Bollettino valanghe

Northwest Inland

Avalanche Canada
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Pericolo valanghe

Sat
Sun
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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In sintesi

Dangerous avalanche conditions are expected late in the day as freezing levels continue to rise.

Conditions will deteriorate sooner than expected if a strong crust does not form overnight.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1.5–2.5

    Cornices will weaken with daytime warming and solar input.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–3.5

    A layer of weak, faceted snow with a firm crust is buried 100 to 200 cm deep and continues to periodically produce large avalanches. Warming temperatures and solar radiation may increase its reactivity.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2

    Wet loose avalanches are most likely during periods of direct solar radiation and as temperatures rise through the day. In areas lacking a solid overnight freeze, avalanche activity may begin much earlier than expected.

Confidence

Low

  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.
  • We are uncertain about how the timing or intensity of warming will affect the snowpack.
  • We are uncertain due to a limited number of field observations.

Avalanche Summary

No new avalanches reported.

We suspect the current weather is driving the avalanche danger in the afternoons, producing wet loose avalanches up to size 2.

Large (up to size 3) persistent slab avalanches have been reported periodically over the past couple of weeks, likely during periods of warming, solar radiation, and/or wind loading. The most recent report occurred within the past few days on an east aspect at approximately 1700 m (see photo below for details).

Snowpack Summary

A widespread surface crust is expected to form overnight at treeline and above, with crust thickness and strength varying with the quality of the overnight refreeze. Isolated north-facing areas in high-alpine terrain may still hold pockets of dry, loose surface snow.

Below treeline, a limited or lack of overnight refreeze will result in a moist or isothermal upper snowpack.

A layer of weak, sugary snow over a thick crust is buried 100 to 200 cm and continues to produce large, surprising avalanches.

With daytime warming and sun, the snowpack will weaken throughout the day.

Weather Summary

Thursday Night
Clear skies. 20 km/h east ridgetop wind. Treeline temperature 2 °C. Freezing level 1800 m.

Friday
Sunny. 20 km/h east ridgetop wind. Treeline temperature 2 °C. Freezing level 2200 m.

Saturday
Mostly sunny. 20 km/h east ridgetop wind. Treeline temperature 5 °C. Freezing level 2500 m.

Sunday
Mostly sunny. Chance of light rain at treeline. 10 km/h east ridgetop wind. Treeline temperature 5 °C. Freezing level 2300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Think carefully about your exit plan from the backcountry because avalanche danger is expected to increase throughout the day.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Avalanche danger will increase as the surface crust breaks down.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

Regioni coperte