SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0107 AM CST Wed Jan 20 2021 Valid 221200Z - 231200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No severe weather is expected across the U.S. Friday. ...Discussion... Substantial amplification of the large-scale pattern is expected Friday, as the short-wave trough digging southeastward across the northwestern U.S. at the start of the period strengthens with time. By the end of the period, broad/high-amplitude cyclonic flow will prevail over the entire western U.S., with the positively tilted trough axis extending from Montana to central California. At the surface, high pressure will prevail east of the Rockies through the period, while a cold front shifts across the Southwest/southern Rockies through the period. With dry/stable conditions prevailing east of the Rockies, thunderstorms are not expected. In the West, cold air/steep lapse rates aloft -- associated with the upper trough -- will support scattered/showery convection. While a lightning flash or two cannot be ruled out, any coverage would likely be less than 10%. ..Goss.. 01/20/2021
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