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Posted at 03:45 PM ET, 07/29/2011

PM Update: Another day of record heat as DC hits 104; somewhat less hot this weekend

A few thunderstorms could pop this evening

Heat advisory thru 9 pm | Code orange air quality through Saturday, unhealthy for sensitive groups

5:30 p.m. update: Today’s official highs - 104 at Reagan National Airport (DCA), Dulles 103, BWI 101 - all new records for the date.

4:15 p.m. update: Reagan National “unofficially” hit 104 today, which would put today in a tie for the fifth hottest all-time (with three other dates).

From 3:45 p.m.: For the second straight Friday, record heat has run rampant in the Washington, D.C. metro region. Reagan National, which surged to at least 102, blew by the old 1993 record of 99. Dulles Airport reached at least 100, surpassing its record of 97, also from 1993. And BWI at least matched its record of 99 from 1954. After a weak cold front and some widely scattered storms pass tonight, we dial back the heat a hair this weekend, with low-to-mid 90s rather than triple digits.

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: A few gusty storms could develop this evening (20-30% chance) with better chances in the north and northwest suburbs; otherwise it’s steamy and possibly record-breaking. The record warmest lows are 78 at both BWI and Reagan National (and 85 at Dulles), and it may not cool sufficiently to get there. Under partly cloudy skies, lows range from the low-to-mid 70s in the cooler suburbs to around 80 downtown. These could dip slightly lower in locations that get storms.

Saturday and Sunday: A breeze from the north (Saturday) that gradually shifts to out of the east (Sunday) gives us modestly lower heat and humidity. Sunshine is plentiful with highs both days in the low-to-mid 90s. Saturday night’s rather warm, with lows from the upper 60s in the cooler suburbs to the mid-to-upper 70s downtown

See Camden Walker’s forecast through early next week. And if you haven’t already, join us on Facebook and follow us on Twitter

More heat stats:
* Today’s 104 at DCA is the hottest day since August 17, 1997 when it hit 105.
* The four days hotter than today at DCA? 106 on 7/20/1930 and 8/6/1918, 105 on 8/17/1997 and 7/10/1936
* Today was DCA’s fourth day this year at or above 102, tying it with 1930 for most year-to-date.
* Today was DCA’s fourth day at or above 100, tying it (with1993 and 2010) for third most year to date (1988 had five, and 1930, six).
* Today was DCA’s 18th day at or above 95, the second most year to date (1991 had to 21)
* DCA most likely tied today’s 1949 record for warmest low temperature this morning, only dropping to 80. Assuming it holds (doesn’t drop below 80 before midnight), it will be the 5th time this month the low did not fall below 80, most on record.

Related: Heat wave & hot weather guide | Submit your hot weather photos

By  |  03:45 PM ET, 07/29/2011

Categories:  Forecasts

 
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