Tuolumne 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 2:00 AM PDT – Wednesday 04/22 5:00 PM PDT
Issued by NWS Sacramento CA
What
Heavy snow likely above 5000 feet. Total snow accumulations of up to 12 to 18 inches, with up to 2 feet 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
Sierra Nevada and southern Cascades above 5000 feet, including Highway 50, Interstate 80 and Lassen National Park.
When
From 2 AM Tuesday to 5 PM PDT Wednesday.
Impacts
Travel could be very difficult. The hazardous conditions could impact the Tuesday and Wednesday commutes.
Additional Details
Snow levels initially 6000 to 7000 feet tonight, lowering to 5500 to 6500 feet Tuesday, and down to 4500 to 5500 feet Wednesday. Heaviest snowfall expected Tuesday afternoon and evening with snowfall rates of 1 to 2 inches per hour.
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.
In effect from Tuesday 04/21 2:00 AM PDT – Wednesday 04/22 5:00 PM PDT
Issued by NWS Hanford CA
What
Heavy snow possible. Total snow accumulations 3 to 5 inches above 7,000 feet, with 12 to 18 inches possible at the highest elevations of the Sierra Nevada. Winds could gust as high as 75 mph along the Sierra crest.
Where
Kaiser to Rodgers Ridge, Kings Canyon NP, Sequoia NP, Upper San Joaquin River, and Yosemite NP outside of the valley.
When
From 2 AM Tuesday to 5 PM PDT Wednesday.
Impacts
Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday morning and evening commutes. Strong winds could cause tree damage.
What to do
If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
Areas impacted
- Yosemite NP outside of the valley
- Upper San Joaquin River
- Kaiser to Rodgers Ridge
- Kings Canyon NP
- Sequoia NP
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
Changing Weather Pattern Starting Tonight
Created by the NWS Hanford WFO
(Update @ 8:45 AM): Dry and warm conditions will transition to unsettled conditions tonight. Periods of heavy rain and lightning are expected alongside Sierra Nevada snow through Wednesday. A Winter Storm Warning for the Sierra Nevada mountains is in effect through 5PM Wednesday.
Winter Storm Watch
Created by the NWS Sacramento WFO
With periods of moderate to heavy snow possible Tuesday into Wednesday, a Winter Storm Watch is in effect from 2 am Tuesday, April 21 through 5 pm Wednesday, April 22, 2026 for Sierra/southern Cascades locations above 5000 feet.
Seven-day weather risk overview
Daily weather risk summary
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