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Posted at 3:15 PM ET, 06/21/2010

PM Update: Summer solstice brings more 90s

By Ian Livingston

Hot, increasingly humid, through mid-week; then more heat

* The heat waves of the 1930s | NatCast *
* Outside now? Radar, temperatures & more: Weather Wall *

The first day of summer has brought with it our second official (3 days 90+ or more) heat wave of the season. And you better like it, because we'll be adding at least a handful more days to this streak it would appear. Highs reaching near 90 and into the lower 90s this afternoon are a touch cooler than yesterday but still above normal for this time of year. The outlook for the rest of the week varies between hot and really hot with just a few opportunities for cooling showers and storms.

Webcam: Latest view of D.C. from the Netherlands Carillon at Arlington National Cemetery. Courtesy National Park Service. Refresh page to update. See this image bigger on our Weather Wall.

Through Tonight: The best thing about summer around here is the decent evenings it can produce. This will be a warm one, though not too bad as temperatures fall through the mid-80s near sunset. We stay mostly clear overnight, but as the high pressure drifts offshore, humidity levels should begin to rise by morning. Temperatures bottom out in the mid-60s in the cooler spots to the lower 70s in the warm ones.

Tomorrow (Tuesday): Plenty of sunshine will help temperatures quickly jump into and through the 80s during the morning. By late afternoon, readings rise to the low 90s many spots, with perhaps a few mid-90s mixed in as well. Winds from the south or southeast will make it considerably more humid than today. Late day we'll have to watch for an isolated storm and the potential for more development heading into the evening or overnight, though it looks like most will stay to our north.

See Jason Samenow's full forecast through the beginning of next week. And if you haven't already, join us on Facebook and follow us on Twitter.

Eyes on the tropics: A tropical wave has become better organized in the Caribbean today and has been declared an "invest" by the National Hurricane Center. The NHC currently gives the system a 30 percent chance of developing in the next 48 hours, though the likelihood of such has grown recently. Forecasted conditions appear to be fairly favorable for strengthening in the coming days should the system continue to organize. Several models place the system in the Gulf of Mexico around next weekend, but it's much too early to say where or if this will happen.

By Ian Livingston  | June 21, 2010; 3:15 PM ET
Categories:  Forecasts  
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Next: 2010: Warmest spring on record for Washington D.C.


I'm probably wrong, but I already feel as if we've had more 90-degree days this month than we did all last summer.

Posted by: kevinwparker | June 21, 2010 4:38 PM | Report abuse

How many 90 degree days do we typically have per year here in Washington? I thought I heard Howard Bernstein on channel 9 say it was only 9 per year and that seemed low.

Posted by: jmsbh | June 21, 2010 4:46 PM | Report abuse

Average 30 days of 90 degrees or over I think, for the SEASON.

We probably had 15 this year already.

Posted by: LoudounGeek | June 21, 2010 4:52 PM | Report abuse

I believe the 30 number (31.3 quoted in CWG outlook) is for SUMMER only or June/July/Aug. I'd have to look at my records for DC to get a seasonal number if that's correct. Last year we had 22 90+ in total I believe, 2 in June. This yr we have seen 15 so far, 10 in June. I have a post set for sometime this week that examines a bunch of this stuff.

Posted by: Ian-CapitalWeatherGang | June 21, 2010 4:57 PM | Report abuse

Maybe Bernstein was suggesting 9 for June, on average. That would make much more sense.
Thanks for the responses !
If we are at 15, let's hope we are hal way through, but it sure doesn't look that way.

Posted by: jmsbh | June 21, 2010 5:17 PM | Report abuse

Here are the avg 90+ days overall and under the current 30 yr norm... 1871 is included in the historical data but I don't have daily info on that year. 9 may be "normal" season-to-date through end of June?

90+ summer (1872-2009 avg) = 26.1
90+ summer (1971-2000 avg) = 31.3

90+ season (1872-2009 avg) = 31.3
90+ season (1971-2000 avg) = 36.7

90+ June (1872-2009 avg) = 6.4
90+ June (1971-2000 avg) = 7

Posted by: Ian-CapitalWeatherGang | June 21, 2010 6:12 PM | Report abuse

The record for June in Washington seems to be 17 days aoa 90F.

If we get 90 the next week or so we'll have 16 days by next Sunday...though this June doesn't seem as hot as some in the past...maybe my air conditioner is working better.

Posted by: Bombo47jea | June 21, 2010 7:46 PM | Report abuse

Did you all enjoy the evening tonight? Potentially our last non-oppressive evening for quite some time to come? (UGH!)

Posted by: Camden-CapitalWeatherGang | June 21, 2010 11:07 PM | Report abuse

Awoke this AM here in north Idaho to rain and 51 degrees, needed the fireplace all day, and just last week in crossing the Continental Divide over in Montana encountered snow showers @7200 feet. That should cool you off a little.

Posted by: slim2 | June 21, 2010 11:53 PM | Report abuse

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