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Archived

Avalanche Forecast

Nov 29th, 2012–Nov 30th, 2012
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
4: High
The avalanche danger rating in the alpine will be high
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: South Columbia.

Confidence

Fair - Intensity of incoming weather is uncertain for the entire period

Weather Forecast

Friday: Moderate snowfall / Moderate southwest winds / Freezing level at 1500mSaturday: Heavy snowfall / Moderate southwest winds / Freezing level at 1400mSunday: Light snowfall / Light southerly winds / Freezing level at 1100m

Avalanche Summary

No recent avalanche activity to report. We welcome all field observations at [email protected].

Snowpack Summary

Up to 10cm of new snow fell on Wednesday night with light to locally moderate south/southwesterly winds. Forecast wind and snow will add some punch to this developing wind/storm slab which sits over a variety of surfaces that may include surface hoar, a sun crust on steep solar aspects, and well settled storm snow from last week. Deeper in the snowpack you might find a thin, spotty surface hoar layer between 50 and 85 cm down. As well, the early November rain crust now sits over 100cm down in most locations (at treeline and above) and may exist in combination with facets. These layers seem to have been unreactive in recent days, but may have the potential to 'wake-up' with additional loading.The snowpack depth in the alpine ranges from 130-225 cm. Treeline near 150 cm.

Avalanche Problems

Storm Slabs

Snow and wind forecast for the next few days will add to the size and reactivity of a developing wind/storm slab that overrides a variety of potentially weak surfaces.
Use extra caution during periods of heavy loading from new snow, and wind.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1 - 4

Persistent Slabs

Although the likelihood of a release is low, the consequences of a persistent slab avalanche could be significant. These layers may wake-up with additional loading.
Choose well supported terrain without convexities.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 5