National and BWI hit 99, setting new record highs

Heat Advisory from thru 8 p.m. today, noon to 8 p.m. Thursday | Code Orange Air Quality

5:30 p.m. update: Reagan National hit 99 degrees today at 3:13 p.m., breaking the record of 98 from 1999. BWI also hit 99, setting a new record. The high at Dulles was 96, one off the record from 2007.

From 3:30 p.m. Too hot. Feels like we were just doing this last week – oh right, we were! Anyway, highs have soared well above average, into the mid-and-upper 90s this afternoon, under partly to mostly sunny skies. So far, a record high has been tied at National with a reading of 98 last hour. Baltimore’s 98 (at least) is also a new record. Dulles is lagging a bit, still just shy of today’s record, with some time left to get there. As more of the same is expected tomorrow, it’s no wonder there is a heat advisory again. The air quality won’t be too good either — expect another alert day.

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: All that heat from the daytime is in no hurry to evacuate back into the atmosphere, so temperatures only slowly dip below 90 and into the 80s this evening. Eventually, we should see lows reaching near 70 to the mid-70s. Record high minimums are 77 at DCA and 70 at Dulles.

Tomorrow (Thursday): If you liked today but were yearning for more heat and humidity, this one’s for you. We race off morning lows back into the 90s by lunch, on our way to highs in the upper 90s to near 100. Partly cloudy skies may eventually produce some isolated to scattered (30-40% chance) showers and storms (some of which could be strong/severe) by late afternoon or evening as a cold front slowly approaches. D.C.’s record of 102 is also the monthly record for June which has held for 136 years so far. I don’t think we’ll get there even if it feels like it with heat indices, but there’s a slight chance. Dulles’ record of 96 (1999) is well within reach as is BWI’s 98 (1933).

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

Record June snowpack = flooding? The eight feet of snow on the ground around Donner Pass in California is the highest on record for this time of year, and it’s causing increased concerns for flooding should a summer heat wave hit the area. Still, for a region often engulfed in drought, the news is not all bad.

Pollen update: Susan Kosisky of Walter Reed writes, “Trees are in the LOW range (NAB range) at 7.03 gr/cubic meter. Grass pollen is MODERATE (NAB range) at 8.95 gr/cubic meter which is HIGH for our local area counts. Weed pollen is LOW at 1.6 gr/cubic meter and mold spores are in the LOW range at 4792.23 spores/cubic meter.”