Update at 10:50 p.m. — The earlier Flash Flood Watch has been upgraded to a Flash Flood Warning. Flooding near streams and in low-lying areas is imminent. The warning is in effect until 1:45 a.m.
From the National Weather Service:
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Weather
A cold front is likely to bring slow-moving thunderstorms and downpours to the D.C. area later today.
The National Weather Service has issued a Flash Flood Watch, which takes effect at noon, cautioning of the possibility of 2-4 inches of rain falling in a short period of time. Such rainfall could cause flash flooding, as happened nearly two years ago.
A portion of Arlington County is now under a Severe Thunderstorm Warning as a line of potent storms bears down on the area.
The warning encompasses a southern portion of the county.
Arlington County and the D.C. area is under a Severe Thunderstorm Watch tonight.
The watch is in effect until 9 p.m. Forecasters say strong storms packing quarter-sized hail and strong winds are possible.
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Update at 8:25 p.m. — Now the remainder of Arlington is under another Severe Thunderstorm Warning.
Pretty much the entire immediate DC area under severe storm warning now through around 9p. Storms likely to unleash 50–70 mph winds in some areas along with frequent lightning and very heavy rain. https://t.co/9keVWTga9c
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Arlington County and much of the region is now under a Severe Thunderstorm Watch.
The watch is in effect until 10 p.m. tonight. Forecasters say strong storms with damaging winds are possible this afternoon and tonight.
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Update at 4:40 p.m. — Arlington is now under a Severe Thunderstorm Warning. From the National Weather Service:
The National Weather Service in Sterling Virginia has issued a
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Update at 11:45 p.m. — Outages in Arlington are down to about 600 customers, according to Dominion.
Update at 5:55 p.m. — Dominion reported approximately 48,000 customers without power in Northern Virginia, including nearly 6,300 in Arlington, as of 5:30 p.m., though those numbers are starting to come down slightly.
An earlier High Wind Watch has been upgraded to a warning.
It’s going to be a really windy afternoon for Arlington County and other parts of the D.C. area. Expect strong gusts, downed trees and power outages, forecasters say.
Arlington will be under a High Wind Watch starting Friday morning.
Today’s warmth will be giving way to colder weather tomorrow, and with that change will come strong winds. Gusts of up to 60 mph could down trees and tree limbs, potentially damaging structures, blocking roads and knocking out power.
If your outdoor plants are especially delicate, you might want to cover them or bring them inside today.
A Frost Advisory is in effect for early morning Friday, as temperatures in Arlington are expected to dip into the 30s overnight. Arlington is on the edge of a Freeze Warning, in effect for Fairfax County and other points north and west.
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(Updated at 4:30 p.m.) Arlington and much of the D.C. area is now under a Wind Advisory.
The advisory is in effect until 8 p.m. Expect gusty winds of up to 50 mph between now and then, and the potential for falling tree limbs and power outages, forecasters say.