May 22- Tornado Watch #325

URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 325
   NWS STORM PREDICTION CENTER NORMAN OK
   130 PM CDT SUN MAY 22 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHWEST ARKANSAS
          SOUTHEAST KANSAS
          SOUTHWEST AND CENTRAL MISSOURI
          EASTERN OKLAHOMA
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900
   PM CDT.
   
   TORNADOES...HAIL TO 4 INCHES IN DIAMETER...THUNDERSTORM WIND
   GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
   AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
   MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF
   JEFFERSON CITY MISSOURI TO 30 MILES SOUTH OF MUSKOGEE OKLAHOMA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU5).
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND 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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 321...WW 322...WW
   323...WW 324...
   
   DISCUSSION...EXPLOSIVE TSTM DEVELOPMENT IS EXPECTED WITHIN THE NEXT
   ONE TO TWO HOURS ALONG COLD FRONT MOVING THROUGH SERN KS AND NERN
   OK.  WARM SECTOR AIR MASS IS QUITE MOIST WITH DEWPOINTS IN THE LOWER
   70S.  WHEN COUPLED WITH STEEP MIDLEVEL LAPSE RATES...ENVIRONMENT HAS
   BECOME STRONGLY TO EXTREMELY UNSTABLE WITH MLCAPE OF 3000-5000 J/KG.
   THE PRESENCE OF 35-40 KT WLY DEEP-LAYER SHEAR WILL BE SUPPORTIVE OF
   SUPERCELLS CAPABLE OF DESTRUCTIVE HAIL.  MOREOVER...SWRN EXTENSION
   OF A 30-35 KT SWLY LLJ WILL BE MAINTAINED ACROSS THE
   REGION...RESULTING IN EFFECTIVE SRH VALUES OF 150-250 M2/S2 AND AN
   ASSOCIATED TORNADO THREAT.  A STRONG TORNADO OR TWO IS POSSIBLE.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   600. MEAN STORM MOTION VECTOR 27025.