MESOSCALE DISCUSSION 1221
   NWS STORM PREDICTION CENTER NORMAN OK
   0446 PM CDT TUE JUN 14 2011
   
   AREAS AFFECTED...CENTRAL SD SWD INTO NRN/CENTRAL NEB
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 142146Z - 142245Z
   
   THUNDERSTORMS....WITH SEVERE HAIL...WILL BE POSSIBLE THE NEXT FEW
   HOURS FROM CENTRAL SD SWD INTO NRN/CENTRAL NEB. THE THREAT IS
   CURRENTLY EXPECTED TO BE TOO ISOLATED FOR A WW.
   
   THUNDERSTORMS WERE LOCATED ALONG AN INVERTED TROUGH AND AHEAD OF A
   SHORTWAVE TROUGH MOVING EWD THROUGH WRN NEB/SD. ALTHOUGH A NARROW
   WEDGE OF MODERATELY INSTABILITY EXISTS AHEAD OF THE TROUGH IN
   SD...THESE STORMS SHOULD SLOWLY WEAKEN AS THEY SHIFT EWD
   INTO A CLOUDIER AND MORE STABLE AIR MASS LOCATED ACROSS ERN SD.
   
   STRONGER HEATING HAS RESULTED IN GREATER INSTABILITY IN NRN NEB AND
   STORMS MOVING INTO THIS REGION WILL HAVE A GREATER POTENTIAL FOR
   HAIL...SOME GREATER THAN 1 INCH IN DIAMETER. HOWEVER...THE 
   RELATIVELY WEAK SHEAR IN THE 20-30 KT RANGE AND EXPECTED SMALL AREA
   OF STORMS PROBABLY PRECLUDES A WATCH ISSUANCE.
   
   ..IMY.. 06/14/2011
   
   
   ATTN...WFO...FSD...OAX...ABR...GID...LBF...
   
   LAT...LON   44379926 45089911 45549863 45379809 44769830 43729831
               42669799 41699726 41189725 40819784 40839895 40939976
               41550084 41960129 42570143 42900114 42959940 44379926