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Archived

Avalanche Forecast

Apr 20th, 2013–Apr 21st, 2013
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
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Cariboos.

The Public Avalanche Forecasts and Danger Ratings will come to an end on Tuesday. General spring messaging will be found under the Forecast Details tab.

Confidence

Fair - Due to limited field observations

Weather Forecast

The Interior will remain under a cool, dry North-West flow through Tuesday. A slow warming trend will persist until the end of next week.Sunday: Scattered-broken cloud cover, allowing some sunshine through.  Ridgetop winds will blow light from the North. Freezing levels 900 m and falling to valley bottom overnight.Monday/Tuesday: Mostly clear, sunny skies. Ridgetop winds will blow light from the West. Freezing levels 1400 m in the afternoon and falling to 1000 m overnight.

Avalanche Summary

On Friday, numerous loose wet size 1 avalanches occurred. Additionally, a skier triggered size 1.5 slab avalanche released from an East aspect at 2250 m. The crown depth was 25 cm, width was 30 m and running 40 m in length.

Snowpack Summary

Up to 15 cm of new snow sits on melt-freeze crusts (solar aspects) and smaller surface hoar crystals on Northerly aspects. Touchy wind slabs have built on lee slopes and behind terrain features and cornices are huge and remain a concern, threatening slopes below.Buried 60-100 cm down, exists an interface of crusts and buried surface hoar. This is mainly found at upper elevations on all aspects. It seems to be slowly gaining strength, yet this interface has recently become reactive in regions further south. I would remain suspicious, especially of large, steep high-alpine slopes. Dig down, and test layer of concern.

Avalanche Problems

Wind Slabs

New snow and moderate winds have built wind slabs on lee slopes and behind terrain features. Large, looming cornices exist on ridgelines and pose a threat to slopes below. Keep your distance from them.
Be cautious as you transition into wind affected terrain.>Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.>

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 4

Persistent Slabs

A weak interface is buried about a metre down. A smaller avalanche stepping down, cornice fall, the weight under a snowmobile, or the weight of a person from a thin-spot trigger point could trigger a large and destructive avalanche.
Be aware of thin areas that may propagate to deeper instabilites.>Dig down to find and test weak layers before committing to a line.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 6