Avalanche Forecast

Issued: Jan 4th, 2017 4:33PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs and Persistent Slabs.

Avalanche Canada cam_c, Avalanche Canada

Persistent weaknesses deeper in snowpack still can't be totally trusted. Approach big open slopes with caution, especially in shallow snowpack areas.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

THURSDAY: Cloudy with isolated flurries bringing trace accumulations throughout the day with 3-5 cm overnight, light southwesterly winds, alpine temperature around -10.FRIDAY: Cloudy with isolated flurries bringing trace amounts of fresh snow, light southerly winds, alpine temperature around -10.SATURDAY: Cloudy with isolated flurries and trace amounts of fresh snow, light southeasterly winds, alpine temperature around -10.

Avalanche Summary

No new avalanches have been reported. Lingering wind slabs may remain reactive to human triggering on specific features, such as the immediately lee of ridges and sun-exposed slopes.

Snowpack Summary

Surface hoar is growing and the upper snowpack is faceting. In exposed areas at all elevations, recent winds have resulted in scouring, hard wind slabs, and thicker reactive wind slabs in unusual places as the winds shifted from west to northeast. Continued moderate to strong northerly winds have been keeping wind slabs fresh and touchy in some areas and sun-exposure is likely making the wind slabs extra touchy on south-facing slopes. Facets and/or surface hoar buried mid-December recently gave moderate but broken snowpack test results where it was found down a metre or more. In a shallow snowpack area, recent snowpack tests gave moderate sudden collapse results on this persistent weakness. This suggests that the primary concern for persistent slab avalanches is in shallow snowpack areas; however, the potential for step-down avalanches remains where it is deeper. The lower snowpack is well bonded and features a thick rain crust near the ground.

Problems

Wind Slabs

An icon showing Wind Slabs
Touchy wind slabs are lurking below ridge crests and behind terrain features on all aspects. Watch for wind slabs in unusual places, including open areas at lower elevations.
Minimize exposure to sun exposed slopes when the solar radiation is strong.Avoid travelling in areas that have been reverse loaded by winds.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Persistent Slabs

An icon showing Persistent Slabs
Triggering a weak layer of facets and/or surface hoar buried mid-December may still be possible in parts of the region where the snowpack is shallower. Dig down and test for weaknesses before committing to any big open steep slope.
Avoid convexities or areas with a thin or variable snowpack.Choose regroup spots that are out of avalanche terrain.Minimize exposure to steep, planar south facing alpine slopes.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Unlikely

Expected Size

2 - 3

Valid until: Jan 5th, 2017 2:00PM

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