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000 ACUS01 KWNS 111253 SWODY1 SPC AC 111252 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0652 AM CST Tue Dec 11 2018 Valid 111300Z - 121200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected across the contiguous U.S. today through tonight. ...Western WA/northwest OR... A shortwave trough off the coast of British Columbia early today will steadily amplify and spread southeastward toward the coastal Pacific northwest, reaching the WA/OR coast by 00Z and advancing inland across the Pacific Northwest through late tonight. Steepening lapse rates will occur by evening as sub -30 C temperatures aloft spread inland. Forecast soundings suggest buoyancy will become deep enough for some lightning within the post-frontal regime across coastal areas of WA and northwest OR this evening, and possibly inland toward the WA and northern OR Cascades. ..Guyer/Goss.. 12/11/2018 $$