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Archived

Avalanche Forecast

Nov 26th, 2018–Nov 27th, 2018
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Watch for increasing avalanche danger over the next 48hrs as a warm pulse of Pacific moisture brings upwards of 30cm of forecast snow by Tuesday evening.

Weather Forecast

12cm of snow is on route today accompanied by moderate S'ly wind and a freezing level inching up to 1400m. A more significant pulse of warm Pacific moisture will bring upwards of 25cm by Tuesday evening along with gusty SW winds. Look for an increasing avalanche danger in the next 48hrs.

Snowpack Summary

20cm of low density snow covers surface hoar or suncrust at treeline & sheltered alpine locations. Presently unconsolidated, watch for change in the next 24 hrs toward storm slab. 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

One natural size two avalanche observed off the north face of Mt MacDonald ran to the beginning of the run out. Sluffing from ski-cutting was observed from steep slopes (>35 degrees). These sluffs gathered enough mass to push a person around, though not bury them. Use caution around cliffs and terrain traps where these sluffs could cause problems.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Avalanche Problems

Storm Slabs

20cm+ 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. Soft slabs may exist in isolated wind-affected areas.
Watch for whumpfing, hollow sounds, and shooting cracks.Use caution above cliffs where small avalanches may have severe consequences.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2