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Mesoscale Discussion 135
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   Mesoscale Discussion 0135
   NWS Storm Prediction Center Norman OK
   0456 PM CST Tue Jan 24 2017

   Areas affected...Portions of far northern IA...far southern MN...far
   southwest WI

   Concerning...Heavy snow 

   Valid 242256Z - 250400Z

   SUMMARY...A band of heavy snow will continue to become established
   and edge northward through the evening hours, with snowfall rates
   reaching around 1 inch per hour.

   DISCUSSION...Satellite and radar imagery, and surface observations,
   suggest that a midlevel deformation zone, and related zonally
   elongated shield of moderate to locally heavy snow, are
   consolidating across far northern IA. This activity is also being
   supported by incipient warm-advection-related precipitation farther
   south, and lies ahead of a vorticity maximum crossing eastern NE.
   The deformation zone will gradually edge northward in tandem with
   vorticity-maximum-preceding poleward mass fluxes. As such, the
   leading edge of related banded snow will slowly shift into far
   southern MN in the 2330Z-0100Z time frame. The progression of the
   vorticity maximum should allow this activity to advance into far
   southwest WI after 0300Z. Adequate frontogenetic ascent embedded
   within the deformation zone will favorably intersect saturated
   dendritic growth zones aloft in support of snowfall rates to 1 inch
   per hour. This activity will likely persist into the evening 
   hours -- perhaps into the overnight hours especially toward the
   vicinity of the Mississippi River.

   ..Cohen.. 01/24/2017


   LAT...LON   42959054 42959305 43079575 43449613 43759519 43939299
               43759109 43278994 42959054 

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