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Avalanche Forecast

Archived

Apr 3rd, 2021–Apr 4th, 2021

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

Regions

Glacier.

A wind ravaged snow surface may still hold pockets of reactive slab. Be aware of new slabs building and cornices becoming overloaded if the forecast storm comes in early

Weather Forecast

A cold front is due to pass through Saturday night

Sat: trace snow with light SW wind gusting to 50. Freezing level 1900m. High -2

Sat night: 15cm snow with moderate SW wind gusting to 65. Freezing level 1000m

Sun: No precipitation, light W wind. Freezing level 1400m. High -7

Mon: No precipitation, light W wind. Freezing level 1700m. High -5

Snowpack Summary

Up to a meter of snow last week has settled significantly over the March 18 suncrust and surface hoar. At treeline and above windward and lee features have a 15cm variable hard wind packed layer on the surface. Meltfreeze conditions below treeline, solar meltfreeze to mountaintop. Cornices are huge.

Avalanche Summary

The infrasound network detected 2 large events this morning. A natural size 3 avalanche released from a south aspect in the Purcells on Thursday, this likely failed on the March 18th crust.

A group of skiers accidentally triggered a size 3 in the Teddy Bear Trees on Tuesday, this slab avalanche failed on the March 18th melt-freeze crust.

Confidence

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

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.