SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1248 AM CST Thu Jan 21 2021 Valid 221200Z - 231200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No severe weather is expected across the U.S. Friday. ...Discussion... While fast westerly/west-northwesterly flow aloft will prevail over the eastern half of the country Friday, amplification of the upper flow field is progged over the West. This will occur as an upper low, initially near the northern California/southern Oregon Coasts, digs southeastward across California and the Great Basin. By the end of the period, large-scale cyclonic flow will encompass essentially the entire western CONUS. At the surface, high pressure will prevail east of the Rockies, as a west-to-east baroclinic zone sags southward into the northern Gulf of Mexico. Meanwhile, a cold front is forecast to advance across California and the Great Basin, and the Desert Southwest through the period. As the upper trough -- and associated pocket of cold air/steep lapse rates aloft spreads across the West, scattered showers are expected. While a few/sporadic lightning flashes cannot be ruled out, at this time it appears that coverage will remain low -- thus not warranting 10% thunder area introduction at this time. ..Goss.. 01/21/2021
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