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California Thanksgiving: 'Micro Blizzards' Could Hit Truckee, CA
Truckee, CA – Imagine driving east on Interstate 80 toward Lake Tahoe for Thanksgiving when a sudden wall of snow sweeps across Donner Pass. Within moments, the highway nearly disappears, brake lights
By Miles Carter · 2026-11-14T11:16:49.159Z
Truckee, CA – Imagine driving east on Interstate 80 toward Lake Tahoe for Thanksgiving when a sudden wall of snow sweeps across Donner Pass. Within moments, the highway nearly disappears, brake lights fade behind blowing snow and drivers struggle to see vehicles just ahead.
It's a winter travel hazard California motorists should understand before Thanksgiving on Thursday, Nov. 26, particularly when crossing the Sierra Nevada.
According to the National Weather Service NWS , snow squalls are brief, intense bursts of snowfall that can produce strong winds, near zero visibility and rapidly deteriorating road conditions. Sometimes informally called "micro blizzards," these events can create dangerous driving conditions with little warning.
California Highways Where Sudden Whiteouts Are a Concern Interstate 80 through Truckee and Donner Summit is a major holiday travel route where heavy snow and strong winds can quickly disrupt mountain driving.
U.S. Highway 50 near Echo Summit and South Lake Tahoe, Interstate 5 near Mount Shasta, and U.S. Highway 395 along the eastern Sierra are additional corridors where sudden winter weather can reduce visibility.
Drivers traveling through Nevada, Placer, El Dorado, Siskiyou and Mono counties should pay close attention to mountain forecasts.
High elevations, exposed passes and rapidly changing conditions can make these routes especially challenging.
Not every intense mountain snow band qualifies as a snow squall, but heavy snowfall and blowing snow can create similar whiteout dangers.
What Happens When a Snow Squall Warning Is Issued? The NWS issues Snow Squall Warnings when dangerous snow squalls are occurring or imminent.
These warnings generally last 30 to 60 minutes and may trigger Wireless Emergency Alerts on compatible mobile phones.
Rapid visibility loss can increase the risk of multivehicle crashes, particularly when drivers brake abruptly or follow too closely.
What Thanksgiving Travelers Should Do If a Snow Squall Warning affects a planned route, delay travel until conditions improve .
Drivers already traveling should gradually reduce speed, increase following distance, use low beam headlights and avoid sudden braking.
If visibility becomes dangerously poor, safely exit the highway when possible rather than stopping in an active travel lane.
Motorists crossing the Sierra should carry required tire chains or traction equipment, check chain control requirements and allow extra travel time.
Before departing, check Caltrans QuickMap for road closures, chain controls and traffic conditions. Official forecasts and warnings are available from NWS Sacramento , NWS Reno and NWS Medford .
This is a Thanksgiving travel preparedness reminder, not a prediction that snow squalls will strike California during the holiday. Understanding how quickly mountain visibility can disappear may help families make safer decisions before crossing the Sierra Nevada.