

863 

WWUS20 KWNS 041730

SEL1

SPC WW 041730

NCZ000-CWZ000-050000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 241

NWS STORM PREDICTION CENTER NORMAN OK

130 PM EDT MON MAY 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN NORTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 800

PM EDT.



HAIL TO 1.5 INCHES 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 105

STATUTE MILES EITHER SIDE OF A LINE FROM 5 MILES NORTH OF ROANOKE

RAPIDS NORTH CAROLINA TO 40 MILES WEST SOUTHWEST OF NEW BERN

NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 238...WW 239...WW 240...



DISCUSSION...LEE/THERMAL TROUGHING TRAILING SWWD FROM THE LOW/WARM

FRONT OVER VA WILL DEVELOP EWD INTO INCREASINGLY UNSTABLE AIR MASS

ACROSS ERN NC THIS AFTERNOON. LOW LEVEL CONVERGENCE AND LIFT ALONG

THESE SWWD TRAILING AND EWD MOVING BOUNDARIES WILL BE SUFFICIENT FOR

CONTINUED ISOLATED TO SCATTERED THUNDERSTORM DEVELOPMENT. EFFECTIVE

DEEP-LAYER SHEAR ON THE ORDER OF 30KT AND EXPECTED CELLULAR

DEVELOPMENT SHOULD FAVOR SUPERCELLS WITH ATTENDANT THREATS OF HAIL

AND HIGH WINDS.



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 450. MEAN STORM

MOTION VECTOR 26035.





...CARBIN

