Bulletin d’avalanche

Jasper

Apr 9 – 10, 2018Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

If you find signs of reactivity in the persistent slab share your findings on the MIN, it could save someone else from getting surprised...

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5
    Moderate south west winds in the alpine continue to build fresh pockets of wind slab.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Persistent slabs sitting on facets on Northerly aspects continue to show isolated signs of reactivity. Travel on large Northerly features at treeline and in the alpine is not recommended.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–1.5
    Expect natural avalanche activity during periods of rain.

Weather Forecast

A series of weak fronts pass over the Park under a SW flow, bringing warm unsettled weather with some precipitation. Tuesday we will see sunny breaks in the morning, followed by flurries in the afternoon/evening (up to 7 cm snow/rain below 2100m). Alpine temps will be a low of -7C, high 0C. Ridge winds will be light (gusting strong) from the SW.

Snowpack Summary

Fresh wind slabs continue to build in high alpine areas. In the upper snowpack a 25 to 80 cm thick slab bridges the March 15th persistent weak layer (facets on polar, sun crust on solar). Recent warming has promoted rounding in the upper snowpack, however the mid and lower snowpack remain weak and facetted from this winters prolonged cold periods.

Avalanche Summary

We received a report of large slab avalanche on Monday in the North bowl of Whistler peak. It was remotely triggered from the ridgetop and failed as a size 2.5 persistent slab (suspect Mar 15th interface), 60cm deep by 75m wide, which ran down to treeline. Some size 1 moist surface sluffing was noted on steep solar aspects on Sunday.

Confidence

Intensity of incoming weather systems is uncertain

Régions couvertes