Updates: Tornado watch issued, runs until 8 p.m. as remnants of Fred pass the D.C. region.
11:40 a.m. — Tornado watch as storms begin to form
A tornado watch has been issued by the National Weather Service. It runs until 8 p.m.
Original post below
As the remnants of Fred steam north-northeast through the Appalachians, a severe weather threat develops locally Wednesday afternoon and perhaps lasts into the evening.
On Wednesday morning, a developing line of broken showers and storms extends from west of Richmond through Charlottesville and up into western Maryland. The line should move through our area between about 11 a.m. (west) and 5 p.m. (east). While the line itself is moving east-northeast, individual storms in the line are moving more toward the north. It’s also possible another broken line will pass Wednesday evening, although it seems odds for that are best north of the city.
Given considerable vertical wind shear, or turning winds with height, the potential for brief tornadoes is there with any storms that become intense. There’s also a risk of some flooding, damaging wind gusts and dangerous lightning.
https://www.washingtonpost.com/weather/2021/08/18/remnants-fred-will-deliver-flash-flood-tornado-threat-dc-region-this-afternoon/?