MESOSCALE DISCUSSION 1326
   NWS STORM PREDICTION CENTER NORMAN OK
   0433 PM CDT MON JUN 20 2011
   
   AREAS AFFECTED...CNTRL SD
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 202133Z - 202300Z
   
   A MARGINAL TORNADO THREAT MAY DEVELOP ALONG AN INVERTED TROUGH
   ACROSS CNTRL SD. AREA IS BEING MONITORED FOR A POSSIBLE WW.
   
   21Z SUBJECTIVE SURFACE ANALYSIS PLACED A 992 MB CYCLONE NEAR THE
   S-CNTRL NEB/N-CNTRL KS BORDER WITH AN INVERTED TROUGH EXTENDING NWD
   TO A MESOLOW NEAR K9V9. SMALL CLUSTER OF TSTMS INVOF THE MESOLOW
   COULD STRENGTHEN GIVEN A WEDGE OF CLEARING/GREATER DESTABILIZATION
   OVER E-CNTRL SD JUST AHEAD OF STRATUS DECK LIFTING NWD ACROSS SERN
   SD. A HIGHLY VEERING LOW/MID-LEVEL WIND PROFILE SUPPORTING EFFECTIVE
   SHEAR OF 30 TO 35 KT MAY BE SUFFICIENT FOR A NARROW CORRIDOR OF
   UPDRAFT ORGANIZATION AND PERHAPS A FEW FUNNELS/WEAK TORNADOES.
   
   ..GRAMS.. 06/20/2011
   
   
   ATTN...WFO...FSD...ABR...LBF...UNR...
   
   LAT...LON   42819951 43870006 44780040 45230049 45440029 45609975
               45199931 44399874 43529863 43119883 42819951