Station Name: MERCED R A HAPPY ISLES BRIDGE NR YOSEMITE CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 4,095 feet

Nearest Address:
Happy Isle Loop Rd
Yosemite Valley, CA 95389
Mariposa County

GPS Coordinates: 37.73131496, -119.5590514

Nearby Water Temperatures

Winter Storm Warning issued April 11 at 11:34AM PDT until April 12 at 11:00PM PDT by NWS Hanford CA

Effective: Sat April 11, 2026, 11:34 AM
Expires: Sat April 11, 2026, 10:00 PM

* WHAT...Heavy snow expected. Low-end storm total of 10 inches and high-end total of 30 inches expected in Madera and Mariposa Counties and Yosemite National Park above 7,000 ft. Winds gusting to 55 mph or higher. * WHERE...A portion of central California. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. Whiteout conditions are expected and will make travel treacherous and potentially life-threatening.

Persons should delay all travel if possible. If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility. Leave plenty of room between you and the motorist ahead of you, and allow extra time to reach your destination. Avoid sudden braking or acceleration, and be especially cautious on hills or when making turns. Make sure your car is winterized and in good working order.

Winter Storm Warning issued April 11 at 9:36PM PDT until April 12 at 11:00PM PDT by NWS Hanford CA

Effective: Sat April 11, 2026, 9:36 PM
Expires: Sun April 12, 2026, 6:00 AM

* WHAT...Heavy snow expected. Low-end storm total of 10 inches and high-end total of 30 inches expected in Madera and Mariposa Counties and Yosemite National Park above 7,000 ft. Winds gusting to 55 mph or higher. * WHERE...A portion of central California. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. Whiteout conditions are expected and will make travel treacherous and potentially life-threatening.

Persons should delay all travel if possible. If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility. Leave plenty of room between you and the motorist ahead of you, and allow extra time to reach your destination. Avoid sudden braking or acceleration, and be especially cautious on hills or when making turns. Make sure your car is winterized and in good working order.

Winter Storm Warning issued April 11 at 9:14AM PDT until April 12 at 11:00PM PDT by NWS Sacramento CA

Effective: Sat April 11, 2026, 9:14 AM
Expires: Sun April 12, 2026, 1:00 PM

* WHAT...Heavy snow expected. Total snow accumulations 1 to 2 feet above 4500 feet, with up to 3 to 4 feet at the highest peaks. Minor snowfall accumulations of 2 to 4 inches down to 4000 feet. Wind gusts as high as 50 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park Counties. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact weekend mountain travel. * ADDITIONAL DETAILS...Snow levels lower to 6000-7000 feet today, then to around 4000-5000 ft Sunday. Heavy snowfall rates of 1-2 inch per hour, with the heaviest snowfall this afternoon through Sunday.

Check the latest road conditions from Caltrans online at quickmap.dot.ca.gov or dial 5 1 1.

Winter Storm Warning issued April 11 at 12:15PM PDT until April 12 at 11:00PM PDT by NWS Reno NV

Effective: Sat April 11, 2026, 12:15 PM
Expires: Sun April 12, 2026, 5:00 PM

* WHAT...Heavy snow. Snow accumulations between 2 to 8 inches below 8000 feet, 6 to 12 inches above 8000 feet, and locally up to 24 inches across higher terrain along the Sierra crest. Winds peak along the crest gusting as high as 80 mph and up to 45 to 55 mph along Highway 395. * WHERE...Mono County. * WHEN...From 2 PM this afternoon to 11 PM PDT Sunday. * IMPACTS...Travel could be very difficult to impossible. Strong winds could cause damage to trees and power lines.

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.