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Archived

Avalanche Forecast

Feb 1st, 2013–Feb 2nd, 2013
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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.

It is a good day to make conservative terrain choices. Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run outs.

Weather Forecast

The park will be effected by high pressure for the next three days.  Temperature will rise over this period and light amounts of precipitation are possible.  Freezing levels are forecast to rise to 1300 m today dropping to the surface tonight and 2000 m on Saturday.  A northwesterly flow continues with ridge top winds in the light, NW range. 

Snowpack Summary

Up to 55 cm of settled storm snow has accumulated since Jan 26 near the west boundary of the park. The amounts are less moving east through the park.  Heavy warmer, wind effected snow lies over colder, lower density snow.  Recent strong S winds have loaded northerly lee features at treeline and in the alpine.

Avalanche Summary

We observed one natural avalanche, sz. 2.5 running to end path along the highway corridor yesterday.  Artillery control produced several avalanches running far with large dust component west of the summit. For all of these observation visibility was poor. A small natural avalanche cycle was triggered by strong winds on the 30th. 

Confidence

Freezing levels are uncertain

Avalanche Problems

Storm Slabs

Skier triggerable slabs exist throughout the park. Recent strong southerly winds have loaded northerly aspects. Avoid lee and cross-loaded terrain near ridges where the wind has deposited firm snow.  Watch for shooting cracks as a sign of soft slabs.
Ride slopes one at a time and spot for your partners from safe locations.Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3