

836 

WWUS20 KWNS 192232

SEL4

SPC WW 192232

MDZ000-NCZ000-SCZ000-VAZ000-CWZ000-200700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 134

NWS STORM PREDICTION CENTER NORMAN OK

630 PM EDT FRI APR 19 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN SHORE OF MARYLAND

  EASTERN NORTH CAROLINA

  NORTHEAST SOUTH CAROLINA

  SOUTHEAST VIRGINIA

  COASTAL WATERS



* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 630 PM

  UNTIL 300 AM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

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

WALLOPS VIRGINIA TO 25 MILES SOUTH SOUTHEAST OF MYRTLE BEACH

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 129...WW 130...WW

131...WW 132...WW 133...



DISCUSSION...CONVECTION IS GRADUALLY ORGANIZING INTO MORE OF A QLCS

ACROSS THE CENTRAL CAROLINAS/VA...AND THIS CONVECTIVE MODE SHOULD

PERSIST THROUGH THE EVENING AS CONVECTION PROGRESSES EWD TOWARD THE

ATLANTIC COAST.  LOW-MIDLEVEL VERTICAL SHEAR WILL BE STRONG ENOUGH

TO SUPPORT CONTINUED ORGANIZED STORM STRUCTURES.  OTHER THAN SOME

STABILIZING INFLUENCE OF THE COOLER NEAR-SHORE WATERS /ESP N OF CAPE

HATTERAS/...SUFFICIENT INSTABILITY IS EXPECTED TO PERSIST INLAND TO

MAINTAIN THE SEVERE STORM RISK TO THE COAST.  DAMAGING GUSTS WILL BE

THE MOST COMMON RISK WITH EMBEDDED BOWING SEGMENTS...AND ISOLATED

LARGE HAIL COULD OCCUR WITH THE STRONGEST STORMS MAINLY IN THE WRN

PART OF THE WATCH THIS EVENING.  OTHERWISE...A BRIEF SPIN UP OR TWO

CANNOT BE RULED OUT WITH CIRCULATIONS IN THE BROADER QLCS.



AVIATION...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 25035.





...THOMPSON

