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Mesoscale Discussion 164
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   Mesoscale Discussion 0164
   NWS Storm Prediction Center Norman OK
   1159 PM CST Wed Feb 08 2017

   Areas affected...East-central WA

   Concerning...Freezing rain 

   Valid 090559Z - 090800Z

   SUMMARY...Ongoing freezing rain, with rates around 0.01 to 0.03 an
   hour, is expected to transition to rain within the next hour or two.

   DISCUSSION...Surface observations across the region indicate ongoing
   freezing rain across the region with rates 0.01" to 0.03" an hour.
   Areal extent of the precipitation upstream has increased over the
   past hour as warm-air advection continues ahead of the approaching
   upper system. Recent KOTX radar imagery shows a
   correlation-coefficient signal consistent with a melting layer
   increasing in height over the past half an hour. The increased depth
   of this warm layer and a related increase in surface temperatures
   suggests the upstream precipitation will likely begin to transition
   from freezing rain to predominately rain within the next hour or
   two.

   ..Mosier.. 02/09/2017


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

   LAT...LON   47391966 47771890 47971774 47831711 47291684 46951711
               46511813 46531892 46691957 47391966 

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Page last modified: February 09, 2017
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