

863 

WWUS20 KWNS 072302

SEL7

SPC WW 072302

MDZ000-NCZ000-VAZ000-CWZ000-080300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 897

NWS STORM PREDICTION CENTER NORMAN OK

600 PM EST WED DEC 7 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       THE LOWER EASTERN SHORE OF MARYLAND

       EASTERN NORTH CAROLINA

       SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY EVENING FROM 600 PM UNTIL 1000 PM EST.



HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH

SOUTHWEST OF NEW BERN NORTH CAROLINA TO 70 MILES NORTH OF NORFOLK

VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...NARROW LINE OF FORCED CONVECTION NOW BECOMING BETTER

DEFINED OVER S CNTRL VA / CNTRL NC EXPECTED TO MAINTAIN STRENGTH AND

POSSIBLY INTENSIFY THROUGH MID EVE AS LEADING EDGE OF STRONG DCVA

ASSOCIATED WITH E TN UPR VORT ACCELERATES ENE ACROSS REGION.

SUFFICIENT MOISTURE /SFC DEWPOINTS IN THE UPR 50S F AND PW AOA 1

INCH/ APPEARS PRESENT TO SUPPORT CONVECTION / PSBL STORMS GIVEN

CONTINUED LOW LVL CONVERGENCE AND INCREASING ASCENT / MID LVL

COOLING OVER THE NEXT SEVERAL HOURS.  SVR OR NEAR-SVR WIND GUSTS

WILL BE PSBL GIVEN 50+ KT LOW LVL FLOW.



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 300. MEAN STORM

MOTION VECTOR 24045.





...CORFIDI

