Date issued

Nov 14, 2017 - 8:01 AM

Valid until

Nov 15, 2017 - 8:00 AM

Prepared by

ross campbell

Heads up as most groups are recreating in one drainage, watch for groups above and below you! Early season hazards are lurking below the snow surface, ski / ride cautiously.

Regular season
Monday - November 13, 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
Tuesday - November 14, 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

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.

Below Treeline
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

Avalanche Problem 1: Storm Slabs

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

35cm of storm snow now covers the Nov 9 interface. Warming temps and increasing south winds will promote the formation of a storm slab. 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

Eleven slab avalanches were recorded yesterday in the Highway corridor, up to size 2.5. These slides started in very steep terrain, mostly dry and made it to the run out zone.

Snowpack Summary

10cm overnight, 35cm now covering the Nov 9 interface, 30-40cm over the Halloween crust at tree line. The crust sits on 30-50cm of rounded grains and mixed forms which seems to be bonding well for the time being. No significant instabilities in the snowpack currently, except for a slowly building storm slab on the surface.

Weather Forecast

Cloudy with sunny periods today and a dusting of new snow. Alpine high of -6 with a rising freezing level to 1400m. Winds will be moderate today gusting to strong from the south. Tomorrow we're expecting 15-20cm with increasing winds and mild temps.

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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