Boletín de aludes

Kananaskis

Mar 20 – 21, 2020Avalanche Canada
Ver en el mapa
Archivado · caducó 7 years ago

Peligro de aludes

Sun
Mon
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado

Lo esencial

Monitor and be aware of solar aspects during the day and avoid these areas when the solar radiation is strong or increasing. Conservative choices are a must, dont push it and dont go for it. The current health care system is under enough stress due to COVID19 pandemic.  

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1.5–2.5

    Wind slabs seem to be everywhere. They are most concerning for human triggering in steep, convex and unsupported terrain.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2

    Loose wet slides will start in the PM with daytime warming. Steep solar slopes especially in thinner areas will be places to avoid. Any small slide may step down to the deeper basal layers. 

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    1.5–3.5

    The deep persistent layer is still a concern, especially in shallow snowpack areas. A large cornice trigger could also be enough to weak up this layer.

Confidence

High -

Weather Forecast

The clear sky showed up early on Friday and as a result, stability decreased throughout the day. Its not uncommon to have it move from mod-low in the cool mornings to Considerable-HIGH in the hot afternoons. Pay close attention to quality of freeze overnight as well as aspect you are on or under. Solar aspects are not a good place to be later in the day.

Saturday is looking to be a carbon copy of Friday but a little less cloud is forecast overnight so the quality of the freeze may be better. Freezing levels will be around 2200m with day time highs around -5C. Watch for solar radiation to decrease stability on solar aspects later in the day.

Avalanche Summary

Several loose wet avalanche up to sz 1.5 were observed on solar aspects in the late pm. Field teams were out of the forecast region by 2:30 and we expect more slides occurred following this time. 

Snowpack Summary

Crusts can be expected on solar aspects up to the peaks. Last weeks few cm of snow has settled and is overlying a temperature crust on all but true north aspects up to 2000m. The mod pack is generally well settled but the concern for the basal facets still persists. Especially in thinner snowpack areas. Most alpine areas are wind affected and the best chance for good snow will be on a sheltered north aspect. 

Terrain and Travel

  • Avoid convexities, steep unsupported terrain and rocky outcroppings.
  • Cornices become weak with daytime heating, travel early on exposed slopes.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Avoid exposure to slopes that have cornices overhead.
  • Be aware of the potential for large avalanches due to the presence of a deep persistent slab.
  • Avoid steep slopes when air temperatures are warm, or solar radiation is strong.

Regiones cubiertas