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Archived

Avalanche Forecast

Mar 8th, 2018–Mar 9th, 2018
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
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
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.

Avoid steep solar aspects if the sun is shinning as this will increase the avalanche danger. Have a dig into the upper snowpack and look for weak layers before committing to the line.

Weather Forecast

Mainly cloudy with isolated flurries for the day with a temperature range of 0 to -9, 10-25km/h southerly winds and a freezing level rising to 1450m. 10-15cm of forecasted snow tonight and into Friday. There will be a clearing trend arriving over weekend and will continue into next week. Clear skies, light winds and no snow is our near future.

Snowpack Summary

Expect to find several crust layers on steep solar aspects in the top 50cm of snow. ~30cm of recent snow overlies previous wind slab in the alpine. The late Feb facet layer is down ~50cm and the mid Jan persistent weak layer is down ~1-2m.  A well settled base contains early season crusts, which are starting to break down in some areas.

Avalanche Summary

A small cycle occurred yesterday on steep solar aspects when the sun was shinning, expect this to be an increasing trend with sun in the forecast.Earlier this week a large cornice failure released a size 3.5 avalanche running to valley bottom. This cornice triggered slide was an anomaly, but a good reminder to stay vigilant in large terrain.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Friday

Avalanche Problems

Storm Slabs

Isolated storm slabs could be found at ridgetop or features exposed to the wind. Solar radiation will trigger loose dry avalanches on steep sunny slopes and cliffs. These "sluffs" could trigger a soft slab or step down to a persistent weak layer.
Use caution in steeper terrain. Avoid unsupported features on the landscape.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

Several sun crusts are buried within the top 50 cms on steep solar aspects. These layers have the potential for human triggering, dig down and assess the snowpack before committing to the line.
Carefully evaluate terrain features by digging and testing on adjacent, safe slopes. Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5