Bulletin d’avalanche

Mount Shasta

Mount Shasta Avalanche Center
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Danger d’avalanche

Sun
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Southerly wind and a few inches of recent, low density snow will allow for blowing snow to occur today. You are most likely to trigger avalanches where wind has recently formed drifts or slabs. Avalanche size will be small and shallow, but be aware of what is below you, like terrain traps or steep slopes. A smooth, slick surface can increase the consequences of getting knocked off balance by a small slide in steep terrain. Look for pockets of wind-drifted snow near and above treeline, especially on the down-wind side of ridges and bowls.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    A few inches of new snow fell over the past 24 hours, and blowing snow has been observed near and above treeline. Wind has been blowing primarily out of the SW-S-SE, averaging  10-15 mi/hr with gusts to 40+ mi/hr. The wind slab avalanche problem is most prevalent at mid and upper elevations, where slabs could be larger and more widespread. All told, we don't expect large avalanches to occur today, but it is wise to monitor the depth of wind deposited snow and remember that as wind slabs become deeper, resulting avalanches can increase in size and consequence.When visibility is poor near and above treeline, tools such as a slope angle shaded map can help you understand which slopes are steep enough to produce avalanches. Avalanche terrain begins on slopes over 30 degrees and most specifically on slopes 37–38 degrees. Wind slabs form in specific terrain and will not be found everywhere. Recognize leeward slopes and where wind blown snow is accumulating.  Wind slabs typically form below ridge tops, bowls, high points and around features that catch blowing snow from cross-slope winds. Shooting cracks in wind drifted snow and/or signs of previous avalanches are good indicators that triggering a wind slab avalanche is possible.

Avalanche Discussion

  • TONIGHT!! Mount Shasta City -  Avalanche Awareness @ Deadwood Supply Co. - 7pm
  • Sunday, Sunday, Sunday - Companion Rescue @ Bunny Flat trailhead on the south side of Mount Shasta - 9am

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