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Avalanche Forecast - Sea-to-Sky    


Date Issued   Saturday, 19 April 2014 4:27 PM      Valid Until    Sunday, 20 April 2014 9:00 PM

Danger Rating: Sunday Alpine Treeline Below Treeline
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
1 - Low Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
Monday Tuesday
Alpine 3 - Considerable 3 - Considerable
Treeline 2 - Moderate 2 - Moderate
Below Treeline 1 - Low 1 - Low
Confidence: Fair - Timing, track, or intensity of incoming weather system is uncertain
Learn more about danger ratings
Low Moderate Considerable High Extreme

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.

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.

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.

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.

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

Storm Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?

Storm slabs have formed at higher elevations where the snow remains dry. Stiffer wind slabs have formed in leeward alpine terrain features from moderate-strong S through W winds.

Travel and Terrain Advice
  • Avoid freshly wind loaded features.
  • The new snow will require several days to settle and stabilize.
Loose Wet
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?

Rain at lower elevations will saturate and destabilize the upper snowpack. Loose sluffing from steep terrain features is possible, especially from human-triggering.

Travel and Terrain Advice
  • Be cautious of sluffing in steep terrain.
  • Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.

Prepared by rbuhler