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Avalanche Forecast

Jan 1st, 2018–Jan 2nd, 2018
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Northwest Inland.

Pockets of lingering wind slab are still proving reactive to human traffic at higher elevations.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Isolated flurries with a mild inversion for the week as temperatures gradually warm up. Some snow on Thursday & Friday.TUESDAY: Cloudy with some flurries (2-5 cm possible). Ridge wind moderate south west. Temperature -3. Freezing level 500m with an AFL from 1200m to 1700m. WEDNESDAY: Cloudy with isolated flurries. Ridge wind moderate from the south. Temperature -2. Freezing level 500m with an AFL from 1100m to 1900m. THURSDAY: Snow. Accumulation 5-10 cm. Ridge wind strong from the south. Temperature -2. Freezing level 600 m.

Avalanche Summary

Isolated pockets of wind slab (to Size 2) have proven reactive to intentional human triggering, including southerly aspects around 1700m. Although the wind slabs were relatively thin (10 cm thick on average), they did run far.

Snowpack Summary

Surface snow has been affected by winds from a variety of directions. The degree of wind effect varies throughout the region, with the most dramatic winds associated with outflow conditions in western parts of the region near coastal inlets. Sheltered areas may still have 10-30 cm of powder from previous storms. A variable weak layer that formed in mid-December can be found roughly 20 cm below the surface. This mid-December layer is comprised of crusts on solar aspects and feathery surface hoar in sheltered locations.The lower snowpack is generally well settled with two prominent crusts. The late-November crust can be found 30-50 cm below the surface and the October crust is near the base of the snowpack.For an update on recent conditions check out the Mountain Information Network (MIN) report here. And please submit your own observations to the MIN!

Avalanche Problems

Wind Slabs

Lingering pockets of wind slab may exist on a range of aspects at higher elevations as wind directions have varied over the past week.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Watch for stiff or hollow feeling snow, and shooting cracks.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2