MESOSCALE DISCUSSION 0973
   NWS STORM PREDICTION CENTER NORMAN OK
   0231 PM CDT SUN JUN 07 2009
   
   AREAS AFFECTED...SWRN NEB PANHANDLE
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 071931Z - 072030Z
   
   AN ISOLATED TORNADO THREAT MAY CONTINUE FOR A HOUR OR SO AS A
   SHORT-LINE SEGMENT ALONG THE SERN WY/SWRN NEB PANHANDLE BORDER
   EVOLVES EWD. WITH SUBSTANTIAL WANING OF SURFACE-BASED INSTABILITY
   DOWNSTREAM...OVERALL TORNADIC POTENTIAL APPEARS TO BE MAXIMIZED ATTM
   AND SHOULD DIMINISH WITH TIME. THUS...A WW ISSUANCE IS NOT
   ANTICIPATED.
   
   JUST N OF WW 341...A SHORT/N-S ORIENTED LINE SEGMENT WAS LOCATED
   INVOF THE SERN WY/SWRN NEB PANHANDLE BORDER AS OF 1930Z. TWO OF THE
   CELLS WITHIN THIS LINE HAVE A REPORTED HISTORY OF PRODUCING
   TORNADOES. THIS THREAT APPEARS TO BE MAXIMIZED ATTM GIVEN AN
   EXTENSIVE STRATUS DECK THAT HAS REDEVELOPED DOWNSTREAM ACROSS THE
   SWRN NEB PANHANDLE. TIME-SERIES TRENDS AT SNY DEPICT FALLING
   TEMPERATURES AS CLOUDS HAD REDEVELOPED. THIS WILL HELP MINIMIZE
   ADDITIONAL DESTABILIZATION AMIDST ALREADY MARGINAL SURFACE-BASED
   INSTABILITY. NEVERTHELESS...STEEPER MID-LEVEL LAPSE RATES AND
   EFFECTIVE SHEAR AROUND 40-50 KT /AS SAMPLED BY 18Z DNR AND LBF
   RAOBS/ SHOULD SUPPORT A THREAT FOR SEVERE HAIL AS ACTIVITY SPREADS
   EWD AND BECOMES INCREASINGLY ROOTED ABOVE THE BOUNDARY LAYER.
   
   ..GRAMS.. 06/07/2009
   
   
   ATTN...WFO...LBF...BOU...CYS...
   
   LAT...LON   40980398 41000451 41210445 41710403 41910342 41940269
               41830227 41410205 40980211 40980398