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Mesoscale Discussion 67
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   Mesoscale Discussion 0067
   NWS Storm Prediction Center Norman OK
   0747 PM CST Tue Jan 17 2017

   Areas affected...Eastern Washington...North-central/Northeast Oregon

   Concerning...Freezing rain 

   Valid 180147Z - 180745Z

   SUMMARY...Mixed precipitation will overspread the area this evening.
   Snow and sleet will be possible across the northern portion of the
   area initially, while freezing rain is expected to become
   established further south, with rates around 0.05 inches per hour
   possible.

   DISCUSSION...At 0130Z, a large precipitation shield is beginning to
   spread east of the Cascades into portions of eastern Washington and
   northern Oregon. With very cold temperatures in the 15-25F range
   currently in place, an initial precipitation type of snow or sleet
   is possible, especially across the northern portion of the MCD area
   where a less substantial warm nose is in place. However, continued
   warm advection above an increasingly shallow subfreezing layer will
   eventually result in a changeover to freezing rain across the bulk
   of the MCD area, such as what has already occurred around Yakima.
   Freezing rain rates of up to 0.05 inches per hour will be possible,
   with ice accretion likely to be rather efficient given the
   antecedent cold airmass that is in place.

   ..Dean.. 01/18/2017


   ATTN...WFO...OTX...PDT...

   LAT...LON   46352065 46942056 47432023 47961965 48051878 47981806
               47601732 46621765 45961815 45811827 45541872 45421907
               45421940 45401994 45602037 46352065 

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