

076 

WWUS20 KWNS 281854

SEL8

SPC WW 281854

NCZ000-VAZ000-CWZ000-290200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 388

NWS STORM PREDICTION CENTER NORMAN OK

255 PM EDT FRI JUN 28 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHERN NORTH CAROLINA

  SOUTH-CENTRAL AND SOUTHEAST VIRGINIA

  COASTAL WATERS



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

  1000 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES SOUTHWEST OF

RALEIGH NORTH CAROLINA TO 60 MILES NORTH NORTHEAST OF RICHMOND

VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 385...WW 386...WW 387...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THROUGH THE REMAINDER OF THE AFTERNOON ALONG A LEE TROUGH

STRENGTHENING ALONG THE PIEDMONT.  HERE...THE AIR MASS HAS BECOME

UNCAPPED WITH MLCAPE VALUES AROUND 2000 J/KG.  THIS INSTABILITY

OVERLAPS WITH THE SRN EDGE OF A BELT OF RELATIVELY STRONG /50 KT/

MIDLEVEL FLOW ROTATING THROUGH THE BASE OF THE LARGE-SCALE TROUGH.

THE RESULTANT ENVIRONMENT IS SUPPORTIVE OF SUPERCELLS AND BOWING

STRUCTURES CAPABLE OF DAMAGING WINDS AND SOME HAIL.



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 27025.





...MEAD

