

701 

WWUS20 KWNS 011729

SEL2

SPC WW 011729

MDZ000-NCZ000-PAZ000-VAZ000-WVZ000-020100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 332

NWS STORM PREDICTION CENTER NORMAN OK

130 PM EDT FRI JUN 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MARYLAND

       NORTHWEST NORTH CAROLINA

       SOUTH-CENTRAL PENNSYLVANIA

       WESTERN AND NORTHERN VIRGINIA

       EASTERN WEST VIRGINIA PANHANDLE



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900

PM EDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF ALTOONA

PENNSYLVANIA TO 40 MILES WEST OF GREENSBORO NORTH CAROLINA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...STRONG FORCED ASCENT WITH A LARGE SCALE TROUGH WAS

LIKELY CONTRIBUTING TO AN INCREASE IN LOW-TOPPED CONVECTION ALONG A

COLD FRONT NOW SITUATED FROM ERN OH SWD ACROSS WV...EXTREME SWRN VA

AND ERN TN. EXPECT THAT THIS CONVECTION WILL CROSS THE SPINE OF THE

APPALACHIANS OVER THE NEXT 2 HOURS. AS THE FRONT BEGINS TO INTERACT

WITH GREATER INSTABILITY EAST OF THE MOUNTAINS...MORE  VIGOROUS

STORM DEVELOPMENT IN THE FORM OF BOWING/LEWPING LINE SEGMENTS CAN BE

EXPECTED. A WEAK FRONTAL WAVE MAY ALSO TAKE FORM WITH TIME

COINCIDENT WITH AN INCREASE IN STORMS ALONG A WARM FRONT EXTENDING

ACROSS SRN PA AND INTO THE DELMARVA REGION. IN ADDITION TO WIND

DAMAGE AND SOME HAIL THREAT WITH THE STORMS ALONG THE ADVANCING

FRONT...AN ENHANCED BUT FOCUSED TORNADO THREAT MAY EVOLVE NEAR THE

FRONTAL WAVE AND WARM FRONT.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 22035.





...CARBIN

