Lassen County, CA
Alerts
Alerts are listed in order of start time and level of severity. Click on the alert title to read details for each alert.
In effect from Tuesday 04/21 11:02 AM PDT – Wednesday 04/22 5:00 PM PDT
Issued by NWS Sacramento CA
What
Heavy snow. Additional snow accumulations of up to 6 to 12 inches above 5000 feet, with up to 18 inches at the highest peaks. Minor accumulations of up to 2 inches possible down to 4500 feet. Southwest winds could gust as high as 50 mph.
Where
Northern Sierra Nevada and southern Cascades above 5000 feet, including Highway 50, Interstate 80 and Lassen Volcanic National Park.
When
Until 5 PM PDT Wednesday.
Impacts
Travel could be very difficult. The hazardous conditions could impact the Tuesday and Wednesday commutes.
Additional Details
Snow levels 5500 to 6500 feet today, lowering to 4500 to 5500 feet by early Wednesday. Locally lower snow levels possible in heavier convective showers. Heaviest snowfall expected this afternoon and evening with snowfall rates of 1 to 2 inches per hour at times.
What to do
Check the latest road conditions from Caltrans online at quickmap.dot.ca.gov or dial 5 1 1.
Areas impacted
- Lassen Volcanic National Park
- Sierra Nevada of Tehama-Butte-Plumas Counties Above 3000 ft
- Sierra Nevada of Sierra-Nevada-Placer Counties Above 5000 ft Including Interstate 80
- Sierra Nevada of El Dorado-Amador-Northern Alpine Counties Above 5000 ft Including Highway 50
- Sierra Nevada of Calaveras-Tuolumne-Southern Alpine Counties Above 5000 ft
Tips to stay safe
A Winter Storm Warning means that a dangerous winter storm is expected, making travel difficult or impossible. Take immediate action to prepare your home, vehicle and family.
- Avoid travel if possible. If you must travel, check road conditions and closures before you leave, and make sure you have an emergency kit in your car. Make sure you have a full tank of gas and/or a fully charged battery.
- Stock emergency supplies in your home before the storm hits. Include food, water, essential medications, flashlights and batteries.
- Make sure that pets and other animals have plenty of food and water, and access to a warm shelter.
- If using heat from a fireplace or wood stove, make sure it is properly ventilated. Never use a gas range or oven to heat your home. If using a generator, it should be placed outdoors, at a distance from the home.
- If stuck in your vehicle, stay there and contact the authorities for help. Run the motor about 10 minutes per hour for heat, but open the windows just a little for fresh air.
From the forecaster
Winter Storm Warning
Created by the NWS Sacramento WFO
With periods of moderate to heavy snow possible Tuesday into Wednesday, a Winter Storm Warning is in effect through 5 pm Wednesday, April 22, 2026 for Sierra/southern Cascades locations above 5000 feet.
Winter Weather Advisory
Created by the NWS Reno WFO
A Winter Weather Advisory is in effect for the Greater Lake Tahoe region and Mono County as a spring storm brings heavy snow and strong/gusty winds Tuesday morning through Wednesday.
Seven-day weather risk overview
Daily weather risk summary
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