Bollettino valanghe

South Rockies

Avalanche Canada
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Pericolo valanghe

Mon
Tue
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

Buried persistent layers bring uncertainty as warm temperatures continue.

Avoid exposure to large, overhanging cornices and steep, rocky start zones in the alpine.

Problemi valanghivi

  • Cornices

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

    Cornices are large and fragile, and may trigger large avalanches on the slopes below.

  • Persistent Slabs

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

    Triggering this layer of facets over a hard crust (50-70 cm deep) is most likely on steep slopes with a shallow snowpack. Large triggers like cornices falls are also a concern.

Confidence

Moderate

  • We are uncertain about how persistent slabs will react to the forecast weather.
  • We are uncertain due to a limited number of field observations.

Avalanche Summary

No new avalanches were reported on Thursday or Friday.

On Wednesday, our field team reported a very large (size 2.5) persistent slab avalanche triggered by a cornice fall on Window Mountain, likely occurring on Tuesday, see photo below. Another large avalanche was observed on Saturday, most likely on the buried weak layer.

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

Snowpack Summary

A lack of overnight refreeze will likely keep the snow surface moist/wet to mountain top.

A layer of weak facets above a crust is buried 50-70 cm deep. This remains a concern for triggering in the alpine by large loads such as a cornice fall or snowmobile in steep and rocky terrain.

Facets exist at the base of the snowpack in shallow areas. Snowpack depth tapers rapidly at lower elevations.

Weather Summary

Saturday Night
Mostly cloudy. 2 mm of rain. 30 km/h southwest ridgetop wind. Treeline temperature 2 °C. Freezing level 2500 m.

Sunday
Cloudy. 1 to 2 mm of precipitation as snow or rain at treeline. 20 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 2000 m.

Monday
Mix of sun and clouds. 1 mm of precipitation as snow or rain at treeline. 10 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 2100 m.

Tuesday
Mostly cloudy. 5 mm of precipitation as snow or rain at treeline. 50 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 2100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Cornice failures could trigger large and destructive avalanches.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and slopes above cliffs.

Regioni coperte