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Archived

Avalanche Forecast

Apr 20th, 2017–Apr 21st, 2017
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
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
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
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: Glacier.

Spring like conditions below treeline need to be factored into your exit plan from the alpine.  Plan to be back to trailheads before the lower elevation snowpack becomes weakened by daytime warming.

Weather Forecast

Cloudy with isolated flurries, light west winds and an alpine temperature of -1C.  Friday a mix of sun and cloud, light to moderate NW wind and an alpine temperature of 0C.  Strong solar input is expected for Friday.

Snowpack Summary

No overnight freeze leaves below tree line lower elevations weak and isothermal. At higher elevations S through SW winds have redistributed Easter storm snow onto alpine lee features. Cornices are huge and ripe for failure. These large triggers may wake deep persistent weak layers resulting in large avalanches.

Avalanche Summary

Four new slides to size 2 in the highway corridor yesterday all out of solar aspects.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

Recent storm snow has been redistributed by moderate S-SW winds forming windslab in the immediate lee of ridges and crosswinded features. These slabs will be forming over sun crust on solar aspects and temperature crust on others.
Use caution in lee areas. Recent wind loading have created wind slabs.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Loose Wet

Limited overnight freeze and freezing levels rising to 1900m today will result in a weak wet snowpack below treeline. Expect surface sluffing this afternoon.
If triggered the loose wet sluffs may step down to deeper layers resulting in large avalanches.Use extra caution on slopes if the snow is moist or wet.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Cornices

Cornices are extra large. The potential for triggering increases with daytime warming and prolonged solar radiation.
Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.Pay attention to overhead hazards like cornices which could trigger slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 4