Bollettino valanghe

Jasper

Nov 28 – 29, 2017Parks Canada
Vedi sulla mappa
Archiviato · scaduto 9 years ago

Pericolo valanghe

Wed
Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Snow and wind have developed a reactive layer that when triggered has the ability to step down to deeper instabilities. A cautious approach to avalanche terrain is recommended. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    Sensitive wind slabs building quickly at ridge tops and if triggered, has the potential to step down to the deeper instability.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–3
    This is a complex problem which is hard to assess and predict. Give yourself a wide margin and make conservative terrain choices. Below treeline this layer is only a concern if you are in a run out zone of a large avalanche path.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    Storms slabs continue to be an issues as the recent snow settles. Cooler temperatures over the next few days will help heal this problem.

Weather Forecast

A cooler and drier air mass is back over the region under a SW flow. Some flurries, moderate gusting strong (ridge top) winds. Overnight snow flurries with freezing levels to the valley bottom. Alpine lows of -13. Winds moderate SW gusting Strong.

Snowpack Summary

Storm slabs and windslabs have formed over the past 24 hours with wind effected snow specific to exposed lee features - these two problems sit on a recently developed rain crust 30 - 60 deep. A persistent slab between 40cm-150cm thick sits on the Halloween Crust, low in the snowpack. This crust can be found up to 2,700m depending on its location.

Avalanche Summary

Explosive control work on highway 93 produced results to sz 2.5. We observed avalanches releasing from new windslab as well as one deeper slab avalanche releasing on the Halloween crust. Minimal natural avalanche activity was noticed.

Confidence

Regioni coperte