MESOSCALE DISCUSSION 0590
   NWS STORM PREDICTION CENTER NORMAN OK
   0736 PM CDT SUN APR 26 2009
   
   AREAS AFFECTED...E CNTRL MN AND W CNTRL WI
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 270036Z - 270130Z
   
   A BRIEF SVR WEATHER THREAT MAY EVOLVE DURING THE NEXT HR OR TWO OVER
   E CNTRL MN AND W CNTRL WI. A WW IS UNLIKELY DUE TO THE
   MARGINAL/ISOLATED NATURE OF THE THREAT.
   
   A SURFACE LOW HAS RAPIDLY DEVELOPED OVER SRN MN DURING THE LAST
   SEVERAL HRS...AND IS LIFTING N TOWARD E CNTRL MN. A WARM FRONT
   EXTENDS SE FROM THE LOW...WITH LOW 60S DEWPOINTS LOCATED ALONG AND S
   OF THE FRONT. MODIFIED RUC AND NAM FORECAST SOUNDINGS INDICATE THAT
   THE AIRMASS ALONG/S OF THE WARM FRONT MAY BRIEFLY YIELD SURFACE
   BASED CAPE VALUES OF 500 J/KG WITH MINIMAL CINH. STORMS FORMING IN
   THIS REGION WILL OCCUR WITHIN AN ENVIRONMENT CHARACTERIZED BY VERY
   STRONG LOW AND DEEP LAYER VERTICAL WIND SHEAR...SUFFICIENT FOR
   UPDRAFT ROTATION /IF A SURFACE BASED STORM MANAGES TO DEVELOP/. DUE
   TO WEAK MID LVL LAPSE RATES...THE PRIMARY SEVERE WEATHER THREAT
   WOULD BE A BRIEF TORNADO OR DAMAGING WIND GUST. DUE TO THE
   MARGINAL/CONDITIONAL NATURE OF THE THREAT...A WW DOES NOT APPEAR
   WARRANTED.
   
   ..GARNER.. 04/27/2009
   
   
   ATTN...WFO...MPX...
   
   LAT...LON   45579277 45009246 44389254 44259286 44159431 44559487
               45519472 45729352 45579277