Bollettino valanghe

South Rockies

Apr 6 – 7, 2021Avalanche Canada
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Archiviato · scaduto 5 years ago

Pericolo valanghe

Thu
Fri
Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole

In sintesi

Watch for cornices and reactive slabs in wind-drifted areas near ridgetops. 

Problemi valanghivi

  • Wind Slabs

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

    Small wind slabs may lurk on slippery crusts on lee features below alpine ridgetops, formed by recent convective flurries and southwest winds.

  • Cornices

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

    Cornices are large and looming along many ridgelines. They are capable of triggering large avalanches when they fail.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

Tuesday night: Clear, moderate southwest wind, treeline temperatures near 0 C, freezing level staying elevated at 1800 m.

Wednesday: Increasing cloud, isolated light afternoon flurries with trace accumulations, strong southwest wind, treeline temperatures rising to 3 C, freezing level rising to 2200 m and dropping to valley bottom.

Thursday: Mainly cloudy, 10-20 cm of snow, light west wind, treeline temperatures near -5 C, freezing level rising to 1500 m and dropping to valley bottom.

Friday: Mainly sunny, moderate southwest wind, treeline temperatures near-2 C, freezing level rising to 1800 m and dropping to valley bottom.

Avalanche Summary

On Monday and Tuesday, small wet loose avalanches were observed on steep sun-exposed slopes.

Snowpack Summary

Small wind slabs may be found on lee features below alpine ridgetops. Cornices are large, looming, and capable of triggering avalanches when they fail.

Sunny alpine slopes become moist on Tuesday with strong sun and warm temperatures. 5-15 cm of recent dry snow can still be found at upper elevations in shady north-facing terrain. 

The mid-pack is firm and well settled. Some faceted snow and a decomposing melt-freeze crust can be found near the base of the snowpack. Snow line is gradually creeping up to higher elevations.

Glide cracks releasing as full depth glide slab avalanches become more common in the spring and are extremely difficult to predict. Best practice is to avoid slopes with glide cracks.

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Regioni coperte