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Archived

Avalanche Forecast

Jan 25th, 2020–Jan 26th, 2020
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

The snowpack is highly variable. The basal weakness is still giving sudden results and the bridging of the mid pack remains questionable.

Weather Forecast

Tonight and Sunday will see trace amounts of snow light SW winds and steady cooling.

Monday/Tuesday: Temps will continue to drop to -11 and SW  winds.

For more detailed analysis: Mountain Weather Forecast

Snowpack Summary

The snowpack is highly variable across the forecast area. The surface snow is becoming more cohesive and is bonding well. The upper snowpack remains mainly facetted, particularly in shallow areas where there is less than 60cm of snow. There is inconsistent bridging in the mid-pack over the weak basal facets and depth hoar.

Avalanche Summary

A road patrol of Maligne lake road showed no new signs of avalanche activity. Wednesday's helicopter flight observed only two recent large cornice failures that initiated avalanches in the weak basal facets and one windslab avalanche.

Confidence

The weather pattern is stable

Avalanche Problems

Wind Slabs

Continued mod SW winds have created new wind slabs,

  • Avoid lee and cross-loaded terrain near ridge crests.
  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: North, North East, East, South East, North West.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

This is a complex problem. The spacial variability and potential consequences of triggering a large avalanche on this layer makes it extremely difficult to gain confidence in the snowpack. Consider this before entering bigger features.

  • Avoid convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3