Bollettino valanghe

Glacier

Jan 10 – 11, 2023Avalanche Canada
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Archiviato · scaduto 4 years ago

Pericolo valanghe

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

In sintesi

Soft wind slabs are present at immediate ridge top and their lee features.

Persistent weak layers may be triggered from shallow, rocky areas. 'Whumpfing' is a clue that you're tapping into these layers of concern.

Problemi valanghivi

  • Wind Slabs

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

    5-10cm of snow and moderate Southerly winds Sunday night into Monday formed fresh wind slab in the alpine and into the tree line. If triggered these wind slabs could step down to deeper instabilities.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2.5

    30-60cm of settled snow buries the Dec 23 facet interface. This layer will be a concern in thin rocky areas, on convex rolls, or in areas where the snowpack is unsupported.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–3.5

    The Nov 17 layer, down 60-120cm, consists of facets, a rotting crust in some locations, and decomposing surface hoar. Though becoming less likely to trigger, the resulting avalanche would be quite destructive.

Confidence

Moderate

Avalanche Summary

No human-triggered nor natural avalanches have been reported in the last few days.

Snowpack Summary

5-10cm of new snow has freshened up the surface. This sits on a settled, in some places wind-affected, upper snowpack.

The December 23rd facet interface is down ~60cm and appears to be gaining strength, but remains a concern in shallow snowpack areas.

The November 17th facet/crust/surface hoar layer is down ~100cm and has become less reactive in snowpack tests, though when it does fail it is 'sudden' in character.

Weather Summary

Isolated flurries continue to get burped over from the Pacific, but not amounting to much snow here.

Tues: sun and cloud, trace snow, Alp high -6*C, 1100m FZL, light SE winds

Wed: sun and cloud, Alp high -4*C, 1200m FZL, light to moderate S winds

Thurs: flurries, 10-15cm snow, Alp high -3*C, 1600m FZL, moderate SW winds

Terrain and Travel Advice

  • Be carefull around freshly wind loaded features.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.

Regioni coperte