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2020 Mid-Atlantic Severe Weather - General Thread


Kmlwx
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1 hour ago, juliacarolecat said:

Sorry for a silly question, I’m new to posting but a lurker for years.

Is the tornado threat for north/central Maryland and then it will switch to more of a wind threat as it becomes more linear moving East? Ik bowing line segments can produce tornadoes but always thought they were more associated with high winds.

The thinking is more linear as it moves eastward towards the coast, and reading the discussion from Mount Holly they think the most likely place for a tornado is in Cecil over into Newcastle in DE up into SE PA. Possibly some interaction with the warm front lying across that area, backing the flow some is my guess. Bigger overall  threat will be damaging straight line winds, with fairly strong winds aloft and decent Dcape. Bowing segments generally produce straight line winds but can also produce tornadoes as vorticity sometimes develops on the north/south end of the line. How far north are you?

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667   
WWUS20 KWNS 031938  
SEL5    
SPC WW 031938  
DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-WVZ000-CWZ000-040200-  
  

URGENT - IMMEDIATE BROADCAST REQUESTED  
TORNADO WATCH NUMBER 485
 
NWS STORM PREDICTION CENTER NORMAN OK  
340 PM EDT THU SEP 3 2020  
  
THE NWS STORM PREDICTION CENTER HAS ISSUED A  
  
* TORNADO WATCH FOR PORTIONS OF   
  DISTRICT OF COLUMBIA  
  DELAWARE  
  MARYLAND  
  SOUTHERN NEW JERSEY  
  SOUTHEAST PENNSYLVANIA  
  NORTHERN VIRGINIA  
  EASTERN WEST VIRGINIA PANHANDLE  
  COASTAL WATERS  
  
* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 340 PM UNTIL  
  1000 PM EDT.  
  
* PRIMARY THREATS INCLUDE...  
  A FEW TORNADOES LIKELY  
  SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS  
    TO 75 MPH POSSIBLE  
  
SUMMARY...MULTIPLE SUPERCELLS WILL LIKELY DEVELOP NEAR AND NORTH OF  
THE GREATER WASHINGTON D.C. AREA AND SPREAD EAST AS A CLUSTER ACROSS  
THE COASTAL PLAIN THROUGH MID-EVENING. A FEW TORNADOES AND SWATHS OF  
DAMAGING WINDS ARE LIKELY.  
  
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE MILES  
EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHWEST OF WILMINGTON  
DE TO 30 MILES WEST SOUTHWEST OF PATUXENT RIVER MD. FOR A COMPLETE  
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE  
(WOUS64 KWNS WOU5).  
  
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
  
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR  
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH  
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR  
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS  
AND POSSIBLE WARNINGS.  

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...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM EDT FOR SOUTH
CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND...NORTHWESTERN
HOWARD COUNTY IN CENTRAL MARYLAND AND SOUTHEASTERN FREDERICK COUNTIES
IN NORTH CENTRAL MARYLAND...

At 354 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Mount Airy, or near Damascus, moving east at 25 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...For those in the direct path of a tornado touchdown, flying
         debris will be dangerous to those caught without shelter.
         Damage to roofs, siding, and windows may occur. Mobile
         homes may be damaged or destroyed. Tree damage is likely.

This dangerous storm will be near...
  Eldersburg around 415 PM EDT.
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