The slide quickly became the deadliest in state history and the deadliest in U.S. history in nearly five decades. It happened in an area of the northern Sierra Nevada mountain range that experts say is "one of the snowiest places in the western hemisphere."
Backcountry skiers usually carry items like beacons, probes, shovels or satellite phones, which can be used to precisely locate someone buried under snow and get them out.
Before navigating treacherous terrain like the backcountry of California's Sierra Nevada during a peak winter storm, experts suggest looking for a bevy of potential warning signs to avoid getting caught in an avalanche.
Has there been significant snowfall or rain in the area?
Significant snowfall or rain is one of the most common red flags for avalanche activity because it adds immediate weight and stress to the snowpack. A general rule of thumb used by experts is that one foot or more of new snow in a 24-hour period makes avalanche conditions likely to be dangerous.
Persistent slabs are one of nine types of avalanches, which include storm slab, deep persistent slab, wet slab, wet loose, dry loose, cornice fall and glide avalanche.
Wind-blown snow
Rapidly melting snow
A rapid rise in temperature is a major warning sign that the snowpack is losing its strength. Strong sun, a sudden thaw, or even rain can cause the snow to creep downhill or become saturated with water, leading to wet avalanches. If you see "pinwheels," or small snowballs rolling down the slope, or if you are sinking into the snow past your ankles in slushy conditions, it is a clear sign that the snow is melting too quickly to remain stable.
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