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Avalanche Forecast

Archived

Jan 7th, 2021–Jan 8th, 2021

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

Regions

Glacier.

Conservative decision making should still be applied today. Don't let the sunny skies and deep powder lure you into bigger, or steeper terrain features.

Weather Forecast

A ridge of high pressure will stall over Rogers Pass for the next few days bringing mostly dry conditions and light winds.

Today: Mainly sunny, no precipitation, Fl rising to 1000m and light wind.

Friday: Mainly sunny with isolated flurries, light SW winds and a FL of 1200m

Snowpack Summary

Rogers Pass has received approx 90cm of new snow at TL in 2021. This sits on a surface hoar layer, buried Dec 26, which is preserved in sheltered areas at and below treeline. The Dec 13 surface hoar can still be found down 120cm and the Dec 7 crust/facet/surface hoar (aspect/elevation dependent) layer is down 135+cm.

Avalanche Summary

Approx 15 avalanches were obs in the HWY corridor yesterday. Most of the avalanches happened in very steep or extreme alpine terrain, generally size 2-2.3 with one size 3 and one size 3.5. MIN report of storm slabs on Mcgill shoulder to size 2. Audibles were heard off of Mt Bonney, and naturals were also obs off Mt Cheops in Connaught to size 1.5.

Confidence

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.

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.