Boletín de aludes

Northwest Inland

Dec 19 – 20, 2017Avalanche Canada
Ver en el mapa
Archivado · caducó 9 years ago

Peligro de aludes

Thu
Fri
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
Abrir el mapa completo

Lo esencial

While conditions are generally good, extra caution is warranted in windy areas and around convoluted rocky areas with a shallow snowpack.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–2
    Wind slabs are most likely to be found immediately lee of ridge crest and around mid-slope terrain features like rock outcroppings. While relatively small, they could be problematic in complex terrain.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–3
    The late October crust lies near the base of the snowpack and while it should be gaining strength a heavy trigger in a thin rocky terrain feature may still be able to initiate a failure and subsequent large avalanche.

Confidence

Low - Due to the number of field observations

Weather Forecast

Wednesday: Dry with some clear spells until late in the day. Strong northwesterly winds. Models indicate a weak inversion may set up for Wednesday afternoon with valley temps around -12C and alpine temps more like -5C. Thursday: Light snow, 2-4 cm expected, clearing thorough the day. Winds remaining strong northwesterly. Treeline temps around -12C. Friday: Cold and dry. Light easterly winds. Treeline temps around -20C.

Avalanche Summary

Some natural and skier-triggered avalanche activity was noted from the weekend - it appears as though it can be characterized as small wind slab activity. If you're out in the mountains and see recent avalanches please snap a photo and submit your information to the Mountain Information Network.

Snowpack Summary

The inland region picked up 5 to 15cm of new snow over the weekend accompanied by wind that was initially out of the west, but has since switched to being out of the southeast. This new snow rests on a wide variety of old surfaces including small facets, crusts on solar aspects and stubborn old wind slabs near ridge crest. In protected areas below 1500m the new snow may be sitting on previously formed feathery surface hoar.Two crusts formed near the end of November are found approximately 30 to 50cm below the surface. These crusts are widespread and extend into the alpine. Previous snowpack tests produced hard results on these crusts, but we have not seen any recent information about their sensitivity to triggering. Below these crusts, a well settled mid-pack overlies the late October crust which is down near the ground. The October crust is widespread and has not been reactive to human triggering since the end of November. Average snowpack depths in the region are between 80 and 140cm at treeline, with up to 160cm in the alpine.

Regiones cubiertas