Bollettino valanghe

South Rockies

Avalanche Canada
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Pericolo valanghe

Sat
Sun
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 5 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Cornice failures may trigger very large persistent slabs on the slopes below.

Avoid traveling underneath them, especially when the weather is hot and sunny.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2.5

    Cornice failures could trigger very large persistent slabs on the slopes below.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3

    Weak facets over a hard melt-freeze crust may be found 50 to 70 cm deep. Triggering this layer is most likely on steep slopes with a shallow snowpack or with a large trigger, like a falling cornice.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–1.5

    Strong solar radiation combined with high freezing levels will increase the likelihood of wet avalanches.

Confidence

Moderate

  • We are uncertain about how quickly persistent slabs are gaining strength.

Avalanche Summary

On Wednesday, our field team spotted large (size 2.5) persistent slab avalanche triggered by a cornice fall on Window Mountain. It likely occurred on Tuesday. See photo below.

On Sunday, a very large persistent slab avalanche released naturally near Crowsnest Pass. See the photos for more information.

Observations from this region are currently very limited. Please consider submitting a MIN to let us know what you're seeing out there.

Snowpack Summary

Poor overnight crust recovery and strong solar radiation mixed with high freezing levels are increasing the likelihood of cornice failures and wet avalanches.

A hard surface crust exists up to at least 2100 m on northerly aspects, and right up to mountaintops on sunny aspects.

Triggering persistent slab avalanches in the alpine on weak facets above a crust down 50 to 70 cm remains a concern. These are most likely to be triggered by heavy loads (like a cornice) or a snowmobile in steep, rocky, alpine terrain.

Below this, the snowpack is generally well consolidated. However, facets exist at the base of the snowpack in shallow areas.

Weather Summary

Thursday Night
Clear skies. 20 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 2100 m.

Friday
Sunny. 20 km/h west ridgetop wind. Treeline temperature 4 °C. Freezing level 2800 m.

Saturday
Mostly sunny. 20 km/h southwest ridgetop wind. Treeline temperature 6 °C. Freezing level 3000 m.

Sunday
Mostly cloudy. 10 km/h south ridgetop wind. Treeline temperature 1 °C. Freezing level 2300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Cornice failures could trigger large and destructive avalanches.
  • Avoid travelling on slopes below cornices.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Avalanches could start at higher elevations and travel into below treeline terrain.

Regioni coperte