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Mesoscale Discussion 66
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   Mesoscale Discussion 0066
   NWS Storm Prediction Center Norman OK
   0851 AM CST Fri Jan 14 2022

   Areas affected...Southeast North Dakota...eastern South
   Dakota...Southwest Minnesota...Most of Iowa...and far eastern

   Concerning...Heavy snow 

   Valid 141451Z - 141745Z

   SUMMARY...Mostly moderate snow with occasionally heavy snow and
   rates up to 1 inch per hour expected. Some mixed precipitation
   possible across mainly eastern Nebraska and southwest Iowa.

   DISCUSSION...A broad region of isentropic ascent is present across
   the northern Plains and Upper Midwest. As a result, a precipitation
   shield has developed and will persist for much of the day. A dry
   low-level airmass is in place, as evidenced by the OAX and TOP 12Z
   RAOB which is limiting the overall precipitation rates, especially
   across eastern Nebraska and southwest Iowa. The column is expected
   to continue to saturate through the day which should lead to a more
   uniform precipitation shield by this evening. A mix of freezing rain
   and sleet is occurring across southeast South Dakota, eastern
   Nebraska and southwest Iowa. Continued low-level warm air advection
   is expected to increase surface temperatures a few degrees and thus,
   the icing threat is expected to diminish with mostly rain across
   southeast Iowa and Nebraska and moderate snow developing to the
   northeast. Heavier snowfall rates in excess of 1 inch per hour are
   most likely later today across portions of central and southern Iowa
   as the moisture profile improves.

   ..Bentley.. 01/14/2022

   ...Please see for graphic product...


   LAT...LON   46069786 46359711 46469645 46379591 45919531 44519376
               42069229 41449256 41369302 40889420 40899537 41459628
               42539694 43959744 45059811 45669827 46069786 

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