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Archived

Avalanche Forecast

Jan 31st, 2015–Feb 1st, 2015
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
1: Low
The avalanche danger rating below treeline will be low
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

Regions: Glacier.

Keep your eyes out for wind affected areas where the new snow has formed wind slab.

Weather Forecast

Today will be dry with a mix of sun and clouds. Tomorrow we will start to feel the effects of a deep low in the Gulf of Alaska with snowfall beginning Sunday morning and up to 30cm of snow expected by Tuesday. Freezing levels should stay around 1000m with moderate to strong SW ridgetop winds. A short lived high pressure will build again on Tuesday.

Snowpack Summary

Up to 20 cm of snow with mostly light south winds overnight has buried the January 30 crust which can be found up to 2400m. Surface hoar was found on the crust and just below it the snow has become weak and faceted. The Jan15 surface hoar layer down 60-90cm and is more stubborn to trigger. The Dec 17 surface hoar/ crust complex is down 130-180cm.

Avalanche Summary

No avalanches were observed yesterday, but small cycles have been occurring on steep S-SW aspects around exposed rocks and cliff areas during warm sunny periods in the past few days.

Confidence

Forecast snowfall amounts are uncertain on Saturday

Avalanche Problems

Persistent Slabs

Jan 15 layer is buried 60-100cm deep. This layer remains a concern due to surface hoar crystals. As snow continues to settle, this layer will require larger triggers to initiate. This layer could be triggered by heavy loads or from shallow areas.
Avoid convexities or areas with a thin or variable snowpack.Pay attention to overhead hazards like cornices.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3

Loose Dry

Expect widespread sluffing on the crust. Watch for pockets of slab over this layer especially from last nights SW winds .
Be cautious of sluffing in steep terrain.Avoid freshly wind loaded features.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2