The Washington Post

PM Update: After a pleasant day, turning hotter

While we extended the 90+ streak to 10 days here in D.C. today, it wasn’t that bad out there and heat indices have consistently run lower than the actual temperature thanks to pretty dry air over the region. Take it in; those dew points are back on the rise soon as a south wind arrives along with a new nose of the upper-level high pressure system that gave us all those super hot days last week and into the weekend.

Through Tonight: This is a nice evening for any outdoor activities or an impromptu sidewalk dinner. Humidity begins to creep back up overnight under partly cloudy skies and a light south wind. Lows should reach the lower 70s in the cooler suburbs to the mid-or-upper 70s downtown.

Tomorrow (Thursday): Temperatures and humidity are on their way back up, but it shouldnt be unbearable out there, especially given how well trained we are at heat at this point. Still, by late day, dew points nearing 70 may become a bit uncomfortable. Highs should reach the low-to-mid 90s in many spots under partly sunny skies (more clouds late than early as a storm system passed by to the north).

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

How hot’s it been? On Monday I gave some perspective of where we stand on the 90+ days list. After two more, we’re now eight days behind the top years of 2010 and 1994 to date. Today’s 90+ also puts us at 21 for the month of July, equal to that of last year and three behind tying the all-time (for any month) record. Yesterday’s 95 also puts us in third all-time to date for 95+ days with 16. That’s one behind last year at this point. The most through today is 21 in 1991.

Pollen update: Susan Kosisky from Walter Reed writes, “A slight rebound in grass pollen as our count becomes MODERATE (NAB range) at 8.95 gr/cubic meter, which is in the high range for local area counts. Weed pollen is LOW (NAB range) at 4.79 gr/cubic meter which is more moderate for our area. Mold spores are MODERATE at 12447.87 spores/cubic meter.”

Ian Livingston is a forecaster/photographer and information lead for the Capital Weather Gang. By day, Ian is a defense and national security researcher at a D.C. think tank.


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