Date issued

Nov 15, 2017 - 8:14 AM

Valid until

Nov 16, 2017 - 8:00 AM

Prepared by

ross campbell

This morning's hazard is Moderate, but will rise to Considerable this afternoon. Still, early season conditions, ski and ride cautiously.

Regular season
Wednesday - November 15, 2017
Alpine

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.

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
Thursday - November 16, 2017
Alpine

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.

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
Friday - November 17, 2017
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

Avalanche Problem 1: Storm Slabs

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

35cm of storm snow now covers the Nov 9 interface, plus another 10cm falling today. Warming temps and increasing winds will promote slab formation. Keep a keen eye out for changing conditions over the day.

Travel and Terrain Advice
  • Use caution in alpine and open treeline lees. Recent snowfall has created storm slabs.

Avalanche Summary

No new avalanche activity observed yesterday in the Highway corridor or reported from riders in the backcountry. Still minimal observations!

Snowpack Summary

At treeline, we've seen roughly 30 cm of recent storm snow and the Halloween crust is now buried approximately 60 cm. The Halloween crust sits on 30-50cm of rounded grains and mixed forms which seems to be bonding well for the time being. Below treeline, the height of snow diminishes quickly below 1700m. No recent Alpine observations.

Weather Forecast

As a low-pressure system pushes inland from the Pacific we should see, 10cm of new snow today and another 10cm tonight. Winds will be moderate out of the South gusting to strong and the freezing level will rise to 1200m. Incremental snowfalls will continue through the week, temperatures will gradually fall with moderate westerly winds.

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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