SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1231 AM CST Wed Jan 20 2021 Valid 211200Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe weather is not expected across the U.S. on Thursday. ...Discussion... While fast westerly/west-northwesterly flow will prevail across most of the U.S. this period, three features of note embedded therein will affect portions of the country. The first will be a clipper-type system moving across the Great Lakes/Ohio Valley region, and later the Northeast. The second will be a trough -- initially just off the coast of western Canada -- that will dig south-southeastward with time into the Pacific Northwest. Finally, a weakening upper low/short-wave trough is progged to move quickly across the southwestern quarter of the country. At the surface, a southern Canada low and trailing front -- i.e. the aforementioned clipper-type system -- will move across the Great Lakes/Ohio Valley/Northeast, and this will be the primary surface synoptic-scale feature affecting the U.S. Thursday. While much of the country will remain dry/stable, showers will move across the southwestern quarter of the country in conjunction with the fast-moving -- though weakening -- upper system. Embedded within the shower activity, a few lightning flashes will likely occur -- particularly during the first half of the period from southern Arizona to Far West Texas. Elsewhere, thunderstorms are not expected. ..Goss.. 01/20/2021
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