The Washington Post

PM Update: A frosty chill tonight, but turning spectacular on Tuesday

Frost advisory from 2 a.m. to 9 a.m. for Loudoun, Montgomery, and Howard counties
Freeze warning from 2 a.m. to 9 a.m. for Frederick and Carroll counties

After our dry March, I guess we should all be rooting for a bit of rain, but the forecast is so pleasant it’s hard to do so. Today’s blustery highs near 60 will see a good boost tomorrow along with plenty of sunshine. But first, we’ve got a cold night ahead, with some frost and freeze concerns to the northwest of the city.

Through Tonight: It’s a mainly clear and turning chilly once the sun sets. By early morning, lows should reach the low-to-mid 30s in the colder outlying areas to near 40 downtown. A frost advisory is up just to the north and west of D.C., with a freeze warning for Frederick and Carroll counties. Protect those tender plants!

Tomorrow (Tuesday): After a cold start with some areas of frost around, it’s shaping up as a sweet day. Mostly sunny skies and winds transitioning from northwest to west combine with highs reaching the mid-60s to near 70.

See Jason Samenow’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.

Tornado warnings: The test implementation of new tornado warnings went into effect today (see PDF). The hope is that changes will better communicate the level of threat posed by a tornado by using language to describe the risk. The NWS offices using the new warnings are Topeka, KS, Wichita, KS, Springfield, MO, Pleasant Hill, MO, and St. Louis, MO.

Pollen update: Susan Kosisky from the US Army Centralized Allergen Extract Lab writes, “Tree count remains HIGH at 1285.94 grains/cubic meter, grass count is LOW at 0.96 grains/cubic meter and mold spores are in the MODERATE range at 6768.99 spores/cubic meter. Oak, mulberry, pine and sycamore pollen are the predominant tree offenders.”

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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