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Posted at 5:00 AM ET, 07/15/2010

Forecast: Muggy until further notice!

By David Streit

* The curious case of Tom Sater | Tropics: not be quiet for long? *
* UnitedCast | Outside now? Clouds, temps & more: Weather Wall *

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


The only reason this isn't lower is there are no storms. Humidity is not our friend as temps climb.
Get the 'Digit' on Twitter


Today: Sunny, humid. 92-96. | Tonight: Fair, balmy. 71-77. | Tomorrow: Mostly sunny, still humid. 93-97. | A Look Ahead | Get Express Forecast by E-mail


By David Streit, CWG Meteorologist

We know this drill very well by now, 90s and plenty of humidity through the weekend. Well it is the heart of summer so what can one expect in DC. The humidity - amplified by the recent rains - is sufficiently high to dampen our day time heating by a degree or two or three. I am not sure it is a fair trade but the big upturn in rains has been the salvation for many of our trees and gardens cashing in that much-needed moisture.

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): There will be plenty of sunshine pushing temperatures quickly through the 80s in the morning. There should be enough cumulus clouds by afternoon to slow the warming but highs will still be in the low-to-mid 90s across the area. Humidity is on the high side with light winds from the north. The rain threat is close to nil. Confidence: High

Tonight: This evening is plenty muggy with 80s throughout the area. No evening activity conflicts as thundershowers remain out of the picture. Lows reach the 70s. Confidence: High

Keep reading for the forecast through Monday....

A fawn eating a small branch that was blown down in yesterday's storm in Oakton, Va. By CWG photographer Kevin Ambrose.

Tomorrow (Friday): The only change from the day before is just a smidgen more humidity, afternoon clouds and about a degree rise in temperature. Highs again top out in the low-to-mid 90s with the possibility of an overachieving upper 90s reading somewhere. Winds are light from the southwest. Confidence: High

Tomorrow Night: A partly cloudy evening holds minimal shower potential as 80s keep it tropical outside. Overnight lows fall to the 70s. Confidence: Medium-High


On Saturday, a cool front approaches from the west early and mid-to-high level clouds quickly increase in the morning. Thundershowers are possible, but not definite (50% chance), from midday into the evening. Any storms that do develop could have potent downpours. Temperatures top out in the mid-80s to low 90s. Confidence: Low-Medium (Updated: Thurs. July 15 @ 1:10 pm)

Sunday starts out in the low-to-mid 70s as the cool front that could bring showers Saturday barely makes a dent. Humidity is strong as ever and highs quickly rise to the upper 80s to low 90s as skies clear early in the day. Light breezes and no thundershower threat are our consolation prize. A balmy evening encourages those end of the weekend cookouts. Confidence: Medium-High

Monday morning lows are again in the low to mid 70s but with more early sun, readings climb quickly. Temperatures ascend to the low-to-mid 90s with ease. Despite the ongoing mugginess there is minimal thundershower potential to interfere with outdoor activities. Confidence: Medium-High

By David Streit  | July 15, 2010; 5:00 AM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: UnitedCast: Very warm and humid
Next: The thunderstorm that saved Washington


First! Weather is very nice this morning.

Soil moisture may prevent triple-digit temperatures for a while, but heat index tomorrow should be high. Rain threat only on three days of six; one of those days is aoa 20%.

Posted by: Bombo47jea | July 15, 2010 7:34 AM | Report abuse

Hey good morning Bombo47jea, I don't usually see you on so early! Yes the humidity is going to be upppp thereee... ooof. Did you like the funny forecast title? NOTICE: WE WILL BE UNCOMFORTABLE TILL SEPTEMBER haha

Posted by: Camden-CapitalWeatherGang | July 15, 2010 8:32 AM | Report abuse

I'm not sure I see the good rain on Sat at this point. Models have trended downward with it seemingly. To me, this last period was a hiccup until we see rain more regularly.

Posted by: Ian-CapitalWeatherGang | July 15, 2010 9:51 AM | Report abuse

How strong of a cold front are we looking at on Saturday, and how fast will it be moving? Planning on flying the Cessna up to NE PA, and it looks like that might be problematic.

Posted by: chris_soule | July 15, 2010 10:14 AM | Report abuse

Muggy until September? Seriously? We can't get one day of nice freaking weather until September?!?! Camden, you must not want a Christmas card from me this year.

Posted by: authorofpoetry | July 15, 2010 10:40 AM | Report abuse

Longer range stuff still suggests the big story soon will be heat again. I wouldnt be surprised if this next heat wave (especially if we can stay at or above 90 through the weekend) will be the longest of the yr.

Posted by: Ian-CapitalWeatherGang | July 15, 2010 11:25 AM | Report abuse


Latest guidance suggests this is a pretty weak front that will fall apart over our region. The forecast above may overstate the odds of precip/storms and rainfall potential. We'll update in the future forecasts as more info becomes available.

Posted by: CapitalWeatherGang | July 15, 2010 11:29 AM | Report abuse

Yes, but how hot will it get? It's really sad that I now think 90-92 is "cool" and can deal with a few days of that. But lordy, please no more 100 degree days.

Posted by: hereandnow1 | July 15, 2010 12:29 PM | Report abuse

hereandnow1, the setup looks quite similar to the period just after July 4. I guess the additional ground moisture/etc could hold things back a bit, but we could also evaporate a lot of that out moving forward.

Posted by: Ian-CapitalWeatherGang | July 15, 2010 12:38 PM | Report abuse

What is the DC record for calendar year 90 degrees days. By my count today is the 32 day this year, and accuweather is prediting 14 more in a row (I know you said this during the last heat wave but also what is the consective day record)-- so we might enter August at about 45 or so.

Posted by: minerdude | July 15, 2010 12:46 PM | Report abuse

No comments on the cute fawn picture?? C'mmon!!

Posted by: Camden-CapitalWeatherGang | July 15, 2010 1:11 PM | Report abuse

Note... Saturday forecast updated to reflect models having backed off at least somewhat on precipitation chances for Saturday. Still a good deal of uncertainty though.

Posted by: Dan-CapitalWeatherGang | July 15, 2010 1:15 PM | Report abuse

authorofpoetry, sorry I am sorry! didn't mean to offend with predictions of high dewpoints ;-)

minerdude, I think Ian will have this answer later.. He seems to know alllll the numbers, around here!

Posted by: Camden-CapitalWeatherGang | July 15, 2010 1:15 PM | Report abuse

The record for a yr at or above 90 is 67 in 1980. Behind that there are 5 yrs with 59 and 14 years (total) with 50 or more above 90. With 32 days as of today we've already beaten out 74 other years going back to 1872.

Posted by: Ian-CapitalWeatherGang | July 15, 2010 1:33 PM | Report abuse

Re: lengthiest at or above 90, will have to look closer later and get back on that. I see 21 in 1980 which is probably close to if not the longest.

Posted by: Ian-CapitalWeatherGang | July 15, 2010 1:42 PM | Report abuse

I wish this blog was functional in 1776, during the summer that the US declared our independence from Britain. I'd like to hear the meteorologists of that time try to explain to the colonists why they declared their independence in the hottest month of the year, and without AC! Surely, future celebrations would have been better spent in the Fall, right?

Posted by: authorofpoetry | July 15, 2010 2:18 PM | Report abuse

The humidity is definitely up. Between 90 degree high humidity and 100 degree low humidity? Neither is ideal but I will have to pick 90 and humidity - like today. At least I don't feel like my skins are burning. Also that is the norm in this area.

Posted by: LoudounGeek | July 15, 2010 2:43 PM | Report abuse

What's causing the excessive heat in Russia?

Very bad there, the worst heat in 130 years and many drownings as people try to escape the heat.

Posted by: JerryFloyd1 | July 15, 2010 3:11 PM | Report abuse

@Ian, I'm 99% sure that the 1980 record of 21 consecutive 90-degree days is the all time DCA record. I think the consecutive days record before then might have been about 15.

Dallas had an incredible number of 100-plus days in 1980, 69, including a stretch of 42 consecutive days of 100 degree or more days. The worst of the Dallas heat (113 degrees) occured in late June; then the heat bubble moved our way. That was heat you can heave in.

Posted by: JerryFloyd1 | July 15, 2010 3:19 PM | Report abuse

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