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Posted at 5:30 PM ET, 07/ 7/2010

PM Update: Heat wave breaks more records

By Ian Livingston

First back-to-back 100+ days in D.C. since 1999

* Heat vote | Reader Q&A | Snow flashback | Weather Wall | NatCast *
* Stay cool with a CWG Snowmageddon t-shirt: Check it out *

Official highs: DCA 102 (record), IAD 101 (ties record), BWI 101 (record)

Our heat wave continues its crest and records again fell across the area. National, with a high of 102, solidly destroyed the previous record for the day by several degrees. BWI's previous record of 99 also succumbed while Dulles tied its previous record high. Highs around or above 100 area-wide were accompanied by slightly higher humidity levels today. While not brutal by local standards, the higher dew points made things feel a bit worse than yesterday with heat indices near and over 105.

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.

Through Tonight: Another not-so-pleasant evening is scheduled as temperatures slowly dip back toward the mid-90s around sunset. Lows should fall to the mid-70s in the coolest spots to the lower 80s in the warm ones. Thursday's record high minimum for D.C. is 79 set in 1994, and the all-time record high minimum is 84. Last night, D.C. did not drop below 80.

Tomorrow (Thursday): We begin to back away from this crazy heat, but if you hadn't just experienced the past few days you'd probably say it's still pretty darn hot. Partly sunny skies hold highs in the low-to-mid 90s. Add in the humidity, and you're still looking at afternoon heat indices around or past 100. There could be some relief in isolated to scattered afternoon showers or storms. Don't get too excited about that just yet though!

See Dan Stillman's forecast through the weekend. And if you haven't already, join us on Facebook and follow us on Twitter.

More 100-degree stats: With another 100+ day behind us, D.C. has accomplished back-to-back readings this high for the first time since July 5-6, 1999 when temperatures reached 102 and 103 respectively. It is the first time since 1999 that D.C. has seen at least 3 days at or above 100 degrees in one year. The three or more in one year also puts us up with only 10 other years for 100+ days. At BWI, this is the third day in a row 100+, the first such stretch since 1966 and one behind the all-time record string of 4. Hopefully we'll stay here on this stat, but our hottest temperature averages for the year are still to come.

By Ian Livingston  | July 7, 2010; 5:30 PM ET
Categories:  Forecasts  
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Next: NatCast: May our batters be as hot as the weather

Comments

The summer of 99 was NASTY! So hot, so humid, so lacking in rain.

Posted by: BruinGirl2001 | July 7, 2010 3:46 PM | Report abuse

Seriously, this super hot weather combined with lack of significant rainfall is a bad situation getting worse by the day.
The electric bill is going to be thru the roof, & the garden is suffering.
CWG, any chance of good soaking in the next few days?

Posted by: FIREDRAGON47 | July 7, 2010 3:46 PM | Report abuse

When did DCA hit 102? It's been at 99 for the last few hours...

Posted by: hereandnow1 | July 7, 2010 3:53 PM | Report abuse

hereandnow1, sometime in the 6 hours prior to 2... probably somewhere around noon? It is 101 now as well, though all the recent hourlies were 99 as you note.

Posted by: Ian-CapitalWeatherGang | July 7, 2010 4:00 PM | Report abuse

A thunderstorm during the later afternoon on July 7, 1999 brought some much needed (and welcome!) relief from those two awful days. Would that we could get rain tonight.

Having just slogged to the Foggy Bottom Farmer's Market, I can attest it is berry, berry hot on the asphalt where the market sets up its tents (which don't provide much relief from the heat).

Posted by: JerryFloyd1 | July 7, 2010 4:11 PM | Report abuse

Curious... the WaPo weather page says it's currently 29% humidity. Could that possibly be even in the ballpark? I know that hot air is capable of holding more humidity, so maybe it's still only a third of what it *could* hold, but that figure still seems low. FWIW, the humidity reading in a crawlspace under our house (exposed to the outside air through a small window) reads 75% humidity. Puzzling discrepancy here.

Posted by: B2O2 | July 7, 2010 4:25 PM | Report abuse

Should add that that crawlspace is also somewhat cooled and dried by the house A/C, which unfortunately leaks into that crawlspace through some incomplete wooden wall/barrier that I've not been able to completely seal off. In any case, all of that would imply that outdoors should be at least 75%.

Posted by: B2O2 | July 7, 2010 4:29 PM | Report abuse

Hacía mucho calor hoy y Viva España!!

Posted by: JerryFloyd1 | July 7, 2010 4:29 PM | Report abuse

B202, the humidity percentage is correct for DCA but like you note it's because the temperature is so high. Dew points are a better measure.

Posted by: Ian-CapitalWeatherGang | July 7, 2010 4:47 PM | Report abuse

Yesterday, Ian at CWG told us that there have been 102 days in DC with 100+ temperatures since 1872, but only 31 of those have hit 102 degrees or more. So now I'm wondering, besides July 6-7, 2010 (yesterday and today) and the just-cited highs for July 6-7, 1999, how many other times has the DC temperature hit 102 degrees or more for two days IN A ROW?

Posted by: lkusmin | July 7, 2010 4:57 PM | Report abuse

Oops, not sure why that "100+" showed up twice in a row.

Posted by: lkusmin | July 7, 2010 4:59 PM | Report abuse

Ian - thanks so much for that link. I will try to soak up- er, absorb- er, read and retain the explanation there. I'm ultimately looking to monitor a moisture situation in my crawlspace, so I'll have to think about which one is most relevant. (Seems like it's "total available mass of water in the air" that I'm worried about...)

As for the debate there, I wonder if there wouldn't be room to list both on the weather page.

Posted by: B2O2 | July 7, 2010 5:02 PM | Report abuse

Don't panic folks...this weather will break and we will get rain...

Posted by: weatherdude | July 7, 2010 5:06 PM | Report abuse

lkusmin: First, I made a typo... the July 99 dates should be the 5th and 6th (fixed above). Second, here are the others with 2 or more days 102+ in a row:

Jul 5-6 1999 [102 and 103], Aug 16-17 1997 [102 and 105], Jul 16-17 1980 [103 and 102], Jul 9-10 1936 [104 and 105], Aug 4-5 1930 [102 and 102 -- and 101 on the 8th], Jul 19-21 1930 [102, 106 and 103 -- and 100 on 22nd], Jul 21-22 1926 [104 and 103], Aug 6-7 1918 [106 and 104].

Posted by: Ian-CapitalWeatherGang | July 7, 2010 5:23 PM | Report abuse

weatherdude, what are you basing this on? Just curious :-) But I do appreciate your optimism.

Posted by: Camden-CapitalWeatherGang | July 7, 2010 5:54 PM | Report abuse

Re: the "break the heat" thunderstorm I spoke of in an earlier post in this thread might have been on August 17, 1997, rather than July 7, 1999. I don't keep a log or records of any of this stuff and it's hard enough to remember where I put my keys...

Ok, I do remember we had 10.3 inches of snow on February 5-7, 1967, but that's snow, not thunderstorms.

Posted by: JerryFloyd1 | July 7, 2010 6:28 PM | Report abuse

Jul 19-21 1930 [102, 106 and 103 -- and 100 on 22nd]

4 days of 100 or more! 106! wow... i'm secretly kind of sad to see our streak is ending... just to have the record....

Posted by: walter-in-fallschurch | July 7, 2010 9:05 PM | Report abuse

The five hottest days this summer have averaged 100.4 degrees, which ain't bad. I'll leave it to CWG to let us know if and when the 10 hottest days average 100 or more degrees.

Hopefully, not this summer.

Because the warmer it is during the summer, the longer takes for surfaces to cool down so the snow can accumulate.

So the sooner we get some cooler weather the better. One summer, we had a horrible June-July, but on August 1 of that year, DCA had a high of 69 and a(still record) August low of 49. That was sweet and also the end of the summer heat!

Posted by: JerryFloyd1 | July 7, 2010 9:41 PM | Report abuse

Don't b surpised if we c at least 55 or more 90+ days this summer. My orginal 4cast 4 this summer had temps 2.5-4.5 above av. with at least 50 90+ days, & 60% rainfall or less. Also expected 3-5 100 degree days. 4 all us snow lovers, this winter looks bleak.

Posted by: VaTechBob | July 7, 2010 10:52 PM | Report abuse

Some drought...rain threat on 5 days out of 6 [though Monday's 10% is a bit iffy!]...problem still is Friday...I can take the 102 degrees waiting for the bus to that dance better than the threat of a drenching...or worse!

Worst thing about this dance Friday is that "Bobby" is requiring "coat and/or tie" attire..."summer casual" would be far better in these conditions! This is particularly true if we get rain and storms Friday night the way "much-needed rain" keeps doing.

Posted by: Bombo47jea | July 7, 2010 11:54 PM | Report abuse

The Gulf oil spill, hurricanes, and the recent heat wave, which could threaten the electric grids, have many searching for answers. The internet is buzzing with articles and excellent blogs. But could it be simply the biblical sequence of God's wrath being poured out upon the earth which is relevant to current events in today's world? What if we are dealing with the wrath of God? Please visit my blog at http://www.danielsblog.org Author of the book Final Warning

Posted by: daniel24 | July 8, 2010 8:23 PM | Report abuse

The Gulf oil spill, hurricanes, and the recent heat wave, which could threaten the electric grids, have many searching for answers. The internet is buzzing with articles and excellent blogs. But could it be simply the biblical sequence of God's wrath being poured out upon the earth which is relevant to current events in today's world? What if we are dealing with the wrath of God? Please visit my blog at http://www.danielsblog.org Author of the book Final Warning

Posted by: daniel24 | July 8, 2010 8:25 PM | Report abuse

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