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Avalanche Forecast - Sea-to-Sky    


Date Issued   Tuesday, 22 April 2014 4:05 PM      Valid Until    Wednesday, 23 April 2014 9:00 PM

Avalanche danger can rise quickly with afternoon warming and solar radiation. Be aware of changing conditions and overhead hazards.

For more insight into spring danger ratings, check out this blog post.

Danger Rating: Wednesday Alpine Treeline Below Treeline
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
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.
Thursday Friday
Alpine 2 - Moderate 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.

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

Wind slabs from the weekend storm may still be sensitive to human-triggering.  These formed in leeward alpine features from strong S-SW winds.

Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Use caution in lee areas in the alpine. Recent wind loading have created wind slabs.
Loose Wet
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?

Loose wet activity can be expected from steep features during periods of solar warming or rain.  Isolated wet slabs may be possible under the same conditions where the recent storm snow is poorly bonded to the underlying crust.

Travel and Terrain Advice
  • Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.
  • Be cautious of sluffing in steep terrain.
Cornices
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?

Large cornices may become reactive during periods of sun and warming.  Cornice falls have the potential to trigger deep instabilities which could result in large, destructive avalanches.

Travel and Terrain Advice
  • Give cornices a wide berth when travelling on or below ridges.
  • Cornices become weak with daytime heating, so travel early on exposed slopes.

Prepared by rbuhler