Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 181200
SWOMCD
SPC MCD 181200
WAZ000-ORZ000-181500-

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

...Please see www.spc.noaa.gov for graphic product...

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

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




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