Date issued

Nov 13, 2017 - 8:16 AM

Valid until

Nov 14, 2017 - 8:00 AM

Prepared by

mark herbison

Recent snow accumulation, warming temps and forecasted increasing winds promoting a formation of a storm slab.

Early season hazards are lurking below the snow surface, ski / ride cautiously.

Regular season
Sunday - November 12, 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
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

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?

25cm of storm snow now covers the Nov 9 SH (reported up to 20mm at TL, but not found in recent snow profiles). Warming temps and increasing south winds will promote formation of a storm slab. Keep a keen eye out for changing conditions over the day.

Avalanche Summary

No natural or rider triggered avalanches have been reported.

Snowpack Summary

10cm overnight, 25cm now covering the Nov 9 SH (spotty in distribution, hard to find), 35-50cm over the Halloween crust at treeline. The crust sits on 50-70cm of mixed forms and for the time being is well bonded. The lower snowpack is a 20cm layer of melt frozen crust. Snowpack is 90-130cm above 1900m.

Weather Forecast

Snow today with accumulation up to 12cm by this evening. Alpine high of -2 with a rising freezing level to 1800m. Winds are forecasted to pick up over the day, 20km/hr gusting to 60km/hr from the south. Light snow to continue through Monday night and into Tuesday with another 25cm on Wednesday.

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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