MESOSCALE DISCUSSION 1224
   NWS STORM PREDICTION CENTER NORMAN OK
   0828 PM CDT WED JUN 20 2007
   
   AREAS AFFECTED...SRN MN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 430...
   
   VALID 210128Z - 210300Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 430
   CONTINUES.
   
   THROUGH 03Z...GREATEST SEVERE THREAT WILL EXIST FROM JUST S OF MSP
   TO NEAR AND W OF RST.  LARGE HAIL AND LOCALLY STRONG WIND GUSTS WILL
   REMAIN PRIMARY SEVERE WEATHER THREATS.
   
   AS OF 0115Z...RADAR IMAGERY INDICATED A SUPERCELL 30NE MKT MOVING
   320/30KT.  THIS STORM HAS FORMED WITHIN THE LAST HOUR ALONG SURGING
   OUTFLOW BOUNDARY ATTENDANT TO EARLIER SUPERCELL WHICH PRODUCED VERY
   LARGE HAIL OVER WRN PARTS OF THE MSP METRO AREA.  MODIFICATION OF
   00Z MSP SOUNDING FOR CURRENT SURFACE OBSERVATIONS S/SW OF THIS STORM
   SUGGEST THAT INFLOW AIR MASS STILL REMAINS MARGINALLY UNSTABLE WITH
   MLCAPES OF 700-800 J/KG BUT INCREASING CONVECTIVE INHIBITION.  
   
   EXPECT INSTABILITY TO FURTHER DECREASE AS BOUNDARY LAYER BEGINS TO
   COOL LATE THIS EVENING...ALONG WITH INCREASING CONVECTIVE
   INHIBITION.  AS SUCH...SEVERE THREAT WILL LIKELY CONTINUE THROUGH 
   03Z OR SO...MAINLY FROM RICE COUNTY SWD INTO STEELE AND PERHAPS
   DODGE COUNTIES IN SERN MN.  LARGE HAIL AND LOCALLY STRONG WIND GUSTS
   WILL REMAIN THE MAIN SEVERE WEATHER THREATS.
   
   ..MEAD.. 06/21/2007
   
   
   ATTN...WFO...ARX...MPX...
   
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