

654 

WWUS20 KWNS 010815

SEL8

SPC WW 010815

MDZ000-PAZ000-VAZ000-WVZ000-011400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 558

NWS STORM PREDICTION CENTER NORMAN OK

415 AM EDT FRI NOV 1 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL MARYLAND

  CENTRAL PENNSYLVANIA

  NORTHERN VIRGINIA

  EASTERN WEST VIRGINIA PANHANDLE



* EFFECTIVE THIS FRIDAY MORNING FROM 415 AM UNTIL 1000 AM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHWEST OF

WILLIAMSPORT PENNSYLVANIA TO 50 MILES SOUTHWEST OF MARTINSBURG

WEST VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 557...



DISCUSSION...A FORCED LINE OF CONVECTION IS EXPECTED TO SHIFT

EASTWARD ACROSS THE WATCH AREA EARLY THIS MORNING AT AROUND 50 KT.

WHILE INSTABILITY IS VERY MARGINAL...THE PRESENCE OF AN INTENSE WIND

FIELD WILL PROMOTE CORRIDORS OF WIND DAMAGE WITH THE PASSAGE OF THE

LINE.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 250. MEAN STORM

MOTION VECTOR 26050.





...MEAD

