Dulles ties record high; BWI sets new record

Heat advisory noon to 8 p.m. | Air Quality alert - unhealthy for sensitive groups (code orange)

5:35 p.m. update: Today’s highs were 98 at Reagan National (1 shy of record from 1991), a record tying 94 at Dulles (matching 1991), and a record breaking 97 at BWI (old record 96 from 1991).

From 3:40 p.m.: For the second straight day, the mercury has reached at least 95 degrees at Reagan National (97 at 3 p.m., record is 99 from 1991). Even during the record hot summer in 2010, consecutive 95+ days didn’t happen until late June! At Dulles, the temperature has reached at least 94, tying the record from 1991. After a muggy overnight, we have another day of heat tomorrow which may be capped off with a thunderstorm.

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:Skies are mainly clear but it’s not cooling off much. Lows range from the upper 60s in the cooler suburbs to the mid-70s downtown.

Tomorrow (Wednesday): We may hit 95 for a third straight day and it remains humid. For at least the start of the day, it should be mostly sunny. Clouds may build in late morning and afternoon as a cold front approaches, triggering some thunderstorms, which may be severe. The greatest concentration of storms is probably north of D.C., but still 50/50 around the immediatro region, trailing to about 30-40% in the southern suburbs.

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

Pollen update: Walter Reed reports trees are MODERATE, grasses VERY HIGH and weeds MODERATE.

DCHeatIs (fill in the blank): On Twitter today, we asked you to complete #DCHeatis ... Here are some of the best answers: “Snowpocalypse’s evil twin brother” (plasser), “an institution” (ballbean2), “soul-scorching” (macacheson). Got any more? Contribute below...