MESOSCALE DISCUSSION 1831
   NWS STORM PREDICTION CENTER NORMAN OK
   0852 PM CDT SAT AUG 08 2009
   
   AREAS AFFECTED...E-CNTRL MN INTO W-CNTRL WI
   
   CONCERNING...TORNADO WATCH 678...
   
   VALID 090152Z - 090315Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 678 CONTINUES.
   
   TORNADIC SUPERCELL WHICH RECENTLY DEVELOPED OVER THE MINNEAPOLIS
   METRO AREA WILL LIKELY CONTINUE TO POSE A TORNADO THREAT WHILE
   PROGRESSING NEWD TOWARD THE ST. CROIX RIVER.
   
   A TORNADIC SUPERCELL HAS RAPIDLY DEVELOPED NEAR SYNOPTIC SURFACE LOW
   INVOF MSP.  WHILE CURRENT MSP VWP INDICATES ONLY MODEST LOW-LEVEL
   SHEAR...EARLIER ELEVATED TSTMS HAVE RE-ESTABLISHED EFFECTIVE WARM
   FRONT FARTHER TO THE S...GENERALLY FROM THE N SIDE OF MSP EWD TO
   NEAR OR JUST N OF EAU.  SUPERCELL WILL LIKELY CONTINUE ENEWD ALONG
   THIS BOUNDARY...INGESTING A VORTICITY RICH LOCAL ENVIRONMENT.  THIS
   CORRIDOR OF ENHANCED LOW-LEVEL SHEAR COINCIDES WITH A MODERATE TO
   STRONGLY UNSTABLE AIR MASS /MLCAPE OF 3000-3500 J PER KG/ WHICH
   SHOULD MAINTAIN CURRENT ACTIVITY WITH A CONTINUED THREAT OF
   TORNADOES IN ADDITION TO LARGE HAIL AND LOCALLY DAMAGING WIND GUSTS.
   
   ..MEAD.. 08/09/2009
   
   
   ATTN...WFO...MPX...
   
   LAT...LON   44929317 45319317 45499268 45519181 45159130 44809159
               44729264 44779289 44929317