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Avalanche Forecast

Jan 8th, 2013–Jan 9th, 2013
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
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: Sea To Sky.

Confidence

Good

Weather Forecast

Wednesday: Snow flurries with another 5-10cm possible, moderate southwesterly winds becoming northwesterlies in the afternoon, and freezing levels are expected to rise as high as 1500m on Tuesday night but drop back down to 700m by midday Wednesday. Thursday and Friday: Mainly sunny and dry with light northerly winds and freezing levels near sea level.

Avalanche Summary

Relatively small soft slab and dry loose avalanches were easily triggered on on Tuesday, but with further loading by new snow, the potential for larger, more destructive storm slab avalanches is expected to increase. At lower elevations near the coast widespread natural moist loose avalanches up to Size 2 were also reported.

Snowpack Summary

20-30cm of storm snow since Friday is bonding poorly to the previous snow surface, which includes large surface hoar, facets, old hard wind slabs, or a sun crust. As more snow continues to load this weakness, and the slab settles and becomes cohesive, it is expected to become even more touchy with the potential for larger avalanches. No significant weaknesses have been reported recently below this in the mid snowpack layers. Near the base of the snowpack, a crust/facet layer exists, which is now unlikely to be triggered, except perhaps by heavy triggers in steep, shallow, rocky terrain where more facetting has taken place.

Avalanche Problems

Storm Slabs

The new snow has set up touchy slab conditions in many areas, especially where strong southerly winds have created thicker and denser deposits.
Be cautious as you transition into wind affected terrain.>The new snow will require several days to settle and stabilize.>Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.>Choose conservative lines and watch for clues of instability.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 5