Mammoth Lakes, CA – Backcountry travel across the Eastern Sierra is becoming increasingly dangerous this weekend as heavy snow and powerful winds drive avalanche risk higher in Mono County, prompting officials to urge recreationists to stay out of avalanche terrain.
According to the Eastern Sierra Avalanche Center, a Backcountry Avalanche Watch remains in effect through Sunday morning, citing widespread unstable snow conditions developing across higher elevations. The National Weather Service office in Reno reports that strong to extreme winds combined with heavy snowfall are rapidly loading slopes, creating conditions favorable for both natural and human-triggered avalanches.
The highest risk is focused along the Sierra crest and wind-loaded terrain near Mammoth Lakes, June Lake, Lee Vining Canyon, and backcountry areas east of Yosemite National Park. Steep slopes, gullies, and areas below cornices are especially hazardous. Officials warn avalanches could be large enough to bury a person and may occur well below ridgelines due to drifting snow.
Emergency managers recommend avoiding non-essential backcountry travel, sticking to low-angle terrain, and postponing trips until conditions stabilize. Those already in mountain areas should monitor weather updates closely and carry proper safety equipment, including avalanche beacons and communication devices.
The avalanche watch is set to expire Sunday morning, but additional advisories or warnings could be issued if snowfall and wind persist. Officials say conditions may remain dangerous beyond the weekend, even after storms begin to ease.
