PM Update: Staying hot and humid with declining air quality

* Code orange air quality alert Wednesday: unhealthy for sensitive groups *

Temperature Map

Temperatures: Latest D.C. area temperature map. See interactive map on our Weather Wall.

Today’s combination of heat and humidity made it feels as hot as about 100, but – mercifully – fell slightly short of expectations prompting the heat advisory for urban areas to be discontinued (criteria is heat indices of 105+). Wednesday’s more or less a carbon copy of today, but the stagnant air is allowing air pollutants to collect, and a code orange air quality alert has been posted.

Through Tonight: Partly cloudy, warm and muggy.  Temperatures fall back slowly through the low 90s and 80s this evening, with overnight lows from the mid-70s in the cooler suburbs to around 80 downtown.  Winds are very light from the north.

Tomorrow (Wednesday): Hazy, hot and humid.  Like today, highs climb into the mid-90s.  When you factor in the humidity, it will feel like 100 at times in the afternoon.  Winds from the northwest are light at around 5-10 mph.

See Matt Rogers’ forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter . For related traffic news, check out Dr. Gridlock.

Incredible lightning shot from Pittsburgh, via Twitter:

 

Jason is currently the Washington Post’s weather editor. A native Washingtonian, Jason has been a weather enthusiast since age 10.
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Jason Samenow · July 16, 2013