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Mesoscale Discussion 69
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   Mesoscale Discussion 0069
   NWS Storm Prediction Center Norman OK
   0600 AM CST Wed Jan 18 2017

   Areas affected...Central Washington and North-central Oregon

   Concerning...Freezing rain 

   Valid 181200Z - 181500Z

   SUMMARY...Scattered light freezing rain will continue to affect
   parts of the Columbia and Yakima valleys this morning, before
   gradual warming ends the threat in a few hours.

   DISCUSSION...Radar loops show another area of light to moderate rain
   spreading across the Cascades and into central WA/north-central OR. 
   This precipitation appears to be associated with an embedded
   shortwave trough approaching the WA coast.  The rain will develop
   eastward into the Columbia and Yakima valleys this morning, where
   surface temperatures remain well below freezing.  This will result
   in additional glazing of up to 0.10 inches.  Forecast soundings in
   this area suggest that only the lowest elevations will be at risk
   for freezing rain, as temperatures warm above 0C at just a few
   hundred feet agl above the valley bottom.  Surface temperatures are
   expected to warm rapidly after sunrise, which should bring an end to
   threat in most areas.

   ..Hart.. 01/18/2017


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

   LAT...LON   46572138 47422105 47642014 47621922 47071876 46751853
               46161832 45811864 45371961 45262097 45732129 46572138 

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Page last modified: January 18, 2017
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