Bollettino valanghe

Banff Yoho Kootenay

Feb 13 – 14, 2014Parks Canada
Vedi sulla mappa
Archiviato · scaduto 13 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

Small natural cycle occurring in the alpine.  Very touchy wind and storm slab condition exists.  It's definitely time to pick more conservative lines or routes.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely - Certain
    Dimensione
    1–2
    The 10-20 cm of new snow has created touchy windslabs up to 30 cm thick with impressive propagations for their small size.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    The new snow now has enough cohesion in some locations to act as a soft slab on steeper features not affected by the wind.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2
    This dormant layer may start to wake up over the next few days with continued snow and wind loading, we are monitoring it closely. It is a weak basal facet layer that is a problem on the East side of the Divide (Lake Louise area).

Weather Forecast

Another 5 cm forecasted for Thursday and 5 for Friday with moderate to strong SW winds is forecasted for the next few days.

Snowpack Summary

A touchy 15-30 cm soft wind/storm slab is not bonding well to underlying surfaces (surface hoar, facets, and suncrust) formed from the past three weeks of cold, dry weather. With additional snow forecast over the next few days, expect the soft slabs to increase in depth and size.

Avalanche Summary

A natural cycle was occurring in the alpine, but visibility was poor. Across the region, several soft touchy windslabs 15-30 cm deep (size 1.5) have been ski cut on all aspects above treeline. Propagations were generally 10-40 m. A general observation was small avalanches were running far an fast, up to 700 m in one case in KNP.

Confidence

Due to the quality of field observations

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