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Avalanche Forecast

Mar 9th, 2014–Mar 10th, 2014
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
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Northwest Coastal.

Confidence

Fair - Forecast snowfall amounts are uncertain on Tuesday

Weather Forecast

Monday: Cloudy with flurries in the morning followed by sunny breaks. The freezing level is around 800-1000 m. Winds are moderate from the W-SW. Tuesday: Periods of snow, heavy at times 20-40 cm (higher amounts are for Bear Pass). The freezing level is around 1200-1400 m and winds increase to strong from the SW. Wednesday: Periods of snow. The freezing level is around 1000 m. Winds remain strong from the SW.

Avalanche Summary

Numerous natural loose wet avalanches up to size 2 were reported below treeline from warming temperatures and rain. There were also reports of many size 2-3 slab avalanches from higher elevations on a variety of aspects. Most of these seemed to release within the recent storm snow or on the previous snow surface buried on March 7.

Snowpack Summary

The snow keeps piling up! Around 50-80 cm of recent storm snow now sits on previous snow surface of hard wind slabs or scoured slopes in exposed terrain and a thick layer of faceted snow on sheltered shady slopes, maybe with some surface hoar mixed in, and a sun crust on steep solar aspects. Expect moist or wet snow below 1000 m, possibly with one or two new crusts near the surface. The mid February weak layer of surface hoar or a crust/facet combo is buried 90-150 cm deep. This layer continues to react in snowpack tests, primarily on sheltered north aspects at or below treeline. Basal facets and/or depth hoar remain a concern in shallow snowpack areas in the northern part of the region.

Avalanche Problems

Storm Slabs

Weaknesses may exist within the new storm snow (up to 80 cm), or at the interface between the storm snow and old snow surface, which was a mix of sugary facets, a melt-freeze crust, or old hard wind slabs. 
Use conservative route selection, stick to moderate angled terrain with low consequence.>Be alert to conditions that change with elevation and use caution in wind loaded northwest to east facing terrain. >

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 6

Persistent Slabs

There is potential for heavy loads like a cornice fall or a storm slab avalanche to step down and trigger a deeper persistent weak layer, down over a metre in most places.
Avoid lingering in runout zones.>Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.>

Aspects: North, North East, East.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 3 - 7