Avalanche Forecast

Sea To Sky

Date issued

Jan 15, 2018 - 4:43 PM

Valid until

Jan 16, 2018 - 2:00 PM

Prepared by

jmcbride

Heavy snow, rain and strong winds are expected for the forecast period. Expect touchy storm slabs at elevations that receive snow. At lower elevations watch for wet snow avalanches in steep, rain-soaked terrain.

Regular season
Monday - January 15, 2018
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

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.

Tuesday - January 16, 2018
Alpine

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.

Treeline

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.

Below Treeline

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.

Wednesday - January 17, 2018
Alpine

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.

Treeline

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.

Below Treeline

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.

Avalanche Problem 1: Storm Slabs

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

Loading from new snow and strong winds will create widespread storm slabs. Loose wet and wet slab avalanches will be the concern where rain has soaked the snow. A release near the surface may still have the potential to step down to a deeper layer.

Travel and Terrain Advice
  • Use extra caution on slopes if the snow is moist or wet.
  • If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
  • Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.

Avalanche Summary

Warm alpine temperatures on Sunday produced numerous naturally triggered loose wet and wet slab avalanches mostly in the size 1-1.5 range, and a few up to size 2 on solar aspects.

Snowpack Summary

Warm temperatures at all elevations are consolidating the snowpack and making the surface moist on all but north aspects. At elevations above approximately 1500 m precipitation from the previous storm fell as snow, while below that elevation, rain fell.  Below the new storm snow, a thick crust that was buried on January 6th is now buried 30-50 cm below the surface. This crust exists up to about 2000m elevation.

Beneath the January 6 crust, the lower snowpack is generally strong and well settled.

Weather Forecast

MONDAY NIGHT: Rain changing to snow. Precipitation 4-8 mm. Ridge wind strong, south. Temperature +1. Freezing level lowering to 1500m

TUESDAY: Snow. Accumulation 10-20 cm. Ridge wind strong, southwest. Temperature -2. Freezing level 1200 m.

WEDNESDAY: Heavy snow. Accumulation 30-50 cm. Ridge wind strong, south. Temperature -1. Freezing level 1500 m.

THURSDAY: Snow. Accumulation 25-40. Ridge wind strong, southwest. Temperature -3. Freezing level 1200 m.

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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