Lawinenlagebericht

Mount Shasta

Mount Shasta Avalanche Center
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Lawinengefahr

Sat
Hochgebirge
2 · Mässig
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist last year abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Heightened avalanche conditions continue above treeline, with avalanche activity unlikely below and near treeline. Westerly wind continues to transport soft snow onto NW-N-NE-E-SE-S aspects, increasing the likelihood of freshly formed wind slab avalanches. Pay close attention to snow surfaces and weather trends, watching for active wind loading, unusually deep and dense snow, and shooting cracks across slopes. Large wind slabs could exist on the uppermost portions of Mount Shasta.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2

    Wind slab avalanches are possible near and above treeline on N-NE-E-SE aspects, with cross loaded slopes possible on NW and S aspects. Light (1-16 MPH) to moderate (17-25 MPH) westerly wind will continue today, with no shortage of soft snow available for transport. This evening, wind speeds may pick up to strong-extreme up high on Mount Shasta, speeding up the loading process of these leeward slopes. Expect sensitive new cornices, wind drifts, and small slabs on easterly aspects. To avoid this issue, pay attention to snow surface, weather trends, and use small test slopes before entering consequential or steep terrain (greater than 30 degrees). Specific areas to be cautious of are east facing Casaval Ridge, Trinity Chutes, upper Red Banks, and upper Old Ski Bowl. 

    Photo: Nick Meyers

Avalanche Discussion

A large, persistent slab avalanche naturally released earlier this week on the northwest face of Gray Butte. Failure occurred on a weak layer of graupel that was buried on March 11. Beside the one slide, the rest of northerly Gray Butte is untouched. Forecasters returned to the area yesterday for further investigation, read the observation HERE. This layer continues to be weak, and reactive, but buried deep enough making it difficult to trigger. These weak grains have created a low likelihood, high consequence situation. Approach this area with caution, as triggering an avalanche would be large and destructive. Ideally, avoid the steep slopes of Gray Butte altogether for a few more days, letting these grains heal.

The Everitt Memorial Highway and Castle Lake roads are closed. Unknown re-opening. Road status page - click here

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