SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 131
   NWS STORM PREDICTION CENTER NORMAN OK
   115 PM CDT SUN APR 2 2006
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTH-CENTRAL AND SOUTHWESTERN IOWA
          EXTREME NORTHEASTERN KANSAS
          NORTHWESTERN MISSOURI
   
   EFFECTIVE THIS SUNDAY AFTERNOON FROM 115 PM UNTIL 500 PM CDT.
   
   HAIL TO 2 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 85
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTHWEST OF
   SHENANDOAH IOWA TO 25 MILES SOUTHEAST OF LAMONI IOWA.  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 129...WW 130...
   
   DISCUSSION...HAIL POTENTIAL IS EXPECTED TO SHIFT ENEWD ACROSS WW
   AREA THROUGH 21-22Z TIME FRAME AS WARM FRONT LIFTS NWD INTO SWRN IA.
    AIR MASS ALONG/S OF FRONT SHOULD CONTINUE TO DESTABILIZE WITH
   COMBINATION OF WAA AND DIABATIC SFC HEATING...WHILE LAPSE RATES
   ALOFT STEEPEN WITH PROXIMITY TO MIDLEVEL THERMAL TROUGH.  DEEP-LAYER
   SHEAR FAVORS ENOUGH ORGANIZATION FOR CONTINUED...AND PERHAPS
   INCREASED...THREAT OF LARGE HAIL INTO LATE AFTERNOON.  DAMAGING
   GUSTS ALSO ARE POSSIBLE...MAINLY S OF WARM FRONT.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
   MOTION VECTOR 26030.
   
   
   ...EDWARDS/thompson