Date issued

Jan 1, 2018 - 3:00 PM

Valid until

Jan 2, 2018 - 2:00 PM

Prepared by

jeremy.mackenzie

A big change in the weather is coming. Temperatures will be near the freezing mark over the next few days. Triggering may be more easy as the snowpack adjusts to this warming.

Regular season
Tuesday - January 2, 2018
Alpine

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Treeline

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Wednesday - January 3, 2018
Alpine

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Treeline

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Thursday - January 4, 2018
Alpine

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Treeline

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Avalanche Problem 1: Loose Dry

What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?

Be cautious in steeper terrain. Sluffs are running far and fast, and may be more likely to be triggered from steep shallow solar aspects when the rocks heat up.

Travel and Terrain Advice
  • Be cautious of sluffing in steep terrain.
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Avalanche Problem 2: Wind Slabs

What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?

Wind slab conditions are highly variable, including hard slabs, soft slabs and buried slabs. Watch for human-triggerable slabs in steep terrain on all aspects, and take the time to evaluate localized conditions.

Travel and Terrain Advice
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Avalanche Summary

Loose dry avalanches up to size 2.0 have been occurring in steep terrain on all aspects at all elevations in the past several days, but there was less activity today. No slab activity noted today, but a few have occurred in the past few days.

Snowpack Summary

Another cold night led to surface facetting. Previous storm snow is settling slowly. Alpine areas have a wide variety of wind slab conditions, including bullet-proof hard slab, recently formed soft slabs and buried wind slabs. At Treeline elevations expect isolated slabs, primarily around ridge-crests. Forecasters continue to track the Dec 15th surface hoar, but due to the lack of an overlying slab this layer has not been overly reactive.....yet. In the lower 1/3 of the snowpack the November and October rain crusts are facetting and remain on the radar for future potential avalanche problems.

Weather Forecast

Finally the warm air seems to be on the way. Tuesday will be mainly cloudy with no precipitation expected. Alpine temperature will reach a high of 0 C, with ridge top winds near 15 km/h from the West. Freezing levels will climb to near 1900m by mid-week.

Danger Ratings Explained

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.

Natural avalanches possible; human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

4 - High

Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.

Natural avalanches likely; human-triggered avalanches very likely.

Large avalanches in many areas; or very large avalanches in specific areas.

5 - Extreme

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

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