Bollettino valanghe

Kootenay Boundary

Dec 17, 2019Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 7 years ago

Pericolo valanghe

Thu
Fri
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Two persistent weak layers are at play in the region - but neither of them are giving consistent feedback. A tricky situation! Avoid overthinking the problem and instead seek out lower angle terrain while maintaining diligent travel practices.

Problemi valanghivi

  • Persistent Slabs

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

    There are two prominent weak layers in the snowpack right now that are of concern. The first is a layer of surface hoar that was buried last week, and is approximately 20-30 cm deep. The second is a persistent weak layer that is now buried 50-60 cm. Both layers could potentially be reactive to human triggers. Be aware that if the shallower layer is triggered, it may step down to the deeper layer, resulting in a large avalanche.

Confidence

High -

Weather Forecast

MONDAY NIGHT: Cloudy with isolated flurries and a trace to 5 cm of new snow. Moderate southwest winds.

TUESDAY: A mix of sun and cloud with isolated flurries and a trace of new snow. Strong southwest winds. Alpine high temperatures around -6

WEDNESDAY: Mainly cloudy. Light to moderate south winds. Alpine high temperatures around -6.

THURSDAY: Cloudy with isolated flurries and a trace of new snow, increasing overnight. Light to moderate southwest winds. Alpine high temperatures around -5.

Avalanche Summary

There were reports of a size 1 human triggered avalanche, and natural size 2 avalanche on Saturday that released on the persistent weak layer that is down about 50-60 cm

There were a few reports of explosives triggered storm slab avalanches up to size 2 on Friday.

There were a few human and explosives triggered storm slab avalanches size 1-2 reported on Thursday.

Check out this MIN report of an avalanche in the Big White backcountry on Thursday.

Snowpack Summary

15-30 cm of recent snow sits on a weak layer of feathery surface hoar in many sheltered areas, and on a crust on steep south facing slopes. This layer may be reactive to human triggers, especially where wind loading has formed a deeper slab above it.

There is also a persistent weak layer down approximately 60-100 cm that mainly consists of a crust with sugary faceted snow on top of it. This layer is more likely to be reactive to human triggers in shallow, rocky areas.

Regioni coperte