Arlington County, D.C. and other surrounding areas are now under an Excessive Heat Warning.

Heat index values are expected to exceed 110 degrees this afternoon, according to the National Weather Service, elevating the risk of heat-related illness — though the temperatures could be moderated in part by pop-up showers.


Update at 5:15 p.m. — As heavy rain continues to fall, high water has been reported on a number of roads, including: along Route 50; on Route 110 below Memorial Drive; at the intersections of Lorcom Lane and Lee Highway; Old Dominion Drive and N. Thomas Street; and at the intersection of N. Quantico Street and 26th Street N.

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Update at 7:45 p.m. — There have been reports of downed trees, branches and power lines in Arlington, but no major power outages have been reported by Dominion. Flights are Reagan National Airport are resuming.

No major flooding issues have been reported, though ARLnow.com’s office sprung a leak during the storm.


Update at 2:25 p.m. — Forecasters warn that a derecho is possible tonight. The last such wind event to hit the region caused significant damage on June 29, 2012.

Potential for a derecho…a line of severe thunderstorms producing widespread damaging winds to develop this afternoon & move through parts of the central Appalachians and northern mid Atlantic region including Washington DC metro. Stay alert for warnings and seek safe shelter. pic.twitter.com/rlkbNzJPgV


Arlington and much of the D.C. region will be under a Wind Advisory starting at 10 a.m. Wednesday.

Forecasters say that a line of showers and thunderstorms in the morning will give way to gusty winds through Wednesday evening. The wind gusts may damage trees and cause power outages.


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