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Posted at 9:20 AM ET, 06/24/2010

Forecast: Likely hottest day of the far

By David Streit

Triple digits a possibility!

* June heat threatens D.C. record | Arctic sea ice melting fast *
* Code Orange air quality | Radar & more: Weather Wall *

Today's Daily Digit
A somewhat subjective rating of the day's weather, on a scale of 0 to 10.
3It is going to be a blast furnace out there. Don't we get some compensation for the winter we suffered through?
Get tomorrow's 'Digit' on Twitter tonight


Today: Hot, humid, 30-40% chance of p.m. t'storms. 95-100. | Tonight: Any t'storms end early. 69-74. | Tomorrow: Sunny, less humid. 89-93. | A Look Ahead | Get Express Forecast by E-mail


By David Streit, CWG Meteorologist

Let's get this up front; I have very little good news in this forecast. The only break in the heat and humidity comes on Friday and it is fleeting. Rain for the gardeners in town will be very hard to come by. The only thing we might have to show for it is a possible new record high (current record 98) for the date. If National Airport were to hit 100, it would be the first time in triple digits since August 8, 2007.

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): Heat and humidity are on the agenda today with readings in the 80s by mid-morning and 90s by mid-day. Mostly sunny skies will give way to a few much welcome cumulus clouds by mid-afternoon as highs peak in the mid-to-upper 90s to near 100 (yesterday's high was 97). Breezes from the west at 10 to 15 mph provide some modest relief. A weak cool front will be approaching late afternoon with a chance of scattered thunderstorms but with most amounts less than a quarter inch. Storms that form may produce strong, damaging winds.Confidence: Medium-High

Probability: 30-40%
Coverage: Isolated to scattered
Likely timing: Late afternoon to early evening

Tonight: Any thunderstorms quickly disappear by sunset but the heat lingers with readings in the 80s. Light winds from the northwest gradually bring in drier and cooler air overnight with lows in the upper 60s to lower 70s. Confidence: Medium-High

Keep reading for the forecast through Monday....

Tomorrow (Friday): Highs still make it to the upper 80s to lower 90s but compared to Thursday this is comfortable. A little less humidity helps the cause. Very light winds and sunny skies complete the package. Confidence: High

Tomorrow Night: Temperatures drop off a little faster this evening with upper 70s to lower 80s for evening activities. Winds are calm and skies are clear. Lows reach the upper 60s to lower 70s. Confidence: High


A thunderstorm moves east of Oakton, Va. Tuesday. By CWG photographer Kevin Ambrose.

Saturday has plenty of sun for the area. However, the heat and humidity are going to be creeping up noticeably. Temperatures quickly climb to the low-to-mid 90s with barely a breeze or a cloud for and relief. Confidence: High

Sunday dawns just a little warmer and a little more humid. A few thundershowers are possible (30% probability) mainly on the north side of the city by afternoon, which could provide a bit of cooling. Most of the region still manages to top out in the mid 90s and hotter areas in the city and south could see upper 90s under mostly sunny skies. Confidence: Medium-High

Monday starts out muggy with morning lows in the mid 70s. A cold front approaches from the west but with the head start on temperatures it is very likely we hit low to mid 90s before a line of thundershowers zips across the area in the mid-to-late afternoon. The chance of showers at this point looks good (60% probability). Confidence: Medium

By David Streit  | June 24, 2010; 9:20 AM ET
Categories:  Forecasts  
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Pattern change next week??

Posted by: eric654 | June 24, 2010 8:04 AM | Report abuse

Self-righteousness isn't pretty, but where are the snow-haters now? I can only assume snow-haters also hate heat- I guess you only like sitting in climate controlled air conditioned or heated rooms?

I love the snow and I've also gotta say this weather is beautiful too! Yes it stinks to walk to work in this scorching weather, but after work when you go to your pool for a dip, you're very thankful for the hot muggy weather that warmed the water all day!

Posted by: kolya02 | June 24, 2010 8:23 AM | Report abuse

The Thundercast has a probability of 30% but shows two out of four lightning bolts (50%). One lightning bolt would be 25% and 25 is closer to 30 than 30 is to 50. So should we interpret this to mean that a 30% chance of thunderstorms is 30-50% because it is clearly not 25-30%?

Posted by: blasmaic | June 24, 2010 8:36 AM | Report abuse

The only thing to do now if you have to be outside is to get wet. And it appears mother Nature won't be helping us out much in that department.
Go to the lake, go to the pool, jump in the local swimming hole, run thru the sprinklers, drive to the beach, pour some ice water on your head.
Otherwise stay in the AC, & think about rolling around in the Feb snowdrifts.

Posted by: FIREDRAGON47 | June 24, 2010 9:07 AM | Report abuse


The Thundercast scale has nothing to do with probabilities. Click on the link for what it means...

Posted by: CapitalWeatherGang | June 24, 2010 9:13 AM | Report abuse

CWG, on average what temperature do we have to hit by 10AM in order to hit 100 that day. I see BWI is already at 93 at 9:50AM.

Posted by: mickb1 | June 24, 2010 10:21 AM | Report abuse

mickb1, right about what you reported looks right to me! (sighhh... so hot)

Posted by: Camden-CapitalWeatherGang | June 24, 2010 10:32 AM | Report abuse

Of possible note, especially if a tropical system approaches waters off the Florida east coast:

I personally measured the water temperature on Tuesday about 100 yards of the beach at Ft. Lauderdale and depth of about 10 feet to be 91.2. It was like swimming in a hot bath.

The official buoy measured temperature near Ft Lauderdale currently is 86.5. Either way, it'll be an energy feast for any tropical system crossing such warm ocean water

Posted by: SteveT-CapitalWeatherGang | June 24, 2010 10:32 AM | Report abuse

mickb1 it is tough to call because each day has a different ramp up in temperatures. However, looking at the last few days, highs for the day have been from 7 to 10 degrees above the 10 am temperatures. National was at 91 at 10 am so we could do it if the clouds stay away for a few more hours!

Posted by: davidstreit1 | June 24, 2010 10:39 AM | Report abuse

90 at 10a is a benchmark I've looked at in the past for 100. But that was usually August. Today will be determined by clouds probably, otherwise I think we're on track if there was not that issue.

Posted by: Ian-CapitalWeatherGang | June 24, 2010 10:44 AM | Report abuse

thanks CWG.

Posted by: mickb1 | June 24, 2010 11:29 AM | Report abuse

kolya02: We "snowhaters" are out enjoying the summer.

(Not that there ever were any real snow-haters ... just two-feet-of-snow-three-times-in-one-winter haters ... a distinction that seemed lost on the snow fetishists when all that was going on.)

I'm not a fan of extreme heat either, but at least it doesn't bury my car, ice over my street and weigh down my roof.

Posted by: mhardy1 | June 24, 2010 11:39 AM | Report abuse

Why is the "At a Glance" section only three days long this morning? Not long enough to figure out our percentage rain threat in the next week or so.

BTW, the new HRRR [High Resolution Rapid Refresh] model has a line of nasty convective activity possibly headed our way out of West Virginia in the next few hours. We need to be alert to severe weather and possible power outages within 6-8 hours. High winds could be a distinct threat; hail is less likely but possible.

It's already 95 to 97 degrees out here.

Posted by: Bombo47jea | June 24, 2010 12:23 PM | Report abuse

"but at least it doesn't bury my car, ice over my street and weigh down my roof."

But it does cause severe thunderstorm activity with damaging winds and hail ( leading to significant property damage) and injury and death for the elderly and others sensitive to heat. So as many were reminded during the winter storms, check on your neighbors that might need assistance during this extreme heat. Not everyone has air conditioning or remembers how to avoid heat stroke.

End of mini rant! :)
I am interested to know whether cap weather thinks we will break a record today?

Posted by: soleil2000 | June 24, 2010 12:39 PM | Report abuse

Thunderstorm watch just posted for the area until 8:00 pm:

Posted by: CM_in_Fairfax | June 24, 2010 12:43 PM | Report abuse

FYI National weather service issues severe t-storm watch in effect until 8:00PM.

Posted by: FIREDRAGON47 | June 24, 2010 12:46 PM | Report abuse

Let's all keep an eye to the sky this afternoon. Hail is a possibility.

Posted by: Camden-CapitalWeatherGang | June 24, 2010 12:52 PM | Report abuse

98 degrees at BWI. If it has to be this hot, at least let us hit 100.

Posted by: mickb1 | June 24, 2010 1:22 PM | Report abuse

Nearly every time it approaches 100, the clouds roll in and keep it from hitting that magic figure.

Posted by: HenryFPotter | June 24, 2010 1:38 PM | Report abuse

99 at DCA now! Record for month is 102... which we should miss but we still have time I guess.

Posted by: Ian-CapitalWeatherGang | June 24, 2010 1:58 PM | Report abuse

BWI is officially 100.

Posted by: mickb1 | June 24, 2010 2:03 PM | Report abuse

Light refreshing breezes from the south this AM with temps@65 degrees under deep blue skies and humidity under 40% here in Idaho. That should make you feel better.

Posted by: slim2 | June 24, 2010 2:09 PM | Report abuse

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