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Avalanche Forecast

Archived

Jan 6th, 2015–Jan 7th, 2015

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

Regions

Little Yoho.

Avalanche control is planned for Wednesday, please avoid skiing and climbing on Mt. Field, Mt. Stephen, Mt. Bosworth, Mt. Whymper and the Simpson paths (previously known as the Vermillion paths).

Weather Forecast

NW flow aloft continues, and this moist air is colliding with cold arctic air somewhere over the Rockies. The majority of the precipitation from this storm is now over with only trace amounts expected overnight and tomorrow, but strong upper level winds and warming temperatures are expected for Wednesday. Cooling arrives on Thursday.

Snowpack Summary

15 cm over the past 24 hr adds to the total of close to 40 cm of storm snow since Jan 2. The Dec 18 layer of surface hoar and crust was observed today down 50 cm (at treeline) and is producing a lot of whumphing and cracking.  Generally the surface snow remains very unconsolidated, but this will change in alpine areas on Wed with increasing winds.

Avalanche Summary

No new avalanches were observed or reported in this region today, but visibility was terrible.

Confidence

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.