Avalanche forecast

West Slopes North

Northwest Avalanche Center
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Avalanche danger

Sat
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Out of date — this forecast expired 4 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Look for increasing avalanche danger through the morning as the snow starts to deepen and temperatures creep up. You are more likely to trigger an avalanche in areas where the wind transports snow into thicker, easier to trigger slabs. Heavy rain in the last week uncovered creek holes, rocks, and other features that could injure the unwary.

Avalanche problems

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–2

    Around a foot of new snow - maybe more in favored locations - along with warming temperatures will likely build easy to trigger slabs on all aspects. Strong winds will make slabs thicker and more reactive in wind-loaded areas. Avoid steep slopes where you witness active wind transport.

    Shooting cracks and recent avalanches are obvious signs that conditions are becoming less stable. You can also just keep tabs on new snow layering with hand shears or stomping on short, steep slopes and wind lips. These tests are easy to do on the move and give instant feedback about new snow stability. Adjust your plan based on your observations and move to simpler terrain as signs of instability increase.  

    If traveling at lower elevations, look for signs of wet avalanche activity and even small avalanches as snow switches over to rain. 

    (12/20/2022)

    An example of a denser slab easily sliding on slightly weaker snow below.  Simple tests like shovel tilts, hand shears and just stomping or cutting across short, steep, no-consequence, slopes help gauge the bond of new snow layers.

    Photo: John Minier - Baker Mountain Guides

Avalanche Discussion

Observers in Canyon Creek and the Baker Backcountry found similar conditions both Wednesday and Thursday. A foot of new snow developed a good bond to the rain-affected layer below. Wind slabs and other signs of active or recent wind transport were evident in exposed areas. No signs of instability were reported until Thursday afternoon when increasing winds built small but fragile new slabs. No significant avalanche activity was reported since the rain event last weekend.

The 8-14” of rain from December 23rd through the 27th reshaped the winter landscape at and below the snow surface. The existing snowpack was basically reset as a deep layer of wet grains now topped by the most recent snow. A crust is forming at the wet snow layer but it’s generally unsupportable without floatation.  

Large creek holes and other oddly shaped terrain features opened up. Rocks and other objects melted out and were then barely covered with new snow. Frozen, chunky debris - from the natural avalanche cycle early in the rain event - is found in most run-outs. Use caution in poor visibility and when entering rollovers and other undulating terrain features. 

 

Regions covered