MESOSCALE DISCUSSION 1082
   NWS STORM PREDICTION CENTER NORMAN OK
   0532 PM CDT FRI JUN 12 2009
   
   AREAS AFFECTED...NERN KS...NWRN MO...FAR SRN IA...FAR SERN NEB
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 122232Z - 122330Z
   
   AT LEAST A SHORT-TERM THREAT FOR A FEW SUPERCELLS IS EXPECTED ALONG
   PORTIONS OF THE LOWER TO MID-MO RIVER VALLEY. OBSERVATIONAL TRENDS
   ARE BEING CLOSELY MONITORED FOR THE POSSIBILITY OF A WW.
   
   RECENT RADAR IMAGERY DEPICTS CONVECTION INCREASING IN OVERALL
   COVERAGE NEAR THE JUXTAPOSITION OF NERN KS/NWRN MO/SERN NEB/SWRN
   IA...IN ASSOCIATION WITH A MID-LEVEL IMPULSE CROSSING MID-MO RIVER
   VALLEY. WITH SURFACE TEMPERATURES WARMING TO NEAR 80 F AND DEW
   POINTS HOLDING IN THE LOWER 60S...MLCAPE OF 500 TO 1500 J/KG WAS
   COMMON. INSTABILITY SHOULD REMAIN LIMITED BY THE PRESENCE OF POOR
   MID-LEVEL LAPSE RATES /PER MODIFIED FORECAST SOUNDINGS AND 12Z
   RAOBS/. NEVERTHELESS...A BAND OF STRONG MID-LEVEL WLYS /AROUND 50 KT
   PER AREA PROFILERS/ WILL BE FAVORABLE FOR UPDRAFT ROTATION. ALTHOUGH
   LOW-LEVEL FLOW SHOULD REMAIN MODEST...PRESENCE OF BACKED SELYS WILL
   ENHANCE HODOGRAPH SHAPE DOWNSTREAM OF WEAK SURFACE CYCLONE /ANALYZED
   AROUND 30 NW FNB AT 22Z/. MARGINALLY SEVERE HAIL AND PERHAPS A BRIEF
   TORNADO ARE EXPECTED TO BE THE PRIMARY THREATS.
   
   ..GRAMS.. 06/12/2009
   
   
   ATTN...WFO...DMX...EAX...OAX...TOP...
   
   LAT...LON   40889387 40259312 39709326 38779383 38469423 38389519
               38569600 39119647 40209612 40879562 40889387