Date issued

Dec 12, 2017 - 8:00 AM

Valid until

Dec 13, 2017 - 8:00 AM

Prepared by

ross campbell

Still good quality skiing and riding to be had in shielded areas from the wind, on shady aspects.

Regular season
Monday - December 11, 2017
Alpine

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.

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.

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.

Tuesday - December 12, 2017
Alpine

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.

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.

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 - December 13, 2017
Alpine

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.

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.

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?

A temperature inversion continues to bring above zero temps to the alpine. The warm temps, with a nudge from strong solar input, can cause loose avalanches on steep S and W aspects. Rock outcrops will heat up fastest with the sun's rays.

Travel and Terrain Advice
  • Best conditions on sheltered northerly aspects.
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Avalanche Summary

Several loose avalanches up to size 2 were observed on steep solar aspects, especially near rocky outcrops in the last few days. These avalanches have been triggered by warm alpine temps and strong solar heating.

Snowpack Summary

Surface Hoar up to 2cm in size has been observed at tree line in many drainages. The late November crusts are found down 50-80cms and are currently bonding well. The alpine has seen above freezing temps for the last several days and a thin crust can be found on solar aspects. Wind effected snow on the surface has been observed in some valleys.

Weather Forecast

Our persistent ridge of high pressure is finally showing signs of weakening as a weak upper low over the central interior will spread some mid and high cloud across the province . Today we can expect no precipitation, winds in the moderate range from the SW and inverted temperatures in the Alpine.

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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