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Archived

Avalanche Forecast

Nov 27th, 2018–Nov 28th, 2018
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

30cm of storm snow along with warming temperatures and moderate SW wind is leading to an increasing avalanche danger.

Weather Forecast

SW moderate winds and another 6cm of snow are forecast for today accompanied by freezing level edging up to 1700m. Freezing levels should drop to 1400m overnight and remain there through Wednesday. Moderate ridgeline winds from the SW are forecast to continue right through to Wednesday evening.

Snowpack Summary

Light SW wind and upwards of 30cm of snow covers surface hoar or suncrust at treeline & sheltered alpine locations. Expect soft storm slab formation to be widespread. A 20cm crust left over from late October sits on the ground and may be poorly bonded on some high elevation north aspects. Snow depth is 60cm at 1300m and 150cm at 2000m.

Avalanche Summary

No new avalanche activity observed or reported yesterday, likely partly due to poor visibility.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

30cm+ of low density snow overlies a widespread surface hoar layer and a thin crust on isolated steep solar aspects. Watch for a trend toward storm slab as this surface layer consolidates with warm temperatures.
The new snow will require several days to settle and stabilize.Watch for whumpfing, hollow sounds, and shooting cracks.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2