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Archived

Avalanche Forecast

Nov 19th, 2018–Nov 20th, 2018
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

The Winter Permit System comes into affect tomorrow, Nov 20 2018. Be sure to check Winter Restricted Areas status and acquire the appropriate permit.

Weather Forecast

Mainly cloudy today with short periods of sunshine as the ridge of high pressure prevents any precipitation pushing inland. Winds will be light from the West with an alpine high of 0 as the freezing level rises to 1800m. A weak temperature inversion is forecasted for our area as temps rise above zero today and Tues. Cooler temps and snow on Wed.

Snowpack Summary

Surface hoar growth observed up to 10mm at tree line elevation with the upper snowpack trending towards facetting. A surface hoar / sun crust layer (aspect dependant)  is down 40cm. Pockets of wind slab may exist in the alpine and exposed areas at tree line.  Snow depths vary from 60cm at Rogers Pass, to 150-170cm in alpine areas.

Avalanche Summary

No new avalanches observed or reported in the last 36hrs.

Confidence

Avalanche Problems

Wind Slabs

45cm of storm snow has been redistributed by moderate Southerly winds and rests on buried surface hoar on northerly aspects and a suncrust on solar aspects. Human triggering is possible.
Use caution in lee areas. Recent wind loading have created pockets of wind slabs.

Aspects: North, North East, East, North West.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Deep Persistent Slabs

The late October crust sits near the bottom of the snowpack and has produced sudden planar and sudden collapse results. Assess this layer before committing to a line. At higher elevations a buried facet layer exists from the September snow.
If you are increasing your exposure to avalanche terrain, do it gradually as you gather information.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3