SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 637
   NWS STORM PREDICTION CENTER NORMAN OK
   710 PM CDT WED JUL 14 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN ARKANSAS
          THE MISSOURI BOOTHEEL
          NORTHERN MISSISSIPPI
          WEST TENNESSEE
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 710 PM
   UNTIL 100 AM 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 ALONG AND 80 STATUTE MILES
   NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHEAST OF TUPELO
   MISSISSIPPI TO 40 MILES SOUTH SOUTHWEST OF JONESBORO ARKANSAS.
   
   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 633...WW 634...WW 635...WW
   636...
   
   DISCUSSION...AREA WIND PROFILES AND INSTABILITY DISTRIBUTION SUGGEST
   THAT STORMS WILL BUILD WWD ALONG SWD-MOVING COLD FRONT CROSSING W
   TN/NE AR LATER THIS EVENING.  POTENTIAL WILL EXIST FOR HAIL AND HIGH
   WIND GIVEN RELATIVELY STEEP LOW TO MID LEVEL LAPSE RATES AND VERY
   MOIST BOUNDARY LAYER.
   
   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 550. MEAN STORM
   MOTION VECTOR 29025.
   
   
   ...CORFIDI