Administrators NorthGeorgiaWX Posted December 20, 2023 Administrators Posted December 20, 2023 SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1025 AM CST Wed Dec 20 2023 Valid 201630Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible across parts of southern/central California and over portions of the Southwest. Severe weather is not expected. ...Discussion... Low-amplitude ridging aloft will prevail across much of the country today, as eastern U.S. troughing continues to slowly depart the Northeast. The main feature of interest with respect to convective potential remains an upper low off the coast of California, which will continue moving slowly southward. Within the warm conveyor region of this system, and just ahead of a weak surface front moving onshore, a disorganized band of convection is indicated -- the strongest portion of which will gradually move onshore over San Luis Obispo and Santa Barbara Counties over the next few hours. Ahead of this band, onshore instability remains very weak and low-topped -- as evidenced by the overall lack of lightning. This, combined with weak low-level shear precludes any appreciable risk for severe weather, though gusty winds may accompany any stronger convective elements. Elsewhere, sporadic lightning will continue across portions of the Southwest, in conjunction with a weaker mid-level disturbance moving slowly eastward across the Four Corners states. Thunderstorms are not expected across the remainder of the U.S., where surface high pressure and accompanying cool/stable conditions prevail. ..Goss/Thornton.. 12/20/2023 Read more View the full article Quote
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