MESOSCALE DISCUSSION 1878
   NWS STORM PREDICTION CENTER NORMAN OK
   1106 PM CDT SAT AUG 06 2011
   
   AREAS AFFECTED...PORTIONS NRN MO...SRN IA...WRN IL.
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 732...733...
   
   VALID 070406Z - 070600Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   732...733...CONTINUES.
   
   QLCS WILL CONTINUE TO MOVE EWD ACROSS S-CENTRAL/SERN IA AND ADJACENT
   PORTIONS EXTREME NRN MO...WITH POTENTIAL FOR ADDITIONAL DAMAGING
   WINDS EWD ACROSS MS RIVER INTO NRN/WRN IL.  58 KT GUST WAS MEASURED
   IN UNION COUNTY IA AT 350Z...ALONG WITH TREES ON HOUSES AND
   ESTIMATED GUSTS NEAR 60 KT IN CLARKE COUNTY IA AT 342Z. 
   
   SFC ANALYSIS SHOWS BROAD FIELD OF FAVORABLE MOISTURE IN PROSPECTIVE
   PATH OF COMPLEX...WITH SFC DEW POINTS COMMONLY 70S F CONTRIBUTING TO
   MLCAPE 2000-3000 J/KG BASED ON MODIFIED RAOBS AND RUC SOUNDINGS. 
   GIVEN RICHNESS OF BOUNDARY-LAYER MOISTURE...DIABATIC COOLING WILL BE
   GRADUAL...WITH EFFECTIVE INFLOW PARCELS REMAINING SFC-BASED OR VERY
   NEARLY SO FOR SEVERAL MORE HOURS.  AS SUCH...FORCED ASCENT TO LFC
   WILL BE RATHER EASY FOR COLD POOL TO ACCOMPLISH...WHILE N-S
   ALIGNMENT OF MCS REMAINS ROUGHLY ORTHOGONAL TO DEEP-LAYER MEAN WIND
   AND DEEP-SHEAR VECTORS.
   
   MEANWHILE...PREVIOUSLY SVR WIND-PRODUCING CONVECTION THAT HAS MOVED
   ACROSS OMA AREA INTO IA APPEARS TO BE WEAKENING...WITH DAMAGING WIND
   THREAT DIMINISHING EWD.  THIS TREND IS FCST TO CONTINUE...GIVEN
   INCREASING DEPTH/STRENGTH OF COLD POOL OVER WHICH IT IS PASSING. 
   THIS SHOULD PERMIT REMAINING PORTIONS WW 732 TO BE CLEARED BEFORE
   SCHEDULED 06Z EXPIRATION...OR EXPIRE AS SCHEDULED.
   
   ..EDWARDS.. 08/07/2011
   
   
   ATTN...WFO...ILX...LSX...DVN...DMX...EAX...OAX...
   
   LAT...LON   39559068 40029428 40729587 41499542 41639406 41469052
               40579014 39559068