PM Update: Another cold front for Thursday; Rim Fire growth slows

September 4, 2013

Temperature Map

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

With humidity basically nonexistent, plenty of sun, and a pleasant breeze, today’s perfect 10 sure verified nicely. Nothing too interesting weatherwise is on tap for the next day, and beyond that as well if we want to look further. Try to find some time to spend outdoors — we’re seemingly into what is often the best period of weather in the region all year!

Through Tonight: Mostly clear and pretty sweet. It’s another “windows open” type of night with humidity staying pretty low (perhaps eventually slightly higher than recently). Readings dip to the upper 50s in the typical suburbs to the mid-60s downtown. Winds are light.

Tomorrow (Thursday): A cold front passing by should want to do so in a dry fashion. Yet, we might see some temporarily increased cloudiness, and maybe even a quick shower, in an otherwise mostly sunny day. Temperatures are probably similar to today, maybe a bit higher thanks to winds downsloping (leads to warming) off the mountains. Highs head for the mid-80s many spots. Winds as high as about 15 mph sustained blow from the west, shifting to the northwest during the day — perhaps becoming noticeably gusty by afternoon. Cooler air filters back in heading into the night…

See Dan Stillman’s 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.


Late summer scenery in Loudoun County. (Robert/rok20147 via Flickr)

Rim Fire update: The Rim Fire impacting parts of Yosemite National Park, now California’s 4th largest on record, has grown only slightly in recent times. Slow growth is thanks in part to moisture laden air settling into the region. The fire has now burnt more than 237,000 acres, just about 2,000 acres more than yesterday. As of this morning, it was 80 percent contained, though full containment is not expected until September 20. NASA has posted some great new imagery showing both how the fire has progressed since it began and what it looked like from satellite in recent days.

Pollen update: Weed pollen is moderate to high, with ragweed alone making up 41.53 grains per cubic meter of air — 91 percent of the count. We’re right around typical peak for ragweed, but it has run below average much of this year. Grass pollen and mold spores are also moderate to high, while tree pollen is low.

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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Jason Samenow · September 4, 2013