

752 

WWUS20 KWNS 191638

SEL9

SPC WW 191638

FLZ000-GAZ000-SCZ000-CWZ000-200000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 129

NWS STORM PREDICTION CENTER NORMAN OK

1240 PM EDT FRI APR 19 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN PANHANDLE OF FLORIDA

  CENTRAL...EASTERN AND SOUTHERN GEORGIA

  WEST-CENTRAL SOUTH CAROLINA

  COASTAL WATERS



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL

  800 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHWEST OF

AUGUSTA GEORGIA TO 35 MILES SOUTH SOUTHWEST OF TALLAHASSEE

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



&&



DISCUSSION...TSTMS FCST TO CONTINUE INCREASING IN INTENSITY AND

COVERAGE ALONG/AHEAD OF SFC COLD FRONT...AS

1. BOUNDARY-LAYER AIR MASS DIABATICALLY DESTABILIZES...WITH RICH

THETAE OFFSETTING WEAK LAPSE RATES ALOFT...AND

2. FAVORABLE DEEP-LAYER SHEAR SPREADS EWD OVER AREA ACROSS IMMEDIATE

PREFRONTAL CORRIDOR.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 24035.





...EDWARDS

