Dangerous May Storm Slams Donner Pass: Heavy Snow and Wind Alerts
The Sierra Nevada is bracing for a rare and potent late-season winter storm that is expected to bring treacherous conditions to Interstate 80 at Donner Pass through early next week. While California residents are typically preparing for summer, the National Weather Service (NWS) has issued a Winter Storm Warning, signaling a significant threat to mountain travel.
Extreme Snowfall and Wind
A Pacific low-pressure system is driving moisture levels nearly 90% above the norm for this time of year. Meteorologists project that the highest peaks could see up to 4 feet of snow. At Donner Pass, snow levels are expected to plummet from 7,000 feet to as low as 4,500 feet by Monday night.
Beyond the snow, wind gusts along the Sierra crest are forecasted to reach 70 MPH. This combination will likely lead to:
- Whiteout conditions and severely reduced visibility.
- Rapid snow accumulation on the roadway.
- Icy surfaces as temperatures drop well below freezing.
Impact on Travel and Safety
Caltrans District 3 has warned motorists that travel over I-80 may become impossible during the peak of the storm. Chain controls are anticipated to be strictly enforced, and rolling closures are highly probable to allow for snow removal and safety checks.
Important Note: If you must travel, carry an emergency kit including extra food, water, warm clothing, and a flashlight. Ensure your vehicle is winter-ready and check for the latest updates via Caltrans QuickMap or by calling 1-800-427-7623.
Looking Ahead
The heaviest snowfall is expected between Sunday night and Tuesday morning. While the storm provides a boost to the Sierra snowpack, the timing poses a major risk for unprepared travelers. Officials urge the public to delay travel across the pass until the system clears mid-week to avoid getting stranded in high-altitude freezing conditions.
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