Above: Radar at 3:05pm 12-11-21 showing winter weather arriving in the region
The first major storm with significant winter impacts for large portions of southern Oregon and northern California are expected this weekend into early next week. This will be a longer duration, multi day event. Major winter weather impacts are expected in the Cascades, Siskiyous, and the Mount Shasta area, with widespread wind, rain, and snow impacts elsewhere. Low elevation snow is expected as well, with light accumulations possible on some of the valley floors.
The storm has already caused winter driving conditions on Highway 97, 140, 58, and others. Just after 1pm today the NWS Medford issued an updated winter weather advisory for our local area.
Winter Weather Advisory issued December 11 at 1:16PM PST until December 13 at 10:00PM PST by NWS Medford
…HEAVY SNOWFALL EXPECTED THROUGH MONDAY NIGHT…
A series of wet and cold low pressure systems will move across Northern California and Southern Oregon today through Tuesday, likely resulting in heavy snowfall across much of Northern California in Siskiyou County, the Siskiyou Mountains, and the Oregon Cascades. There is high confidence that feet of snow will fall at elevations above 3500 feet across those areas, and even at lower elevations in the Mount Shasta City area. Significant travel problems are likely to result throughout the weekend and into early next week.
…WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 10 PM PST MONDAY…
* WHAT… Snow with total snow accumulations of 4 to 6 inches through Sunday morning. Another round of snow accumulations of 6 to 10 inches is expected Sunday night into Monday. Winds gusting as high as 50 mph.
* WHERE… In California, Northeast Siskiyou and Northwest Modoc Counties and Modoc County. In Oregon, Klamath Basin and Central and Eastern Lake County. This includes highways 97, 395, 140 and 139 in addition to the cities of Klamath Falls and Lakeview.
* WHEN… Until 10 PM PST Monday. There will be a relative lull in activity during the day Sunday, but snow will continue into Monday evening. The strongest winds are expected this afternoon and evening and again early Monday morning.
* IMPACTS… Travel could be difficult. Patchy blowing snow could significantly reduce visibility. Gusty winds could bring down tree branches.
* ADDITIONAL DETAILS… The bulk of the snow will fall tonight into Sunday morning and again Sunday night into Monday.