Bollettino valanghe

Waterton Lakes

Mar 17 – 19, 2015Parks Canada
Vedi sulla mappa
Archiviato · scaduto 12 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

Up high, fresh, thick new storm slabs exist in many start zones: limit your exposure to these until they have some time to settle. Down low, the snowpack is recovering from the heavy rains and will be rapidly effected by any warming. 

Problemi valanghivi

  • Loose Dry

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1
    Skiers in steep terrain can expect the surface snow to sluff. Manage yourself and your group carefully to avoid getting caught by these small avalanches. Avoid terrain where a sluff could trigger a more significant storm slab.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    New slabs sitting on a newly formed crust can be found at all elevations but are much more significant at the upper limits of treeline and the alpine. These will be more reactive in steep or unsupported terrain and may be ripe in many start zones.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    As temperatures increase this week watch for moist snow to develop at lower elevations where most of the snowpack has yet to refreeze. If the sun comes out this will happen quickly on solar slopes.

Weather Forecast

Freezing levels will rise to 1800m Tuesday with up to 10 cm expected late in the day with light winds. Freezing levels will reach 2000m with West winds Wednesday as the precip tapers off midday. Expect some sun and even higher freezing levels on Thursday with a SW flow bringing warming for the end of the week.

Snowpack Summary

20 to 30 cm of new snow now sits above a rain soaked snowpack to 2000m. At higher elevations the amount of moist snow now buried gets shallower and the new snow amounts grow quickly to 60cm at 2200m. A new rain crust has formed as the moist snow begins to refreeze. NE winds deposited the new snow in a reverse loading pattern along ridge crests.

Avalanche Summary

Visibility has been poor for the last few days but some size 2.5 debris piles can be seen below the clouds in the run-outs in several of our large alpine paths. We suspect the storm snow is failing as a soft slab and running on the new rain crust or entraining the moist snow below. The surface snow sluffs easily with skier traffic in steep terrain.

Confidence

Timing or intensity of solar radiation is uncertain on Thursday

Regioni coperte