MESOSCALE DISCUSSION 0304
   NWS STORM PREDICTION CENTER NORMAN OK
   0126 PM CDT WED MAR 21 2007
   
   AREAS AFFECTED...NWRN IL INTO SRN WI
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 211826Z - 211930Z
   
   THE POTENTIAL FOR ISOLATED SEVERE WEATHER WILL EXIST E OF WW 63 THIS
   AFTERNOON.  THIS THREAT IS EXPECTED TO REMAIN MARGINAL AND AN
   ADDITIONAL WW IS NOW NOT ANTICIPATED.
   
   18Z DVN SOUNDING INDICATES THAT CONSIDERABLE MOISTENING HAS OCCURRED
   BELOW 700 MB OVER THE PAST 6 HOURS...HOWEVER ENVIRONMENT REMAINS
   LESS UNSTABLE THAN THAT OBSERVED OVER WRN IA EARLIER THIS MORNING
   /REF. 12Z OAX SOUNDING/.  MOREOVER...ONGOING TSTMS HAVE TENDED TO
   MERGE INTO A LARGER CLUSTER WITH INDIVIDUAL UPDRAFT CORES GENERALLY
   WEAKENING.  WHILE SOME POTENTIAL FOR MARGINALLY SEVERE HAIL AND
   LOCALLY DAMAGING WINDS WILL EXIST WITH THE STRONGER EMBEDDED
   STORMS...THE POTENTIAL FOR AN ORGANIZED SEVERE WEATHER THREAT
   APPEARS TOO LOW TO WARRANT THE ISSUANCE OF AN ADDITIONAL WW ATTM.
   
   ..MEAD.. 03/21/2007
   
   
   ATTN...WFO...LOT...ILX...MKX...DVN...ARX...
   
   42629066 42939054 43189010 43288928 43078882 42378853
   41398941 41099007 40609063 40649090 41289087