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Archived

Avalanche Forecast

Jan 18th, 2017–Jan 19th, 2017
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
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
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: Glacier.

A heavy storm slab and warm temperatures have elevated the danger ratings for the next couple of days. Natural avalanches should be expected.

Weather Forecast

Flurries are expected today bringing another 10-15cm. Freezing levels will hover around 1400m and winds will be moderate from the SW. Things will dry out after today and freezing levels will drop to valley bottom by Thursday evening.

Snowpack Summary

35 cm of new snow has fallen in the last 48 hrs. Southerly winds to 45 km/hr have likely redistributed this snow at ridgetop. This new snow buries old wind slab in the Alpine and a surface hoar/facet combo at treeline and below. Due to the unusually cold winter overall, the snowpack is quite faceted and weak.

Avalanche Summary

Numerous natural avalanches to size 3.5 have been observed in the last 24 hours, several dusting the highway. Confined gullies have been producing the biggest results, with debris reaching the valley floor.

Confidence

Avalanche Problems

Storm Slabs

35cm of new snow was accompanied by moderate S winds. This has created a new storm slab that is poorly bonded to a weak layer of facets and surface hoar. This slab will be reactive at all elevation bands, especially with the warm temp's today.
Minimize overhead exposure during periods of heavy loading from new snow, wind.The new snow will require several days to settle and stabilize.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 3