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Severe thunderstorm watch until 10 p.m., storms generally sub-severe

Radar & lightning:Latest D.C. area radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

4:35 p.m. update: There are currently no severe thunderstorm warnings in effect for the region.  The heaviest storms are in northern Howard County headed towards Baltimore County and will produce downpours and gusty winds there through the next 45 minutes.  To the south, the storms in Southern Maryland have fallen apart.   And, in between, just a few scattered showers are pushing through the immediate metro area.

Two additional broken lines of showers and storms are approaching from the west, so we won’t be entirely out of the woods for the next few hours, say until around dark.  These are not severe and don’t have a lot of potential to intensify, but we will watch them.  They could still produce some downpours and lightning.  Watch the Twitter feed above for updates.

This is the last update for this post.  Our PM Update will be out around 5 or 5:15 p.m. which will include the forecast through tonight and tomorrow.

4:12 p.m. update: Mainly just scattered showers now entering west side of beltway with heavier storms in northern Montgomery and eastern Frederick county headed into N Howard and southern Carroll counties.  The storm headed into southern Maryland has weakened a bit, but still may pack a bit of a punch as it passes through St. Mary’s County.

3:50 p.m. update: Radar shows a broken line of storms doing another D.C. split with the heavy activity in eastern Frederick county and western Charles county and fairly modest activity in between.  Thundershowers in northern Prince William and western Fairfax counties are generally headed for the District, but are not close to severe.  They could, however, strengthen a bit.

In southern Maryland, we do have a severe thunderstorm warning just issued, which continues through 4:45 p.m. for southern Charles and central St. Mary’s counties.  Storm has produced damaging winds in excess of 60 mph.

3:38 p.m. update: A Twitter follower reports the storm north of Frederick, Md. produced some small hail and gusty winds. This storm is headed east towards Carroll County.

3:30 p.m. update: Radar is lighting up with showers and storms south, west and northwest of the metro area, but with the exception of the in Stafford county, they are mostly non-severe for the moment. A cell just north of Frederick is worth watching and could intensify.

3:20 p.m. update: Severe thunderstorm warning in effect for Fredericksburg, eastern Spotsylvania, southeast Prince William, Stafford and Charles counties until 4:15 p.m.  Storm from Stafford to 10 miles south of Massaponax moving east at 30 mph – has downed trees (per update below).  Damaging winds in excess of 60 mph possible.

3:00 p.m. update: Severe thunderstorm warnings are currently in effect for storms in northwest Fauquier and southwest Loudoun counties as well Stafford and Spotsylvania counties. The Stafford/Spotsy storm has a history of producing wind damage (to the west in Orange County, downed trees) and is headed east at 35 mph towards western Charles and King George counties.

Overview: For the second straight day, a severe thunderstorm watch has been issued for the D.C. metro region.  Scattered thunderstorms are likely into the evening, with damaging winds up to 70 mph the main risk but not likely widespread. Large hail (up to 1.5 inches) is a lesser possibility. Storms will likely contain heavy downpours and dangerous lightning, so when thunder roars, go indoors.

Severe thunderstorm watch area:

Jason is the Washington Post’s weather editor and Capital Weather Gang's chief meteorologist. He earned a master's degree in atmospheric science, and spent 10 years as a climate change science analyst for the U.S. government. He holds the Digital Seal of Approval from the National Weather Association.
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