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2020 Mid-Atlantic Severe Weather - General Thread


Kmlwx
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4 minutes ago, Eskimo Joe said:

Lightning picking up on the southern edge of the line.  It's just now starting to enter the better environment so the next 40 to 45 min will be key to see if it has any staying power.

              Interesting trade off as the line moves east.     It's moving in to way better instability, but the good wind fields are quickly moving off to the east, and the low level flow is veering.  Storm-relative helicity will therefore be dropping as the line approaches the DC-Baltimore area,  so the tornado threat is decreasing, but the wind threat is likely increasing.    That said, despite the decreasing shear, it still could be sufficient for some rotation within the line.

 

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WUUS51 KLWX 131748
SVRLWX
MDC031-VAC059-107-131830-
/O.NEW.KLWX.SV.W.0052.200413T1748Z-200413T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
148 PM EDT MON APR 13 2020

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MONTGOMERY COUNTY IN CENTRAL MARYLAND...
  EAST CENTRAL LOUDOUN COUNTY IN NORTHERN VIRGINIA...
  NORTHERN FAIRFAX COUNTY IN NORTHERN VIRGINIA...

* UNTIL 230 PM EDT.

* AT 148 PM EDT, SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR LEESBURG TO OATLANDS, MOVING EAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...DAMAGING WINDS WILL CAUSE SOME TREES AND LARGE BRANCHES 
           TO FALL. THIS COULD INJURE THOSE OUTDOORS, AS WELL AS 
           DAMAGE HOMES AND VEHICLES. ROADWAYS MAY BECOME BLOCKED BY 
           DOWNED TREES. LOCALIZED POWER OUTAGES ARE POSSIBLE. 
           UNSECURED LIGHT OBJECTS MAY BECOME PROJECTILES.

* LOCATIONS IMPACTED INCLUDE...
  ROCKVILLE, BETHESDA, GAITHERSBURG, RESTON, LEESBURG, OLNEY,
  HERNDON, VIENNA, FALLS CHURCH, BROADLANDS, LANSDOWNE, LOWES ISLAND,
  BRAMBLETON, PIMMIT HILLS, POOLESVILLE, MCLEAN, AMERICAN LEGION
  BRIDGE, ASPEN HILL, POTOMAC AND NORTH BETHESDA.

 

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