MESOSCALE DISCUSSION 2341
   NWS STORM PREDICTION CENTER NORMAN OK
   0611 AM CST SAT NOV 19 2011
   
   AREAS AFFECTED...CNTRL AND NE SD...CNTRL MN AND NRN WI
   
   CONCERNING...HEAVY SNOW 
   
   VALID 191211Z - 191615Z
   
   MODERATE TO HEAVY SNOWFALL WILL SPREAD ENEWD FROM CNTRL SD THIS
   MORNING INTO CNTRL MN AND NRN WI THIS AFTERNOON. SNOWFALL RATES OF 1
   INCH PER HOUR WILL BE LIKELY WITHIN THE MORE INTENSE PARTS OF THE
   SNOWBAND.
   
   WATER VAPOR CURRENTLY SHOWS A SHORTWAVE TROUGH MOVING ENEWD THROUGH
   WRN SD IN STRONG SOUTHWEST FLOW ALOFT. AHEAD OF THIS
   DISTURBANCE...THE MODELS SHOW A STRONG ZONE OF ISENTROPIC
   LIFT/FRONTOGENESIS FROM CNTRL SD ENEWD INTO CNTRL MN. ALONG THIS
   CORRIDOR...A NEARLY SATURATED AIRMASS EXISTS WHICH COMBINED WITH
   ENHANCED LIFT ASSOCIATED WITH THE FEATURES PREVIOUSLY MENTIONED WILL
   HELP CREATE CONDITIONS FAVORABLE FOR STRONG DENDRITIC GROWTH. IN
   RESPONSE...A BAND OF HEAVY SNOWFALL ABOUT 50 STATUTE MILES WIDE
   ACROSS CNTRL AND NERN SD WILL GRADUALLY INTENSIFY THIS MORNING.
   SNOWFALL RATES OF 1 INCH PER HOUR WILL BE POSSIBLE IN THE MOST
   INTENSE SECTIONS OF THE BAND WITH THE HEAVIEST SNOWFALL RATES
   TRANSITIONING ENEWD FROM CNTRL-NERN SD INTO CNTRL MN BY LATE THIS
   MORNING.
   
   ..BROYLES.. 11/19/2011
   
   
   ATTN...WFO...DLH...MPX...FGF...FSD...ABR...
   
   LAT...LON   44339857 43950036 44190092 44750099 45230031 46079728
               46699350 46839166 46639100 46079083 45709139 45299383
               45099485 44339857