Boletín de aludes

North Columbia

Jan 16 – 17, 2023Avalanche Canada
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Archivado · caducó 4 years ago

Peligro de aludes

Wed
Thu
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Continue to make conservative terrain choices and consider the consequences of a chosen slope avalanching. There is variability in the snowpack throughout the region but what is consistent is that the snowpack is shallower and weaker than average.

Problemas de aludes

  • Wind Slabs

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

    Rider triggerable wind slab exists on west, north and east aspects at treeline and above.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1.5–2.5

    As many as 5 concerning weak layers can be found in the top 1.5m of the snow pack. Recently the most reactive layers have been a layer of surface hoar buried on January 12th and a layer of surface hoar and a crust buried at the start of the month.

    This is a complicated and weak snowpack. Several of these layers are at a prime depth for human triggering. Keep this in mind when deciding what slopes to ride and always consider the consequences if the slope does avalanche.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–3.5

    A layer of large and weak facets sits near the base of the snowpack. This layer has most recently been problematic in lower alpine elevations.

    Avoid thin and rocky start zones where weak layers sit closer to the surface, riders are most likely to trigger an avalanche on this layer in terrain with shallow or variable snow depths or by first triggering a layer further up in the snowpack.

Avalanche Summary

We continue to recieve reports of Friday's natural cycle. Avalanches ran on all aspects and elevations. Most of the activity was on the 2 Surface hoar layers from January but there was also activity on the November facets near the bottom of the snowpack. Avalanches ranged in size from 1.5 to 3.5.

In addition to the natural avalanches there was also several skier remotes, accidentals and ski cuts. These avalanches were generally up to size 2 and were triggered on one of the 2 surface hoar layers buried in January.

Confidence

Moderate

Snowpack Summary

A recent layer of surface hoar and a crust on south facing slopes can be found under 20 to 60cm of new dense storm snow at treeline and above. Wind slabs exist on North, west and east facing terrain at treeline and above. As the freezing level falls a new crust will form below 1800m.

There are 4 additional weak layers in the snowpack. The most reactive in recent days have been the layer mentioned above and another surface hoar layer from early January. The bottom of the snowpack is made up of large facets buried in late November, This layer remains a concern. In General this years snowpack is complicated, weak and shallow. Keep this in mind as you move through the mountains.

Weather Summary

Sunday Night

Cloudy with flurries bringing trace amounts of new snow. Light southerly winds and a Low of -4 at 1800m.

Monday

Cloudy with flurries bringing up to 5cm of new snow. Light southerly winds and freezing levels rising to 1500m.

Tuesday

Mostly cloudy with the possibility of light flurries bringing trace amounts of new snow. Light southwest winds and a high of -4 at 1800m.

Tuesday

Mostly cloudy withlight flurries bringing trace amounts of new snow. Light southwest winds and a high of -4 at 1800m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be especially cautious as you transition into wind affected terrain.
  • Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.
  • Uncertainty is best managed through conservative terrain choices at this time.

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