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Archived

Avalanche Forecast

Jan 31st, 2019–Feb 1st, 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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Snow is once again in the forecast! Watch for slab development as we head towards a period of natural avalanches in the coming days.

Weather Forecast

A low pressure system is poised to stall over the area for the next 3 days delivering 10cm today, 10cm tonight, 22cm on Friday and 10cm on Sunday. For today, freezing levels climb to 1300m with and alpine high of -4 and SW winds 20km/h. Ridge winds will pick up this afternoon and gust to 50km/h with the arrival of a front.

Snowpack Summary

10cm of new snow overnight with moderate S winds. New snow sits atop hard wind slabs in the alpine and exposed areas at treeline. The January 17 surface hoar is buried 30-50cm and is most reactive between 1400-1900m, and where it overlies a crust on steep solar aspects. A reloaded crust from November has been reactive on steep south aspects.

Avalanche Summary

No new avalanche activity observed in the HWY corridor yesterday. On Tuesday there was a skier accidental size 2.5, on a steep, rocky, unsupported, South facing slope. 2 involved, 1 partial and 1 full burial, see MIN.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Loose Dry

Snow is forecasted for the next several days. Expect new snow to bond poorly causing loose avalanches in steep terrain. This problem will transition into a storm slab as snowfall amounts build up over the next 24hrs. Winds will increase snow loading.
Be cautious of sluffing in steep terrain, particularly where the debris flows into terrain traps.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 1.5

Persistent Slabs

The Jan 17th Surface Hoar layer is now down 30-50cm. This layer exists on all aspects, and is most problematic between 1400-1900m and on steep solar aspects where it overlies a crust.
Use caution on open slopes and convex rolls where buried surface hoar may be preserved.Convex features and steep unsupported slopes will be most prone to triggering.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Possible

Expected Size: 1 - 2