

007 

WWUS20 KWNS 272254

SEL9

SPC WW 272254

MDZ000-NJZ000-PAZ000-VAZ000-WVZ000-280600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 449

NWS STORM PREDICTION CENTER NORMAN OK

655 PM EDT SUN JUL 27 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHWESTERN MARYLAND

  NORTHWESTERN NEW JERSEY

  CENTRAL AND EASTERN PENNSYLVANIA

  EXTREME NORTHERN VIRGINIA

  NORTHEASTERN WEST VIRGINIA PANHANDLE



* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 655 PM

  UNTIL 200 AM EDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 115

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF

HAGERSTOWN MARYLAND TO 45 MILES NORTH OF WILLIAMSPORT

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 445...WW 446...WW

447...WW 448...



DISCUSSION...SCATTERED TO LOCALLY NUMEROUS TSTMS -- SOME SVR -- WILL

AFFECT WW AREA THROUGH REMAINDER EVENING AND INTO OVERNIGHT

HOURS...BOTH FROM ONGOING PREFRONTAL CLUSTERS AND EVENTUAL

NEAR-FRONTAL BAND MOVING IN FROM W-E AHEAD OF STG SHORTWAVE TROUGH

ALOFT.  REF SPC MESOSCALE DISCUSSION 1489 FOR NEAR-TERM/INITIAL

DETAILS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 26025.





...EDWARDS

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