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Archived

Avalanche Forecast

Feb 2nd, 2015–Feb 3rd, 2015
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
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Adjust your backcountry objectives to be more conservative as a new weak layer is buried deeper.

Weather Forecast

Continued snowfall is expected for the central Interior into mid-day Tuesday with amounts ranging between 10-20cm. Freezing levels are to remain steady at ~1000m. Moderate to strong higher elevation winds will peak tonight from the southwest and taper off through tomorrow. A weak ridge of high pressure will break this system up on Wednesday.

Snowpack Summary

The Jan 30 surface hoar/crust layer is down 30-35cm below recent storm snow. The crust reaches to 2200m above which it becomes firm wind pressed snow. The Jan 15 surface hoar layer is down 60-100cm. The Dec 17 surface hoar/ crust complex is down 140-190cm.

Avalanche Summary

No new avalanches observed yesterday.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

Soft slabs will be more prevalent today due to steadier overnight winds.  ~35cm sits on a firm, smooth layer providing a good surface for avalanches to slide on. Exercise extra caution near ridge crests or cross loaded terrain features.
Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

The mid January surface hoar layer is buried 60-100cm deep. Getting this layer to fail will be difficult but triggering it from shallow areas or from heavy loads such as a cornice fall remains possible.
Avoid convexities or areas with a thin or variable snowpack.Pay attention to overhead hazards like cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3