Station Name: TUOLUMNE R A GRAND CYN OF TUOLUMNE AB HETCH HETCHY
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 3,842 feet

Nearest Address:
White Wolf Road
Groveland, CA 95321
Tuolumne County

GPS Coordinates: 37.9165884, -119.6598938

Nearby Water Temperatures

Winter Storm Warning issued April 20 at 2:11PM PDT until April 22 at 5:00PM PDT by NWS Sacramento CA

Effective: Mon April 20, 2026, 2:11 PM
Expires: Tue April 21, 2026, 5:15 PM

* 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 (El Dorado-Amador) Above 5000 ft, Lassen Volcanic NP, Sierra (Cal-Tuo) Above 5000 ft, Sierra (Sierra-Placer) Above 5000 ft, and Sierra (Tehama-Plumas) Above 3000 ft Counties. * 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.

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

Winter Storm Warning issued April 21 at 11:02AM PDT until April 22 at 5:00PM PDT by NWS Sacramento CA

Effective: Tue April 21, 2026, 11:02 AM
Expires: Wed April 22, 2026, 5:00 PM

* 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.

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

Winter Storm Warning issued April 21 at 10:45AM PDT until April 22 at 5:00PM PDT by NWS Hanford CA

Effective: Tue April 21, 2026, 10:45 AM
Expires: Tue April 21, 2026, 7:00 PM

* WHAT...Heavy snow expected. 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. Wind gusts as high as 75 mph along the Sierra crest expected. * WHERE...Kaiser to Rodgers Ridge, Kings Canyon NP, Sequoia NP, Upper San Joaquin River, and Yosemite NP outside of the valley. * WHEN...Until 5 PM PDT Wednesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday evening and Wednesday morning commutes. Strong winds could cause tree damage.

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.

Flood Advisory issued April 21 at 1:28PM PDT until April 21 at 7:30PM PDT by NWS Sacramento CA

Effective: Tue April 21, 2026, 1:28 PM
Expires: Tue April 21, 2026, 7:30 PM

* WHAT...Urban and small stream flooding caused by thunderstorms. * WHERE...Portions of central and northern California, including the following counties, Placer, Amador, Calaveras, El Dorado, Nevada, Sacramento, San Joaquin, Stanislaus, Sutter, Tuolumne and Yolo. * WHEN...Until 730 PM PDT Tuesday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Water over roadways. * ADDITIONAL DETAILS... - At 124 PM PDT, Doppler radar and rain gauges indicated heavy rain due to thunderstorms. Local emergency managers reported flooding. Minor flooding is ongoing or expected to begin shortly in the advisory area. Potential for isolated mud or rock slides in the foothills as the line of storms moves eastward. Between 0.5 and 1 inch of rain has fallen in the last 6 hours. - Some locations that will experience flooding include... Sacramento, Stockton, Modesto, Elk Grove, Roseville, Citrus Heights, Tracy, Folsom, Rocklin, Galt, Oakdale, Auburn, Placerville, Sonora, Jackson, Paloma, El Dorado Hills, Fair Oaks, Cameron Park and Carmichael. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

Special Weather Statement issued April 21 at 5:12PM PDT by NWS Hanford CA

Effective: Tue April 21, 2026, 5:12 PM
Expires: Tue April 21, 2026, 5:45 PM

At 512 PM PDT, Doppler radar was tracking a strong thunderstorm 7 miles southeast of Yosemite Lakes, or 19 miles north of Clovis, moving northeast at 25 mph. HAZARD...Wind gusts up to 40 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Yosemite Lakes, Peckinpah, Bass Lake, Crane Valley Reservoir, North Fork, Millerton Lake, Auberry, Friant, and Shaver Lake.

If outdoors, consider seeking shelter inside a building.