Avalanche forecast

West Slopes South

Northwest Avalanche Center
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Avalanche danger

Sat
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
2 · Moderate
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Out of date — this forecast expired 6 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Avalanche danger will increase throughout the day on Friday, particularly in the Paradise area, creating the potential to trigger a large avalanche where 8" or more of storm snow sits atop a firm crust.  Check for signs of unstable snow using visual clues such as cracking and safe test slopes. Navigate around wind-loaded or unsupported slopes steeper than 35 degrees. At Crystal and White Pass where we expect less snowfall, avalanche danger may be limited to areas where winds have drifted 6" or more of snow.

Avalanche problems

  • Storm Slabs

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

    We're expecting 6-10" of low-density snow by the end of the day Friday at Paradise, with 3-5" at White Pass, and 2-3" at Crystal. Your avalanche problem will depend upon how much snow falls in your area. Anywhere 8" of snow accumulates above the recent firm crust, expect the potential to trigger small or large avalanches on slopes steeper than 35 degrees, particularly those that are wind-loaded or unsupported. Avalanches may run farther than you expect given the aid of a firm bed surface. A quick slope test or shovel shear test can help confirm the problem in your terrain. If you find evidence of the problem, dial back your terrain selection. At Crystal or White Pass, you may find shallow new snow above the crust and negligible avalanche danger as you ascend, but at upper elevations, wind slabs will develop. Look for evidence of active wind transport (blowing snow) or recent wind transport such as fresh cornices to help you identify and avoid steep slopes where 6" or more of snow has accumulated.

    Example: Slab avalanche triggered on a steep, convex slope.

Avalanche Discussion

A few inches of snow fell at upper elevations as cooler air came in Tuesday night through Thursday. This allowed the upper snowpack to refreeze and form a supportable crust following a rain event on Tuesday and Wednesday. This firm crust is expected to limit avalanche activity to the snow above the crust.

Thursday night and Friday will bring in light to moderate snow and wind. In areas where less snow falls, ice may be the greatest hazard you face. Consider your ability to self-arrest and the consequences of a fall given the terrain below you.

Many previously buried obstacles reemerged following the early December high pressure and rain event. You’ll need to navigate around numerous open creeks, downed logs, and areas of thin coverage. Give yourself extra time to manage these demanding travel conditions.

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

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