Severe Storm Outlook Narrative (AC)
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ACUS03 KWNS 230807
SPC AC 230807

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0207 AM CST Tue Jan 23 2018

Valid 251200Z - 261200Z


A few thunderstorms will be possible Thursday across coastal
Washington into western Oregon and parts of northern California.

The Day 2 Pacific trough will remain progressive on Thursday and
Thursday night, advancing farther inland across the western U.S.
into the Rockies, while a lead shortwave trough reaches the northern
Plains.  Two upstream shortwave troughs moving through the western
portion of the Pacific trough should aid in upward vertical motion
to support showers across western OR and northern CA Thursday
afternoon, and then across western OR/WA Thursday night.  Forecast
soundings suggest cold 500-mb temperatures (less than -30 C) and
steep lapse rates will allow buoyancy to become deep enough for
charge separation, with a few thunderstorms possible as the
shortwave troughs pass through these areas.

..Peters.. 01/23/2018

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