Boletín de aludes

North Columbia

Mar 19 – 20, 2023Avalanche Canada
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Archivado · caducó 4 years ago

Peligro de aludes

Tue
Wed
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Lo esencial

Lingering wind slabs may remain reactive to human triggers in isolated locations at upper elevations.

Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Problemas de aludes

  • Wind Slabs

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

    Lingering wind slabs may remain reactive to human triggers in isolated locations at upper elevations.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    2.5–4

    A weak layer of facets exists near the base of the snowpack. The likelihood of human triggering is low given the layer's depth, but large triggers such as cornice failures or smaller avalanches in motion have the potential to produce very large avalanches with surprisingly wide propagation. Suspect terrain for human triggering includes steep, shallow, and rocky terrain where the snowpack transitions from thin to thick.

Confidence

High

Avalanche Summary

A naturally triggered size 2 wind slab was reported on a north aspect in the alpine on Saturday.

Additionally, two natural and numerous explosive triggered cornice falls up to size 2.5 were reported on north aspects in the alpine. None of them triggered slabs on the slopes below.

A remotely triggered size 2 storm slab avalanche was reported on a north aspect in the alpine on Friday. The slab was 30-40 cm deep and failed on a crust. See MIN.

Snowpack Summary

Expect to find a melt-freeze crust on the surface of all aspects at treeline and below and on sunny aspects in the alpine. Solar radiation will break down the crust on sunny slopes throughout the day.

Lingering wind slabs may remain reactive to human triggers in isolated locations at upper elevations.

30-50 cm down there is a sun crust on sunny aspects and surface hoar (3-10 mm) on isolated shady and sheltered slopes.

The mid-snowpack is generally strong but the lower snowpack is a different story..

The November facets are still prominent at the base of the snowpack. They are showing signs of improving but this layer remains a significant concern in rocky, shallow, or thin to thick snowpack areas at treeline and above.

Weather Summary

Sunday Night

Partly cloudy / 20 km/h east ridgetop wind / Temperature at treeline around -6 C / Freezing level valley bottom

Monday

Mix of sun and cloud / 20 km/h northeast ridgetop wind / Temperature at treeline around -3 C / Freezing level 1700 m

Tuesday

Sunny / 10 km/h north ridgetop wind / Temperature at treeline around -3 C / Freezing level 1700 m

Wednesday

Sunny / 10 km/h north ridgetop wind / Temperature at treeline around 0 C / Freezing level 2000 m

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.
  • A moist or wet snow surface, pinwheeling and natural avalanches are all indicators of a weakening snowpack.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Cornice failure may trigger large avalanches.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

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