bad given the lower humidity. Skies are clear and lows end up in the mid-60s in the suburbs to lower 70s downtown. Confidence: Medium-High


Saturday starts out plenty sunny and warm. Humidity starts to sneak up but not too oppressively. An approaching Midwest storm could begin to throw some high thin clouds across the area by afternoon. This is not likely to save us from yet another unseasonably warm day with highs in the upper 80s to around 90. It's a close call as whether we add another 90+ day. The evening is warm and any showers should not arrive until late night. Confidence: Medium

Sunday depends heavily on how well the Midwest storm holds together but we could see another round of showers and thunderstorms. The probability is around 40-50% but for substantial downpours is still only 20-30%. Temperatures start out in the 70s and struggle to get into the lower 80s based on the rainy scenario. Rains could continue off and on through the night. Confidence: Low-Medium

Monday remains mostly cloudy as this shower system is likely to have a hard time pushing out of the area. Showers should be lighter but could still be active through the day. Rain chances are 30-40%. Temperatures again are slow to climb with all the showers so look for a morning of 70s and perhaps lower 80s if there are breaks in the clouds by afternoon. Confidence: Low-Medium

By David Streit  | August 19, 2010; 5:00 AM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: PM Update: More rain possible into the night
Next: Yesterday's rainfall totals


I'm sure glad that second line fell apart/went south late yesterday because I had received 4.22" from the first line here in SS/TP. Now have gotten 8.23" for the month.

Posted by: steske | August 19, 2010 7:08 AM | Report abuse

steske - any flooding in your area/neighborhood? that is a lot of rain, wow.

Anyone skipping work today to enjoy the weather?? :0)

Posted by: Camden-CapitalWeatherGang | August 19, 2010 8:27 AM | Report abuse

No obvious flooding, although I am sure some folks have flooded basements. Mine was starting to get damp when the rain stopped. I didn't get out yesterday to see the impact of the rain on the area. The back yard is like a sponge this morning...Given we have about two weeks left in August, I would guess I have a good shot at topping 10" for the month.

Posted by: steske | August 19, 2010 9:21 AM | Report abuse

About a week ago I solicited the opinions of the readers on this blog about watering new sod. I find it hysterical that 20 minutes after I sent that question, we got like 200" of rain in a week. I will soon ask a question about when to properly rake leaves in the hopes that 20 minutes after that, we'll have fall weather arrive.

Posted by: authorofpoetry | August 19, 2010 9:32 AM | Report abuse

My rain gauge reading in North Arlington near Marymount was 3.1" at the end of the day. About 2.7 of that fell before 730 am or so.

Posted by: Joel_M_Lane | August 19, 2010 9:46 AM | Report abuse

Enough. DCA reported .52" of rain for yesterday. Marymount is not very far from the airport, and another poster on another blog said he got around 3" in Crystal City (right next to Reagan). Will someone buy the good weather people who make the official readings at the airport a new rain gauge, or will everyone else check theirs.

Posted by: ShovelPlease | August 19, 2010 10:19 AM | Report abuse

@Shovelplease, there were some discussions about DCA measurements during last winter's snows when DCA tallied 56.1" and nearly everyone else was reporting 70"-plus inches.

They must use milk jugs to capture and measure precip and snowfall. It's ludicrous that DCA measurements (mis)represent the entire D.C. region.

Posted by: JerryFloyd1 | August 19, 2010 10:27 AM | Report abuse

authorofpoetry, you said,
"I find it hysterical that 20 minutes after I sent that question, we got like 200" of rain in a week."

"hysterical", or...poetic?

Posted by: walter-in-fallschurch | August 19, 2010 11:26 AM | Report abuse

Marymount seems to be about 5 or 6 miles straightline distance from DCA - depending on what part of the airport their weather station is located.

Crystal City is much closer (pretty much adjacent).

Posted by: Joel_M_Lane | August 19, 2010 12:04 PM | Report abuse

Walter - a bit of both I suppose :)

Posted by: authorofpoetry | August 19, 2010 12:08 PM | Report abuse

Both my neighborhood and western Wisconsin [where I was over the weekend] are WATERLOGGED! Time to stop this MUCH-UNNEEDED precipitation.

Despite the flooding in Wisconsin and Minnesota, farmers up there are expecting bumper corn and soybean crops...not so sure about waterlogged Iowa where there was even more severe flooding. However if it keeps raining, the farmers can't get out to harvest the crop and it rots in the field.

Posted by: Bombo47jea | August 19, 2010 12:24 PM | Report abuse

back on an old thread i asked: what's the average # of 90+ degree days after sept.21? what's the record? how many did 1980 have?

i'm sure you CWG guys have been busily researching this, but you must have just forgotten to post your results...?

on another tack, it's less than 4 months to our annual december 5 snowstorm...

Posted by: walter-in-fallschurch | August 19, 2010 12:44 PM | Report abuse

@water - what is the average high temperature and the average low temperature respectively, say between Sept 22 and Oct 22, in a 50 mile radius from DCA, going back 50 years, but only counting those years that have more than 3 days of 90+ days after Sept 21?

I'm counting on someone to do the research and report back to us for free. I'm anxiously waiting and couldn't find the time to research it myself...

Posted by: LoudounGeek | August 19, 2010 1:40 PM | Report abuse

I haven't looked at that time range specifically, but the avg for Oct is .1 so I doubt it's much higher from Sept 21 through Oct.

Posted by: Ian-CapitalWeatherGang | August 19, 2010 2:37 PM | Report abuse

thanks. wow, so just once every 10 years we get one day of 90+ in october?

i only asked because that contest from a few days ago made the cut-off september 21 (meant, i presume, to be the end of summer, though the equinox is actually on the 23rd this year...), and i fugured you guys being weather experts would have easy access/bookmarks stats like this. if you have a question about architecture/construction or snow sculptures feel free to ask me.

go to that fictional place of fire and brimstone where it's always 90+ degrees.

Posted by: walter-in-fallschurch | August 20, 2010 10:25 AM | Report abuse

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