High Wind in Napa County, California

A 71 mph westerly wind gust was reported by the Whitewater mesonet station. Strong wind gusts to 55 mph buffeted other eastern portions of the San Gorgonio Pass.

An upper level trough and the tail end of a Pacific cold front traversed the region on the 15th and 16th of December. Though showers were reported across the region, the main impact was wind, with gusts exceeding 70 mph along the desert slopes. Winds associated with a mountain wave also briefly surface in the Coachella Valley, producing minor damage in southern La Quinta. Rain and patchy dense fog along the coastal slopes impacted driving conditions. San Diego County reported 546 traffic accidents (390% of normal), one traffic accident resulted in a fatality along Interstate 8.