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Avalanche Forecast

Archived

Mar 21st, 2021–Mar 22nd, 2021

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 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, human triggered possible.

Regions

Glacier.

Winter has returned up high.

While it doesn't feel like we've received much snow in the parking lot, a conservative mid-winter storm mindset will be required to manage the hazard as you gain elevation.

Weather Forecast

A cold front will bring snow to Glacier Park today and tonight.  A transient upper ridge will bring drier conditions by Tuesday

Today:  Cloudy with flurries, 4cm. Fzl 1400m. Wind SW 20 gusting to 45 km/h

Tonight: Flurries, 7cm. Fzl 800m. Wind SW 15 gusts to 50 km/h

Monday: Cloudy with sunny periods and isolated flurries. Fzl 1200m. Wind NW 15-30 km/h

Snowpack Summary

25-35 cm of new snow is covering a melt-freeze crust on solar aspects, surface hoar on dry settled snow on polar aspects, and a moist upper snowpack at lower elevations. Cornices are large and fragile, be sure to maintain good travel habits and give them a wide berth.

Avalanche Summary

A few large slab avalanches occurred from the steep north paths off Mt. Macdonald yesterday. The glide crack on lower Avalanche Crest 4 also released. Several glide slab avalanches were observed below treeline in the highway corridor on Friday during the strong solar input.

Confidence

Due to the number of field observations

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.