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Avalanche Forecast

Archived

Jan 23rd, 2020–Jan 24th, 2020

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

Regions

Glacier.

The upper snowpack is in a period of change as temperatures rise, and more snow falls. It is a  good day for conservative decision making, and always ski/ride your line one at a time!

Weather Forecast

A Pacific frontal system moves over Rogers Pass today, bringing with it: rising temperatures, new snow, and possibly wind. There is also a chance that an above freezing layer (AFL), could bring rain to mid elevations and freezing rain or ice pellets to valley bottoms. Today we are expecting Flurries 9cm of new snow, FL rising to 1500m and mod wind.

Snowpack Summary

15-25cm of settling storm snow lies on previous wind effect and small facets from last weeks cold. Variable slabs can be found in the alpine and at Treeline at ridge-tops and immediate lee areas. The mid-lower snowpack is generally well settled and strong. The Dec 27th surface hoar/crust down 100cm has not been reactive.

Avalanche Summary

Numerous avalanches were observed in the Highway Corridor yesterday up to size 2.5, including a skier accidental size 2 on MacDonald West Shoulder # 4(see photo here). Several MINs were reported as well; A size 1 storm slab on Video Peak, another size 1 in the grizzly area, and a size 1 wind slab also in the Connaught drainage.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.