Bollettino valanghe

Banff Yoho Kootenay

Dec 4 – 5, 2014Parks Canada
Vedi sulla mappa
Archiviato · scaduto 12 years ago

Pericolo valanghe

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

In sintesi

Human triggered avalanches are still likely  due to the instability of recent storm snow sitting over the basal rain crust/facets.  This will not change in the short term.  SH

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2
    Many places have been ravaged by winds from many directions, especially in the alpine.  Watch for pockets of hard slab near ridge tops and cross loaded features..

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–3
    The primary problem in the snowpack is the interface between the recent storm snow and the November 6th and 24th facet/crust interfaces. This is the problem responsible for the majority of the avalanches in the past week. Watch for remote triggers.

Weather Forecast

A warming trend Thursday with daytime highs in the -5 to -10 range.  No snow is expected on Thursday, and light snow amounts of 5-10cm are forecast for Friday and Saturday.  Light to moderate SW winds for the next few days.

Snowpack Summary

Recent storm snow has settled into a soft slab and has significant wind affect in open terrain at treeline and above. The lower half of the snowpack is complex and poorly structured & comprised of the facets (Nov 24th) at the interface of the recent storm snow and a series of thin crusts (Nov 6th) and depth hoar at or slightly above the ground.

Avalanche Summary

No new activity reported, but a natural 2.5 in the Sunshine backcountry yesterday triggered by wind loading shows large natural avalanches are still possible at higher elevations.

Confidence

Due to the number of field observations on Thursday

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