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Mesoscale Discussion 32
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   Mesoscale Discussion 0032
   NWS Storm Prediction Center Norman OK
   0307 PM CST Wed Jan 11 2017

   Areas affected...Southern WI and far northwestern IL

   Concerning...Winter mixed precipitation 

   Valid 112107Z - 120100Z

   SUMMARY...A mix of freezing rain, sleet, and snow is anticipated
   over the next few hours across portions of southern WI and far
   northwestern IL. Freezing rain rates could briefly approach 0.05
   inch per hour with transient snowfall rates near 1 inch per hour
   also possible farther north of the transition zone.

   DISCUSSION...Recent surface analysis places a cold front from near
   the easternmost WI/IL border southwestward through central MO and
   into southeastern KS. Southwesterly flow aloft continues above this
   frontal zone, with the resulting isentropic lift supporting the
   development of precipitation across eastern IA, southern WI, and
   northwestern IL. This process is expected to continue, with the
   light precipitation acting to moisten the mid-level dry layer noted
   on recent RAP forecast soundings. Once this dry layer is overcome,
   more substantial precipitation will begin to reach the surface, with
   profiles across southern portions of the area currently supporting a
   mix of freezing rain and sleet. Freezing rain rates may briefly
   exceed 0.05 inch per hour. Farther north, colder profiles will
   result in snow as the primary precipitation type, with snowfall
   rates briefly exceeding one inch per hour possible.

   ..Mosier.. 01/11/2017


   LAT...LON   43378780 43028819 42648929 42349032 42499066 42999079
               43918977 44688749 43948769 43378780 

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