Lawinenlagebericht

Mount Shasta

Mount Shasta Avalanche Center
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Lawinengefahr

Fri
Hochgebirge
4 · Gross
Waldgrenze
4 · Gross
Unterhalb
3 · Erheblich
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Veraltet — dieser Lagebericht ist 2 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Snowfall accumulation of one to two feet and strong southwesterly wind will rapidly spike the avalanche danger. Backcountry travellers should make conservative decisions and navigate with caution below treeline. Traveling near and above treeline is not recommended. No matter where you go, avoid being on, under or near slopes greater than 30°.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2.5

    Near and above treeline, southwest wind will blow 40 to 60 mph with gusts reaching 80 mph today. This, paired with intense snowfall, will lead to wind slabs developing right before our eyes. You are most likely to trigger an avalanche on southeast through north through west aspects, though you may find isolated areas of wind-drifted snow in southwest aspects that are protected from the wind, especially near rock outcroppings and along the sides of gullies.

    Identify areas where the wind has left its mark by pillows, drifts, and wavy snow surfaces. If you observe cracks shooting out from your sled or planks, you've found yourself a wind slab. 

    (2/14/2024)

    Ten foot shooting crack on a wind loaded slope

    Photo: Cory Beattie

  • Storm Slabs

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

    Rapid snow accumulations and low snow levels will allow for storm slab development below treeline. The lower elevation band provides enough shelter from the wind to make this problem more widespread than the wind slab problem. You could trigger an avalanche on any aspect steeper than 30° today. Actively monitor slope angles throughout your travels and watch for signs of instability.

Avalanche Discussion

Happy Leap Year! Though, with March getting ready to come in like a lion, we don't recommend leaping into avalanche terrain today. Prior to the onset of the storm, Mount Shasta held a stable snowpack and a myriad of breakable and supportable crusts. Luckily, this means we don't have any persistent weak layers to be concerned about. Instead, we can focus our attention towards the new/old snow interface over the course of this multi-day loading event. 

The Everitt Memorial Highway and Castle Lake road remain closed for snow removal. Alternative access points include McBride Springs, the Nordic Center, Mount Shasta Ski Park, and Pilgrim and Deer Mountain OSV parks. You can ride a sled from FSR 31 (Old McCloud) up to Old Ski Bowl. Here's a map of the riding boundaries for the Southside of Mount Shasta.

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