Avalanche Forecast

South Rockies

Date issued

Dec 17, 2017 - 5:30 PM

Valid until

Dec 18, 2017 - 2:00 PM

Prepared by

ghelgeson

While unlikely, if storm totals exceed 15cm on Monday then the danger rating will be moderate at all elevation bands as fresh storm slabs begin to form.

Regular season
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.

Monday - December 18, 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

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.

Tuesday - December 19, 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

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.

Avalanche Summary

No new avalanche activity reported.

If you're out and about please help us out by submitting 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.  In sheltered terrain at and below treeline very large feathery surface hoar and sugary facets are on the surface.  The two crusts that were buried near the end of November can now be found approximately 15 to 20cm below the surface. A third crust from the end of October exists near the base of the snowpack.  Recent testing on this crust did not produce significant results. 

Check out this video from our South Rockies Field Team.

Weather Forecast

Zonal flow should be firmly established by Monday morning.  Two pulses established within this flow are expected to deliver modest quantities of snow and wind to the South Rockies through Tuesday evening.  The models currently show 5 to 10cm for each 12 hour period between Monday morning and Tuesday night, but there is potential to double these amounts on Tuesday.  Stay tuned for more details.

MONDAY:  Overcast, freezing level starting at valley bottom rising to 1000m in the afternoon, moderate to strong southwest wind, 2 to 15cm of snow possible.   

TUESDAY:  Overcast, freezing level near valley bottom, light variable wind, 5 to 20cm of snow possible.                                                                                                          

WEDNESDAY:  Overcast with some clearing in the afternoon, freezing level at valley bottom, light variable wind, 1 to 5cm of snow possible. 

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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