The Washington Post

PM Update: Mostly tranquil through tonight, before rain chances rise on Thursday

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Lots of blue sky, mixed with increased cloudiness this afternoon, and moderate humidity levels combined to create a fairly peaceful late-summer day around here. Temperatures in the upper 80s to near 90 are a touch warmer than normal for this time of year, but nothing we can’t stomach at this point.

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

Through Tonight: We start off partly to mostly clear, but clouds are on the increase as the night wears on. There could be a very isolated shower prior to sunset. If you’re outside between 8:22 p.m. and 8:32 p.m., you may be able to catch the ISS passing overhead – it’ll start in the northwest and end in the northeast. Those increased clouds and some moisture return help keep lows from falling below the mid-60s to lower 70s.

Tomorrow (Thursday): A cold front moving through the area will provide more in the way of clouds, and an increased chance of afternoon into evening showers and t’storms. Looks like the main threat would be early to late afternoon (50% chance), but depending on the speed of the front it could be a little earlier or a little later. Widespread severe weather is not anticipated, but any activity could produce heavy rain. Highs should reach the mid-80s to near 90 across the region.

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

Fall forecast: AccuWeather has released its fall outlook. The basic idea around here is “dry and warm” with “tropical concerns.” They’re thinking that the Southeast U.S. is going to be a target for tropical activity into September, with our rainiest time coming in October. To see details on the rest of the country, check out the article.

Pollen update: Walter Reed’s Susan Kosisky reports, “Grass pollen is LOW (NAB range) at 2.56 gr/cubic meter, which is moderate for our local area count. Weed pollen is LOW (NAB range), which is more moderate for our local weed count, and mold spores are HIGH at 18,450.02 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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