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Avalanche Forecast

Archived

Dec 28th, 2018–Dec 29th, 2018

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Northwest Inland.

Substantial snowfall with strong and wind expected. The new snow will need time to stabilize and bond.

Confidence

Low - Intensity of incoming weather systems is uncertain

Weather Forecast

FRIDAY NIGHT: Snow, 15-25 cm accumulation. Moderate to strong southwest wind. Freezing level 500 m.SATURDAY: Flurries, 5-20 cm accumulation. Strong west-northwest wind with extreme gusts. Freezing level 500 m.SUNDAY: Cloudy with isolated flurries, trace accumulation. Light to moderate west wind. Freezing level 500m.MONDAY: Flurries, 5-10 cm accumulation. Moderate to strong west wind. Freezing level below 500 m.

Avalanche Summary

On Thursday, an old natural avalanche was reported near the Hankin Hut. This avalanche occurred on a steep and rocky north aspect and likely failed last weekend as the crown had been blown in. Last Monday, wind-loaded pockets were reactive to skier traffic, including 2 very small unsupported pockets remotely triggered (from a distance) by skiers. Information from this region is limited. Tell us what you see by posting to the Mountain Information Network! (MIN)

Snowpack Summary

Snow starting early Friday morning deposited 5-15 cm snow around the region by Friday evening.Under the new snow, 20-30 cm of recent snow was redistributed by wind and formed slabs in the alpine and treeline. This adds to the snowfall received through December. In total, 50-100 cm covers a weak layer of surface hoar (feathery crystals) and facets (sugary snow) that formed during the dry spell in early December. Information about about how well the December snow is bonding to this layer is limited in this region. Deeper in the snowpack, there are several crusts including an early season crust with facets near the bottom of the snowpack.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.