Bulletin d’avalanche

Waterton Lakes

Mar 4 – 7, 2015Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

WIth up to 40cm of new snow over the last week the turns are better than they have been in a long time. Avalanche danger will increase as temperatures and SW winds increase on Wed. Paying attention to the changing conditions will be important.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    New slabs have developed with the recent snow and NE winds, creating windslabs in places they may not usually be seen. As temperatures warm up and SW build more windslabs on Wed and Thur there will be a spike natural avalanche activity.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    With up to 40cm of low density new snow over the last week, any steep slope could see sluffing. These may not be big enough to bury a person but could knock you over and have serious consequences in the wrong place.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    These slabs continue to stand out as a concern in the TL and ALP areas where there is not a strong Jan 31 crust over them (2200m+). Be particularly mindful in thin snowpack areas where this layer is more likely to be triggered.

Weather Forecast

The arctic air will hang around on Tue keeping things cold, dry and only light NE winds. The westerly flow will return on Wednesday and temperatures will start to warm up and strong SW winds. Avalanche activity could increase dramatically with the rise in temperatures and winds.

Snowpack Summary

Another upslope event added 10-15 to the 20cm we received last week. The recent storm came in with mod NE winds creating slabs on W to S slopes. These could be sitting on old windslabs or very slick suncrusts. In sheltered places there is up to 40cm on the Feb 14 crust. Easy sluffing of this new snow was observed in the summit are on Monday.

Avalanche Summary

The new snow has been sluffing out of steep terrain but there has been no evidence of any deeper avalanches.

Confidence

Freezing levels are uncertain

Régions couvertes