MESOSCALE DISCUSSION 1562
   NWS STORM PREDICTION CENTER NORMAN OK
   0639 PM CDT TUE JUL 14 2009
   
   AREAS AFFECTED...ERN/SRN MN...WRN WI
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 583...
   
   VALID 142339Z - 150045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 583
   CONTINUES.
   
   ...NEW WW IS NOT ANTICIPATED DOWNSTREAM ACROSS ERN MN AND WRN WI...
   
   GRADUALLY EXPANDING THUNDERSTORM CLUSTER IS MOVING NEWD ACROSS CNTRL
   MN TOWARD WRN PORTIONS OF LAKE SUPERIOR.  THIS ACTIVITY WILL SOON
   SPREAD ATOP CONSIDERABLY MORE STABLE BOUNDARY LAYER CHARACTERIZED BY
   SFC TEMPERATURES PRIMARILY IN THE 60S.  LATEST DIAGNOSTIC DATA
   SUGGESTS INSTABILITY DROPS OFF CONSIDERABLY OVER ERN MN WITH LESS
   THAN 500 J/KG MLCAPE NEAR THE MS RIVER.  FOR THIS REASON IT APPEARS
   UPDRAFT INTENSITY SHOULD GRADUALLY DECREASE...THOUGH OVERALL COMPLEX
   OF STORMS WILL LIKELY SPREAD WELL DOWNSTREAM...DRIVEN INCREASINGLY
   BY ISENTROPIC ASCENT ACROSS THE UPPER GREAT LAKES REGION.  OTHER
   STORMS MAY YET DEVELOP SOUTH ACROSS SERN MN AS LARGE SCALE SUPPORT
   AHEAD OF UPPER TROUGH INTERACTS WITH ERN PLUME OF INSTABILITY.
   
   ..DARROW.. 07/14/2009
   
   
   ATTN...WFO...DLH...ARX...MPX...FSD...
   
   LAT...LON   43739511 45139422 46389431 46809228 44919166 43609296
               43739511