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Mesoscale Discussion 29
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   Mesoscale Discussion 0029
   NWS Storm Prediction Center Norman OK
   1120 AM CST Sat Jan 07 2017

   Areas affected...Western OR and southwest WA

   Concerning...Winter mixed precipitation 

   Valid 071720Z - 072315Z

   SUMMARY...Light to moderate freezing rain will persist across the
   southern Willamette Valley this afternoon with sleet and freezing
   rain expected to spread/develop north into portions of southwest WA
   later this afternoon.

   DISCUSSION...Precipitation is gradually spreading north across OR
   ahead of a notable short-wave trough that is quickly approaching the
   coast.  Latest water vapor imagery suggests a vort max is located
   roughly 100mi west of 4mk and ascent ahead of this feature should
   encourage precip to eventually moisten the boundary layer farther
   north.  Forecast soundings suggest freezing rain will linger across
   the southern valley, and near the coast, well into the evening hours
   while sleet will initially be the primary type across the northern
   Willamette Valley near the WA/OR border.  Changeover to freezing
   rain should occur in the Portland vicinity between 01-03z.

   ..Darrow.. 01/07/2017


   LAT...LON   43982338 45712329 45722391 46372387 46262266 45462210
               44932260 44012284 43982338 

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