Date issued

Nov 3, 2017 - 3:00 PM

Valid until

Nov 4, 2017 - 2:00 PM

Prepared by

jeremy.mackenzie

It's winter! This means its time to carry your avalanche safety gear and choose terrain wisely. We are reluctant to use hazard ratings due to our very limited field observations, but the current avalanche problems deserve attention.

Early Season Conditions
Early Season

Insufficient observations exist to reliably rate the avalanche danger. Expect shallow snow cover with thinly buried rocks and trees just beneath the surface. Avalanche danger often concentrates in gullies and other deposition areas, where windslabs may bond poorly to a weak underlying base. Deeper snow usually exists at higher elevations.

More Early Season Details

Avalanche Problem 1: Wind Slabs

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

Fresh wind slabs are likely to be found in gullies and other terrain features that held wind deposited snow from previous storms. Also look for slabs immediately below ridge-crest. As winds shift to the SW expect more widespread slab development.

Travel and Terrain Advice
  • Be very cautious with gully features.
  • Be careful with wind loaded pockets while approaching and climbing ice routes.

Avalanche Problem 2: Loose Dry

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

This will be a problem in steep terrain. Early season ice climbers should watch for sluffing.

Travel and Terrain Advice
  • Be cautious of sluffing in steep terrain.

Avalanche Summary

Nothing noted, but visibility was very limited.

Snowpack Summary

Prior to this current storm, we had 10-20cm of wind blown snow that began to fill gullies and alpine bowls. This most recent snow now sits on either bare ground, or these previously wind deposited gully and bowl features. Recent winds have been mostly from the north, expect freshly formed wind slabs on SE to SW aspects. Snow depths at 2200m range from 30 to 60cm. Sheltered areas and confined gullies are capable of loose dry sluffs in steep terrain.

Weather Forecast

A mix of sun and cloud is expected for Saturday with cool temperatures and light SW winds. Sunday will be similar, but with scattered light flurries.

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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