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Archived

Avalanche Forecast

Nov 21st, 2016–Nov 22nd, 2016
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Glacier.

Large Areas of Glacier National Park Are CLOSED For Avalanche Control Using EXPLOSIVES. For access information visit the Rogers Pass Discovery CentreToday is the first of the Winter Permit System (click here for more information)

Weather Forecast

2 mm of precip is expected throughout today as a weak low pressure system tracks inland and winds are forecast to 30 kph at ridgetop from the South.  Warmer air associated with the incoming weather system will raise freezing levels to 1700m this afternoon. Light snow will continue through next week.

Snowpack Summary

Increasing winds and regular daily snowfall have built a storm slab in the alpine and windslab at ridgetop. The November 13 crust is buried 40-70cm and this interface is an important layer to watch as its starting to produce sudden shears in tests. Below 1900m snow depths are less than 60cm with many early season hazards.

Avalanche Summary

3 size 2.0 natural avalanches were observed from steep terrain on Mt MacDonald in the highway corridor over the last few days. A public MIN report from Saturday described a cornice triggered sz 2 running 800m from a SW asp on Video pk. Heavy sluffing was also observed on steep north facing terrain.

Confidence

Avalanche Problems

Wind Slabs

Moderate South East winds have blown around the new snow at ridge top loading lee features and building new touchy soft cornices
Use caution in lee areas. Recent wind loading has created wind slabs.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Storm Slabs

Although the surface snow remains light and powdery in most places, daily new snow & warmer temps are promoting slab formation above the Nov 13 crust. Stability test have shown planar failures on this layer that indicate it is becoming more reactive
Use caution in lee areas in the alpine. Wind loading has created deeper pockets of slabs.Be cautious of sluffing in steep terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3