MESOSCALE DISCUSSION 1685
   NWS STORM PREDICTION CENTER NORMAN OK
   0318 PM CDT WED AUG 08 2007
   
   AREAS AFFECTED...SERN NEB...NERN KS...NWRN MO...SWRN IA...
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 082018Z - 082145Z
   
   AT LEAST ISOLATED DEVELOPMENT IS LIKELY BY LATE AFTERNOON AND A WW
   MAY BE REQUIRED. 
   
   OUTFLOW BOUNDARY EXTENDING FROM JUST E OF HSI TO NEAR STJ IS
   BEGINNING TO MIX OUT WITH A VERY HOT AND EXTREMELY UNSTABLE AIR MASS
   SPREADING NWD OUT OF KS. AREA PROFILERS INDICATE 150-250 M2/S2 0-3KM
   SRH ALONG THIS OUTFLOW BOUNDARY. HOWEVER...PROFILERS ALSO INDICATE
   WINDS ALOFT ARE VEERING WITH TIME...LIKELY DUE TO DEPARTURE OF
   CONVECTIVE SYSTEMS IN NERN NEB AND SRN IA. THIS CALLS INTO QUESTION
   OVERALL FORCING REGIME. HOWEVER...LOCAL RADARS SHOW LOW LEVEL
   CIRCULATION NEAR HSI...ALONG OUTFLOW BOUNDARY/COLD FRONT
   INTERSECTION. GIVEN CONTINUED HEATING...MIXING OUT OF CIN AND SWLY
   LLJ...SEVERE STORMS ARE EXPECTED ALONG THIS OUTFLOW BOUNDARY.
   ADDITIONAL STORMS MAY FORM FARTHER SW AS WELL ALONG COLD
   FRONT...WHERE VISIBLE IMAGERY SHOWS EXPANDING CU FIELD.
   SUPERCELLS...WITH HAIL/WIND/POSSIBLE BRIEF TORNADOES...WOULD BE
   LIKELY INITIALLY ALONG THE OUTFLOW BOUNDARY...BUT WOULD LIKELY
   TRANSITION TO MORE OF AN MCS WITH HEAVY RAIN THREAT.
   
   ..JEWELL.. 08/08/2007
   
   
   ATTN...WFO...DMX...EAX...OAX...TOP...GID...
   
   40479435 40309417 40059392 39859396 39549430 39269453
   39179474 39149539 39249631 39429666 39709777 39909819
   40399848 40959856 41259815 41289731 41199667 40919557
   40729508