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Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.

Wednesday, December 22, 2021

SPC Dec 22, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1030 AM CST Wed Dec 22 2021 Valid 221630Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN THE COASTAL PACIFIC NORTHWEST... ...SUMMARY... A brief tornado and/or isolated damaging winds are possible along the Washington coast this afternoon, and along the Oregon to northern California coast this evening into the overnight. ...Pacific Northwest... A positive-tilt upper trough off the coast of southern British Columbia will continue to amplify and dig southeastward as it approaches the Pacific Northwest tonight. A related cold front will spread inland across coastal Washington later this afternoon/early evening and parts of Oregon tonight. Overall buoyancy will remain minimal, but low-topped convection should increase near the front later today. Wind profiles will be conditionally supportive of brief low-topped supercells. This potential may be relatively more probable along the Oregon coast early this evening as 50 kt 850-mb winds coincide with near-50F surface dew points and potentially a couple hundred J/kg SBCAPE. A brief tornado, isolated severe wind gusts, and small hail are all possible in the more robust low-topped convection consisting of showers and sporadic lightning flashes. ..Guyer/Wendt.. 12/22/2021 Read more LIVE: