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000 ACUS01 KWNS 121556 SWODY1 SPC AC 121554 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0954 AM CST Thu Dec 12 2019 Valid 121630Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG PORTIONS OF THE WASHINGTON AND OREGON COAST.... ...SUMMARY... A marginal risk for brief tornadoes will persist through the early afternoon along parts of the Washington and Oregon coast. ...WA/OR... IR satellite imagery shows a compact and fast-moving shortwave trough about 150nm west of Portland, Oregon. This feature and an associated cold front will approach the coast of WA/OR in the next few hours. A pocket of persistent lightning activity is noted ahead of this feature, and radar suggests that scattered showers and thunderstorms will begin moving ashore soon. Instability parameters are quite weak with CAPE values below 200 J/kg. Nevertheless, orographically enhanced low-level shear profiles may be sufficient for a brief spinup as convection moves onshore. This threat is expected to decrease by late afternoon as the cold front passes and low-level winds veer. ..Hart/Kerr.. 12/12/2019 $$