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Archived

Avalanche Forecast

Feb 9th, 2015–Feb 10th, 2015
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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

A little more snow and rain today on top of the significant amounts we've recently received. Loose avalanches may be easily triggered at lower elevations if precipitation continues as rain.

Weather Forecast

One last system will give us some rain/snow into tonight before dissipating tomorrow and allowing for a ridge high pressure to build . Freezing levels are forecast to rise to 1800m with light amounts of precipitation and light winds. Unsettled weather will persist for Tuesday with cloud, slight cooling and flurries before clearing on Wednesday.

Snowpack Summary

5cm of new snow over a varied snowpack depending on elevation. Moist snow in the upper 20cm at 2000m. Moisture content reaches deeper below 1600m. There has been up to 1m of settled storm snow over the Jan 30 layer. This layer formed a crust to 2200m with spotty surface hoar distribution. Jan 15 surface hoar layer is down 100-150cm.

Avalanche Summary

Backcountry users reported hearing avalanches in Connaught yesterday but could not confirm the exact size and location. There is large avalanche debris to the valley bottom in Grizzly slide path in Connaught from the last 48 to 72hrs. Yesterday there were 3 moist natural avalanches, size 2.0 in the highway corridor.

Confidence

Due to the number of field observations

Avalanche Problems

Storm Slabs

With around 1m of settled storm snow over the last week, much of that rain below 1600m, time will be needed for instabilities within it to heal.
The new snow will requires several days to settle and stabilize.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

Persistent weak layers within the top 150cm of the snowpack should not be discounted just yet. Storm slabs avalanches may step down and propagate on these deep instabilities.
If triggered the storm slabs may step down to deeper layers resulting in large avalanches.Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 3 - 4