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Avalanche Forecast

Archived

Feb 25th, 2020–Feb 26th, 2020

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

Regions

Glacier.

The Avalanche Winter Restricted Area is CLOSED TODAY. Please respect the Winter Permit System, it requires 100% compliance to keep as much terrain open as possible.

Weather Forecast

Today: Sunny with cloudy periods, freezing level rising to 1200m, and light winds. A pacific front will reach the Rogers Pass later this afternoon, and we might receive 5cm by tomorrow morning.

Tomorrow: Flurries continue throughout the day, with only another 5cm of snow, mod southerly wind, and steady freezing levels near 1100m

Snowpack Summary

30+cm of storm snow has now buried the February 22 weak layer. This layer consists of surface hoar (observed up to 2300m) in sheltered areas and a sun crust on solar aspects. Where the new snow has become cohesive, it is reactive to human triggering as a 20-40cm soft slab.

Avalanche Summary

No new avalanches reported from the backcountry yesterday. Only 6 avalanches were observed in the Highway Corridor, 3 size 2s, and 3 size 1.5s. These natural avalanches were from steep unsupported terrain features. On Saturday we had a decent natural cycle to size 3, which were failing on the Feb 22nd surface hoar/ sun crust.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.