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Archived

Avalanche Forecast

Jan 21st, 2019–Jan 22nd, 2019
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
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.

This wind slab problem is on the surface and is easy to identify. Shooting cracks, or firmer snow are slab indicators. Dig down and investigate the upper snowpack before committing to your line.

Weather Forecast

Sunny with cloudy periods, no precipitation, light winds from the NW and the freezing level will rise no further than valley bottom. Snow beginning tonight(flurries), 7cm on Tuesday and 13cm on Wednesday. This brief system does not last long, or pack much punch as another ridge of high pressure follows closely behind.

Snowpack Summary

25cm of storm snow overlies a wide variety of surfaces depending on aspect, elevation, and drainage; including but not limited to surface hoar in sheltered locations to unreactive wind slabs in the alpine. The new snow was accompanied by extreme winds on Saturday, forming slabs in specific areas throughout the park.

Avalanche Summary

A size 1 skier accidental and a size 2 skier controlled occurred yesterday. The size 1 was on a east aspect, 40 deg slope at 2450m in Hospital Bowl. The slab was 15-25cm deep, 30m wide and ran for 100m; the size 2 was in the lookout couloirs. Another similar avalanche occurred on Saturday in the Ravens; size 1.5 at 2100m on a SW asp, 35 deg slope.

Confidence

Due to the quality of field observations

Avalanche Problems

Wind Slabs

Over the weekend we received 20cm of new snow accompanied by extreme winds forming wind slabs in specific locations throughout the park. This overlies the Jan 17th SH layer in sheltered areas and old unreactive wind slabs in exposed terrain.
Dig down to find and test weak layers before committing to a line.Use caution in lee areas. Recent wind loading have created wind slabs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2