Bollettino valanghe

Little Yoho

Mar 29 – 30, 2025Avalanche Canada
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Archiviato · scaduto 2 years ago

Pericolo valanghe

Mon
Tue
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato

In sintesi

Ski quality has gone way up with the new snow, however, the persistent layer of weak facets from Jan has not changed much and continues to be a concern. There is also potential for an increase in hazard with solar heating on Sunday.

Enjoy the fresh snow but continue to approach any steep terrain with caution.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1.5–3.5

    A 90-150 cm slab of dense snow now sits atop the persistent mid-pack facet layer from Jan/Feb. There has been a lot of large avalanche activity on this facet layer, and where it is weak and hasn't yet avalanched, triggering it remains a concern.

  • Loose Dry

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

    The new snow from the past couple of days will sluff easily in steep terain, and will become more reactive with any significant solar heating inputs on Sunday. Minimize or avoid exposure to overhead hazard in any steep or gullied terrain and manage sluffs carefully while skiing.

  • Storm Slabs

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

    15-25 cm of storm snow now buries previous crusts and winds slabs. This new snow could fail as a storm slab in steep terrain, and has potential to step down to deeper weak layers in the snowpack. Any significant solar inputs on Sunday will increase the likliehood of these slabs being triggered.

Confidence

Low

Avalanche Summary

Visibility has been limited for a couple of days, but natural avalanche activity has slowed down due to cooling temperatures and light winds.

Local ski hills reported triggering small storm slabs up to size 1.5 with ski cutting and explosives. Loose-dry avalanches have been reported in steep gullies and on steep faces.

Large whumpfs on the weak Jan/Feb facets continue to be reported in thin areas, and this layer remains a concern.

Snowpack Summary

15-25 cm of storm snow has accumulated over the past two days. This new snow overlies rain and temperature crusts up to ~2500 m.

A 90-150 cm dense slab now sits over a persistent weak layer of facets from Jan/Feb. The facets are rounding but are still a concern, especially in areas with a thinner snowpack. In most areas the lower snowpack is well settled.

Below 1500 m the snowpack is becoming isothermal.

Weather Summary

Saturday night: Cloudy with light flurries and a few cm's of new snow.

Sunday: A mix of sun and cloud. Nil to trace amounts of precipitation. Alpine temps: Low -9 °C, High -1 °C. Ridge wind light from the S/SE around 15 km/h. Freezing level: 2100 m. Possible alpine temperature inversion.

Terrain and Travel Advice

  • Uncertainty is best managed through conservative terrain choices.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.
  • Give the new snow several days to settle and stabilize before pushing into bigger terrain.
  • Avoid terrain traps such as gullies and cliffs where the consequence of any avalanche could be serious.

Regioni coperte