Bulletin d’avalanche

Stevens Pass

Northwest Avalanche Center
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Danger d’avalanche

Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Périmé — ce bulletin a expiré 3 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Clearing skies will bring a chance for triggering wet avalanches on sun-exposed slopes. Watch for signs of instability like rollerballs and natural wet avalanches. You may still be able to trigger avalanches in lingering wind-drifted snow at upper elevations.

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Watch for wet avalanches as the skies clear. These avalanches could be consequential where you find 6 inches or more of soft surface snow that is becoming moist. There may not be enough snow at low elevations for any true hazard. Watch for rollerballs or fresh, wet avalanches as indicators that you could trigger more. You can limit your exposure by moving to more shaded aspects and lower-angled slopes. You may find a thin layer of new snow that has yet to become moist sitting on older, saturated wet grains.

    (4/9/2023)

    Small, natural wet loose slide near Fleur de Lis on Sunday.

    Photo: SPMR Snow Safety

  • Wind Slabs

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

    Expect a range of recent shallow slabs and older slabs from the weekend that may now be more difficult to trigger. The most likely locations to trigger a wind slab will be in alpine terrain just below ridges. If you see large pillow-like drifts, shooting cracks, or the snow feels hollow beneath you, stick to lower-angle slopes or steer around these wind-loaded features.

    (1/19/2023)

    An example of a snowboard triggered windslab from earlier this season. Lichtenberg  Mtn, Stevens Pass

    Photo: NWAC Public Obs

Avalanche Discussion

Between last Thursday and Tuesday, nearly 2.5" of water equivalent fell, with much of it as rain below 4,500ft. On Sunday the 9th, the rain line likely went as high as 6,000ft. Glide cracks opened on a number of slopes with smooth ground or rock slabs. Wet avalanches ran naturally with some becoming large.

As fewer people flock to the mountains this time of year, our data and confidence in our forecast have lowered. Be prepared to make your own assessments as you travel. If you're in the backcountry, let us know what you see by submitting an observation.

Régions couvertes