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Archived

Avalanche Forecast

Nov 22nd, 2013–Nov 23rd, 2013
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
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
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: Kootenay Boundary.

This forecast is based on limited field data.  Feel free to send any observations to [email protected].

Confidence

Poor - Due to the number and quality of field observations on Friday

Weather Forecast

A high pressure system is forecast to persist through the weekend bringing dry conditions. A weak inversion could cause temperatures to approach zero degrees in the high alpine.Saturday: Light winds from the NW. Clear skies. High of -4C at 1500mSunday: Light winds from the NW. Becoming cloudy. High of -4C at 1500mMonday: Light winds from the NW. Cloudy skies. High of -3C at 1500m

Avalanche Summary

Explosive avalanche control earlier on Tuesday, November 19th produced storm snow slab avalanches up to size 2 in the Southern Selkirks.

Snowpack Summary

Reports from Kootenay Pass suggest that about 100cm of snow can be found at treeline in the area. Observations are limited and this amount may vary dramatically across the region.The storm earlier this week deposited 30cm of new snow in the alpine. Roughly 60 to 70cm of snow is now sitting on a widespread crust from early October.

Avalanche Problems

Wind Slabs

Expect wind slabs to be lingering on lee features in the alpine. Triggering a wind loaded feature might be enough load to cause a large avalanche on the deeper rain crust
Be cautious as you transition into wind affected terrain.>Be careful with wind loaded pockets >

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 4

Persistent Slabs

Reports indicate that there is a crust down 70cm at and above tree line. Where the crust is smooth or is overlayed by facets this layer might be able to produce avalanche up to size 2 to 3.
Carefully evaluate and use caution around thin snowpack areas.>Caution around convexities or areas with a thin or variable snowpack.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 3 - 5