SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0157 AM CST Thu Jan 21 2021 Valid 231200Z - 241200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected across the U.S. on Saturday. ...Discussion... Slow progression of the upper pattern is expected Saturday, as the main feature of interest -- the upper trough over the West -- continues a slow southeasterly advance. As this occurs, downstream flow across the central and into the eastern U.S. will take on gradual anticyclonic curvature in response. At the surface, high pressure will remain prevalent east of the Rockies, though a cold front crossing the Desert Southwest and southern Rockies is progged to eventually reach the central and southern Plains. Similar to Friday, showers will accompany the advance of the upper system across the West, as cold air/steep lapse rates aloft spread slowly eastward. While a few lightning flashes may again occur over parts of the West, anticipated coverage appears insufficient to warrant inclusion of a 10% thunder area. ..Goss.. 01/21/2021
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