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Archived

Avalanche Forecast

Feb 3rd, 2015–Feb 4th, 2015
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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.

Weather Forecast

Warming temperatures decreasing winds and continued light snow will add to the surface storm slab through today.  There will be a break in the precipitation Wednesday with Thursday bringing another pulse of Pacific moisture. 

Snowpack Summary

Upwards of 40cm of storm snow sits on top of the Jan 30 surface hoar/crust layer.  Expect to find the Jan 30 crust up to 2200m with firm, wind pressed snow at higher elevations.  Jan 15 surface hoar layer is down 70-110cm and the December 17 is down 140-190 cm. 

Avalanche Summary

Numerous avalanches occurred in the highway corridor in the size 1 to 2 range.  These slides were mainly found in steep gully features.

Confidence

Forecast snowfall amounts are uncertain

Avalanche Problems

Storm Slabs

Storm snow will be redistributed by mod southerly winds on to alpine lee slopes and crossloaded features. This storm snow sits on a firm smooth surface especially below 2200m. Take time to assess the snowpack while approaching wind affected features.
Use caution in lee areas. Recent wind loading have created wind slabs.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

The January 15 surface hoar layer is down 70-110cm.  Large triggers will be required to wake this layer however it remains possible in shallow snowpack areas or from cornice fall.
Pay attention to overhead hazards like cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 3