Avalanche Forecast

South Rockies

Date issued

Dec 15, 2017 - 3:53 PM

Valid until

Dec 16, 2017 - 2:00 PM

Prepared by

swerner

Even though the avalanche hazard is LOW, pockets of unstable snow could be found in isolated terrain features. Early season hazards with a shallow snowpack are still encountered.

Regular season
Friday - December 15, 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.

Saturday - December 16, 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.

Sunday - December 17, 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 Summary

No new avalanche activity.

Submit your observations to the Mountain Information Network.

Snowpack Summary

Isolated pockets of wind slab may be found on easterly aspects in the alpine, while windward slopes have been scoured down to the old rain crust or rock. Sun crusts have formed on southerly slopes and in sheltered treeline and below treeline terrain, very large feathery surface hoar and surface facets (sugary snow) exist. These crystals do not pose hazard to us now, but once they get buried by new snow they can form a weak layer that could become reactive later.

The two crusts that were buried near the end of November can now be found approximately 15-20 cm down. A third crust from the end of October exists as a "facet/crust" combo near the base of the snowpack approximately 50-100 cm down and recent snowpack tests done on this layer are showing hard to no significant results. These rain crusts will likely be with us all winter but may not pose a problem until we see a significant change in the weather.

Check out this video from our South Rockies Field Team.

Weather Forecast

Saturday: Mix of sun and cloud. Alpine temperatures -10. Ridgetop wind moderate from the west.

Sunday: Cloudy with sunny periods and isolated flurries. Snow accumulations vary through the region with 2-5 cm in the north and 5-10 cm in the south. Alpine temperatures near -10. Ridgetop wind moderate to strong from the west.

Monday: Mix of sun and cloud. Alpine temperatures near -10. Ridgetop wind strong from the west.

Check out the Mountain Weather Forecast for more detail.

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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