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Archived

Avalanche Forecast

Mar 28th, 2017–Mar 29th, 2017
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Watch for transitions in the snow and stay aware of changes in the weather. Snow and wind can quickly form touchy windslabs. Mild temperatures will stiffen the snow into a slab and weaken bonds over crusts, causing a higher chance of wide propagation 

Weather Forecast

Today, moderate SW winds accompanied by moderate snowfall will be loading lee slopes and forming windslabs in exposed treeline and alpine areas. Temperatures below treeline will be mild and new snow overlying Sunday's newly formed crust may have a poor bond. 30 cm of new snow is forecast by Thursday morning. Expect unsettled weather until Friday.

Snowpack Summary

Spring crusts are stacking up: March 27 CR down 10cm, March 19 CR down 35cm, March 16 CR down 60cm. These layers are potential sliding surfaces as loose wet or moist slab avalanches. Windslabs on lee slopes will be a major concern today, watch for cracking/shearing. PWL's are Feb 19 CR down 150cm, Nov facets/crust are at the base of the snowpack

Avalanche Summary

Yesterday, several loose moist avalanches to size 1.5 - 2.0 were observed later in the afternoon on Avalanche Crest. Activity is expected to pick up with last nights 5-10cm of new snow adding to 30cm of storm snow and forecast moderate to strong south winds. Expect loose dry, and lee slope windslabs avalanching  out of steep alpine terrain.

Confidence

Avalanche Problems

Wind Slabs

Use caution in lee areas. Recent wind loading have created wind slabs.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Loose Wet

Warming temperatures can cause new snow over crusts to quickly become touchy and slide easily as loose wet or moist slab avalanches.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Likely

Expected Size: 1 - 2

Cornices

Cornices are very large right now and can fail unpredictably - if this happens persistent weak layers deep in the snowpack can be triggered, resulting in very large avalanches.
Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 4