National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

A trapping inversion aloft will keep the dense fog in place across the area through Friday morning. Some improvement may be seen during the afternoon, but, the dense fog will rapidly re-develop this evening.
Dense fog will persist into Friday before lifting. The clouds, however, will persist into the holiday weekend. A strong front will sweep through the area on Sunday dropping temperatures and bringing a risk of some snow.
Check out Christmas Day weather history for the Quad Cities and Dubuque! While no records this year, temperatures will be above normal area-wide. For more Christmas Day climate data, visit https://www.weather.gov/dvn/Climate_WHR_1225.