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Archived

Avalanche Forecast

Jan 23rd, 2013–Jan 24th, 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
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
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.

Danger levels will rise today as we finally start seeing new snow accumulate.  Keep your trip plan flexible and incorporate all evidence of unstable snow (avalanche activity, cracking, whumphing, etc.) in your decision making.

Weather Forecast

5 to 15cm on snow are forecast for the park this afternoon and evening as a fast moving westerly flow brings seasonal temperatures and southwest ridge top winds 30 to 50km/h.  Another system is expected to bring more snow overnight Thursday into Friday.  Exact timing and amounts are uncertain.  Temperatures will remain seasonal (-10 to -5)

Snowpack Summary

New snow overnight has covered a variety of surfaces including, small surface hoar and sun crust on steep south through west slopes. Widespread wind effect is present in open areas at treeline and in the alpine, though stubborn to rider triggering.Jan 4th SH/CR down 45-65 cm reacting in stab tests (moderate to hard range) yesterday at TL, SE asp.

Avalanche Summary

We have observed few natural avalanches in the park recently.  These avalanches have been small and triggered by wind deposited snow or solar radiation inputs.

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

Avalanche Problems

Wind Slabs

Evidence of wind slabs still lingers in the alpine. Caution at ridge crests and on cross loaded features.
Be cautious as you transition into wind affected terrain.Minimize exposure during periods of heavy loading from new snow, wind.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Persistent Slabs

A weak layer down around 50 cm remains a concern. It has been most reactive to rider triggering on steep slopes where a sun crust is present.
Dig down to find and test weak layers before committing to a line.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3