The Sacramento region braces for a powerful storm, with the National Weather Service warning people to expect a deluge of rain, snow, and strong winds over the weekend.
The storm, caused by a strong atmospheric river, is expected to create widespread disruptions, with the NWS issuing a series of warnings and watches over Northern California.
The NWS has issued a Winter Storm Warning for higher elevations until 10 p.m. today, specifically for areas above 3500 feet in the Sierra and southern Cascades, including Interstate 80, and above 3000 feet in the Shasta County mountains.
A Flood Watch has been issued for Valley and foothills communities north of Interstate 80 until early Saturday. The wind will also pose a problem to both visitors and locals, as a Wind Advisory is in effect until this evening for the Northern and Central Sacramento Valleys, as well as the neighboring foothills.
According to radar data, precipitation has already begun, drenching the Coastal Range and overflowing into the northern parts of the Sacramento Valley.
Accumulations have been inconsistent but increasing, and commuting traffic may be affected by water ponding on roads and hazardous travel conditions, according to the NWS. Heavy rain is forecast Friday morning, with less strong precipitation continuing until Saturday.
Forecasters anticipate that the first wave of the storm will bring 7 to 13 inches of precipitation at high elevations, with a 40% to 95% possibility of exceeding 3 inches in some regions.
Snow levels, which range from 3500 to 4500 feet this morning, may fluctuate throughout the week, potentially affecting mobility in the Shasta County mountains and the Sierras. Snowfall is expected to range from 10 to 20 inches at elevations above 4500 feet, with local summits potentially receiving 2 to 4 feet of snow.
Looking ahead to next week, ensemble advice shows that atmospheric conditions will not improve, with more rain and snow on the way. The National Blend of Models predicts 30-60% likelihood of 1 inch or more of precipitation in the Valley through Tuesday.
Mountain residents may receive continuing snowfall, with chances of 12 inches or more ranging between 55% and 85%. Before heading out, travelers should check the NWS website for updates and Caltrans for road conditions.
Due to the impending storm system, there may be spells of MVFR/IFR conditions with LIFR in the highlands; gusty southerly winds are expected, perhaps creating additional disruptions in flight schedules.
Aviation impacts, as well as probable low-level wind shear, may hinder flights at RDD and RBL as the storm progresses.