SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 222
   NWS STORM PREDICTION CENTER NORMAN OK
   215 PM CDT THU APR 20 2006
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHEASTERN ARKANSAS
          NORTHEASTERN LOUISIANA
          NORTHERN MISSISSIPPI
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 215 PM UNTIL
   900 PM CDT.
   
   HAIL TO 2.5 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 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH OF
   MONTICELLO ARKANSAS TO 30 MILES NORTH NORTHEAST OF COLUMBUS
   MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
   
   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 219...WW 220...WW 221...
   
   DISCUSSION...SMALL CBS APPEAR SURFACE BASED WITHIN SURFACE
   CONVERGENCE MAXIMA OVER SERN AR AT 19Z.  AIR MASS DOWNSTREAM ACROSS
   NRN MS REMAINS VERY UNSTABLE AND WEAKLY CAPPED...SUGGESTING STORMS
   WILL CONTINUE INCREASING AS THEY SPREAD NEWD.  ADDITIONAL
   DEVELOPMENT SHOULD OCCUR AHEAD OF THESE STORMS ALONG STALLED OUTFLOW
   BOUNDARY EXTENDING NE-SW ACROSS NRN MS.  SHEAR REMAINS MORE THAN
   SUFFICIENT FOR SUPERCELLS... GIVEN 1500+ J/KG MLCAPE...AND LARGE
   HAIL/DAMAGING WINDS ARE EXPECTED TO ACCOMPANY STRONGER CELLS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 24025.
   
   
   ...EVANS