Bollettino valanghe

Banff Yoho Kootenay

Nov 22 – 23, 2018Parks Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

If we get more snow than forecasted, watch for touchy storm slabs as it is falling on a widespread surface hoar layer. This may become a layer to watch if it's not all blown away before it is buried.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2
    The wind slab problem seems to be most active in Eastern areas where there was more wind effect during the Nov. 18th. wind event.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5
    We are seeing occasional skiier triggered , and explosive controlled avalanches on the Oct 26 crust at local ski areas. This problem seems to be most reactive in areas where the wind has created more of a slab on top of it.

Weather Forecast

A SW flow is bringing some precipitation our way. Models are showing 2-10 cm on Thursday and an additional 5 cm on Friday. Northern areas should see the highest snow amounts. Winds should ease to moderate from the SW with the incoming storm and then switch to NW with colder temps on Friday midday. Saturday looks colder and drier.

Snowpack Summary

15-30 cm of facetted surface snow with surface hoar forming at all elevations. Wind effect at treeline and above has scoured ridge crests and created wind slabs in the alpine. The Oct 26 crust is roughly 30 cm above the ground with facets above and below it. It is present up to 2800m on shady aspects, and at higher elevations on solar aspects

Avalanche Summary

A large avalanche was observed on the N face of Mt. Stanley. Forecasters on a trip into the lake louise backcountry on Tuesday had several whumphs in alpine and treeline areas that had been wind affected and remote triggered a size 2 on a NE aspect at 2300m that failed on facets near the ground

Confidence

Intensity of incoming weather systems is uncertain on Thursday

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