

000 

WWUS20 KWNS 151724

SEL4

SPC WW 151724

DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-CWZ000-160000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 934

NWS STORM PREDICTION CENTER NORMAN OK

1225 PM EST SAT NOV 15 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       DELAWARE

       MUCH OF MARYLAND

       ALL BUT NORTHERN NEW JERSEY

       PARTS OF SOUTHEASTERN PENNSYLVANIA

       MUCH OF EASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL

700 PM EST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES WEST NORTHWEST OF

TRENTON NEW JERSEY TO 20 MILES EAST SOUTHEAST OF SOUTH HILL

VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...VERY STRONG UPPER TROUGH AND ASSOCIATED WIND FIELDS

APPROACHING MID ATLANTIC STATES WHERE AIR MASS HAS CONTINUED TO WARM

AND DESTABILIZE THIS AM.  THUNDERSTORMS EXPECTED TO DEVELOP

ALONG/AHEAD OF COLD FRONT NOW MOVING E OF APPALACHIANS IN THE FORM

OF A SQUALL LINE.  IN ADDITION TO WIND DAMAGE...EMBEDDED SUPERCELLS

ARE POSSIBLE WITH TORNADO POTENTIAL.  ACTIVITY EXPECTED TO SPREAD

NEWD ACROSS THE WATCH AREA DURING THE AFTERNOON.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 23045.





...HALES

