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Avalanche Forecast - South Columbia    


Date Issued   Sunday, 20 April 2014 3:55 PM      Valid Until    Monday, 21 April 2014 9:00 PM

At this time of year resist the urge to rely on danger ratings alone. Daytime warming or periods of sun can rapidly elevated danger ratings above what is forecast.

Check out this blog post for more info on how to manage risk during the spring.

Danger Rating: Monday 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.
Tuesday Wednesday
Alpine 3 - Considerable 3 - Considerable
Treeline 2 - Moderate 2 - Moderate
Below Treeline 2 - Moderate 2 - Moderate
Confidence: Fair - Due to the number of field observations
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.

Loose Wet
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?

Expect to see an increase in avalanche activity if the snow becomes moist with daytime warming or the sun hits cold snow for the first time.

Travel and Terrain Advice
  • Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet.
Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?

Moderate west winds have cause widespread wind effect in the alpine. Reactive wind slabs may be found in lee of ridges and ribs.

Travel and Terrain Advice
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Cornices become weak with daytime heating.

Prepared by esharp