Severe Winter Storm Forecast: Sierra Nevada to Expect Blizzard Conditions and Heavy Snow

A severe winter storm has struck the Sierra Nevada in Northern California, triggering extreme weather conditions and causing significant concerns for residents and travelers in the region. The storm is expected to bring copious amounts of snow through the weekend, presenting numerous challenges and hazards.

Blizzard Warnings and Impassable Roadways

The National Weather Service has issued Blizzard Warnings for the Sierra and Foothills from Thursday morning to Sunday morning, indicating the potential for long stretches of roadway to become impassible due to blizzard conditions. The heaviest snowfall is expected Thursday night to Friday afternoon and again Friday night, with snowfall rates approaching 2-4 inches per hour. Moreover, strong winds with gusts ranging from 60-80 mph, and potentially over 100 mph at mountain ridgetops, are anticipated. These conditions will result in white-out scenarios, making mountain travel extremely perilous.

Storm Summary

• Blizzard Conditions: Zero visibility, strong winds, and extremely heavy snow
• Snowfall Rates: 2-4 inches per hour
• Wind Gusts: 60-80 mph, possibly exceeding 100 mph over mountain ridgetops
• Snowfall Totals: Projected between 5-12 feet for elevations above 5,000 ft

Impact and Travel Restrictions

Mountain travel is expected to shift from dangerous to nearly impossible, especially on Friday. Snow levels are predicted to start between 4,000-5,000 ft and then lower to 2,500-3,500 ft by Friday. The most severe part of the storm is forecasted to hit the Sierra on Friday. Expect road conditions to rapidly deteriorate and hard closures across mountain passes. Strong winds and heavy snow may lead to tree damage and extensive power outages, especially at elevations above 3,000 ft. The Valley will experience lighter impacts, including light to moderate rain with a low chance of thunderstorms, large puddles, and ponding of water on roadways.

Weekend Forecast

By Saturday, the most intense part of the storm for the Sierra will have passed, but temperatures will continue to fall, resulting in lowering snow levels down to 2,000 ft. The storm is expected to start moving out on Sunday morning, leading to a sharp improvement in overall weather conditions Sunday afternoon. The Sierra is projected to receive significant snowfall, with storm total snowfall estimated between 5-12 feet for elevations above 5,000 ft, and 1-4 feet for elevations above 3,000 ft. Minor accumulation is possible down to 2,000 ft over the weekend.

Post-Storm Conditions and Travel Advisory

Travel across the Sierra is anticipated to remain challenging well after the storm ends as crews work to clear the roads. Chain controls are expected through the weekend as CalTrans conducts cleanup operations. Residents and travelers are advised to stay updated with the CBS Sacramento First Alert Weather team for the latest developments and advisories throughout this 4-day storm.