MESOSCALE DISCUSSION 1219
   NWS STORM PREDICTION CENTER NORMAN OK
   0400 PM CDT WED JUN 20 2007
   
   AREAS AFFECTED...CENTRAL MN
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 202100Z - 202200Z
   
   CENTRAL MN CONTINUING TO BE MONITORED FOR A POTENTIAL WW.
   
   SURFACE ANALYSIS SHOWED A COLD FRONT MOVING SLOWLY SWD THROUGH
   CENTRAL MN AND NERN SD...WITH THIS PART OF THE FRONT HAVING WEAKER
   CONVERGENCE AS STRONGER FORCING FOR ASCENT IS SPREADING SEWD ACROSS
   NRN WI AND THE UPPER PENINSULA OF MI.  OBJECTIVE ANALYSES INDICATED
   MODERATE INSTABILITY OVER CENTRAL MN WITH EFFECTIVE BULK SHEAR OF
   35-50 KT...WITH THESE VALUES SUFFICIENT FOR ORGANIZED STORMS. 
   HOWEVER...THE WEAKER LOW LEVEL CONVERGENCE ALONG THE FRONT AND LESS
   UPPER FORCING APPEAR TO BE THE LIMITING FACTORS THUS FAR FOR MORE
   ROBUST UPDRAFTS.  ACARS SOUNDINGS FROM MSP AT 19Z INDICATED A MID
   LEVEL INVERSION WAS CONTINUING TO WEAKEN.  THIS COMBINED WITH 18Z
   RUC/NAM BOTH INDICATING POTENTIAL FOR CONVECTIVE DEVELOPMENT ALONG
   THE MN PART OF THE COLD FRONT BETWEEN 21-00Z SUGGESTS WW REMAINS
   POSSIBLE FOR CENTRAL MN.
   
   ..PETERS.. 06/20/2007
   
   
   ATTN...WFO...DLH...MPX...FGF...FSD...ABR...
   
   46089297 45069279 44659337 44609585 44679642 45189687
   45839663 46029505