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Archived

Avalanche Forecast

Apr 29th, 2014–Apr 30th, 2014
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Kananaskis.

A major warming on Wed and Thurs will likely trigger a significant spring avalanche cycle. Avoid avalanche terrain.

Confidence

Good

Weather Forecast

Warm and mostly sunny conditions are expected for the next two days, before another wave of precipitation arrive on Friday. Freezing levels will reach 3300m on Wednesday and 3600m on Thursday with little to no overnight recovery.

Avalanche Summary

Several loose wet slides up to size 2.0 were triggered today by solar radiation on East, South and West aspects.

Snowpack Summary

Moist snow is found on all aspects and at all elevations except true North aspects above 2400m. The snowpack is turning isothermal at lower elevations. Isolated thin wind slabs are found at ridge crest in immediate lee slopes, but these have been unreactive to ski cutting. The basal facets and deoth hoar are reactive during times of intense solar radiation and/or warm daytime temperatures. Some recent avalanches have failed on the ground. Where cornices exist they are large and sagging.

Avalanche Problems

Deep Persistent Slabs

The basal facets are producing large slab avalanches that are failing on the basal facets.
Ski crampons make travel easier and safer on frozen surface conditions>Be aware of thin areas that may propogate to deeper instabilites.>Pay attention to overhead hazards like cornices.>Make your travel plans to take advantage of overnight freezing.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 3 - 6

Loose Wet

High freezing levels over the next two days will lead to widespread wet avalanches, especially on solar aspects. Avoid avalanche terrain when the snowpack is moist or wet, and be very aware of overhead hazard.
Start and finish early before the surface crusts melt.>Pay attention to overhead hazards like cornices.>

Aspects: North, North East, East, South East, South.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 4