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 >

Showers continue moving from south to north this morning. Snow levels are expected to lower to 3500 feet by tonight. Gusty winds will build across the area, with the strongest winds in the Shasta Valley and along the coast south of Cape Blanco. Winds east this evening and tonight. A final wave of showers is expected Friday morning as the low weakens and moves inland. Showers decrease through Saturday morning, with stable conditions forecast into next week.
Snow will continue tonight into Friday. Some will be heavy in the mountains of Siskiyou County and the Mt. Shasta region, especially above 4000 feet. Accumulating snow could impact I-5 down to around Mt Shasta City overnight into Friday morning and, if heavy enough, some snow could also occur down to around Dunsmuir. Be prepared for snow covered roads and hazardous winter driving conditions. Snow will be lighter across the remainder of the area, with winter weather advisories in effect for the Cascades and Siskiyous in Oregon and also for portions of the East Side, especially above 4500 feet. It should be noted that wet, slushy roads in some areas could freeze overnight into Friday morning, so if you have travel plans through Friday, be sure to check road conditions before venturing out.
Periods of higher mountain snow are expected tonight through Sunday night, especially in the Diamond Lake and Crater Lake areas. Be prepared for winter driving with slippery and snow covered roads possible. Be sure to check the forecast and road conditions before you travel and winterize your vehicle. Go to tripcheck.com or quickmap.dot.ca.gov to check road conditions. Practice safe winter driving - take it slow, plan for extra time to reach your destination and leave extra space between you and vehicles in front of you.

 

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