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Avalanche Forecast

Archived

Feb 1st, 2021–Feb 2nd, 2021

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

Regions

Little Yoho.

Avalanche control is happening on Mt Stephen on Tuesday, no climbing on any of the Mt. Stephen ice climbs. An avalanche cycle is underway. After a long period of stable snow, it's time to step back and reset your expectations once again.

Weather Forecast

A front stalled over the Rockies region continues to deposit heavy snow, although this continues to vary widely, almost by valley. Overnight on Monday and through Tuesday we expect to see another 10-30 cm of snow with freezing levels remaining about 1500 m. Although winds will pick up, they are lighter than usual for a storm of this magnitude.

Snowpack Summary

Up to 40cm of storm snow has fallen at the higher elevations by Tuesday. This snow is deep and low density below treeline and is forming slabs up to 100 cm deep at treeline and alpine areas where the wind is doing some light drifting. Watch for any slab formation in the new snow and dry loose avalanches running easily in gullies and steep terrain.

Avalanche Summary

Minimal observations due to poor visibility but small, dry loose avalanches were observed on a field trip up 93N today.

Confidence

Forecast snowfall amounts are uncertain on Tuesday

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.