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Avalanche Forecast

Archived

Mar 23rd, 2021–Mar 24th, 2021

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

Little Yoho.

Pay attention to local wind effect. There is lots of snow available for transport and there have been reports of increased wind slap development in the alpine.

Weather Forecast

Wednesday will be overcast with light flurries throughout day (total accumulation at treeline ~5-10 cm). Winds will be westerly 40-60 km/h in morning and diminish throughout day. Freezing levels will rise to 16-1700m in afternoon.

Snowpack Summary

15-40 cm of snow has fallen at treeline since March 19th with variable SW-NW winds. This storm snow sits over a sun crust (up to ridge tops) on solar aspects, and over a mix of surfaces on North aspects including facets and spotty surface hoar, and over a temperature crust at lower elevations. Thin areas becoming isothermal below treeline.

Avalanche Summary

Several small natural wind slab were observed out of steep alpine terrain throughout region today. Sunshine reported skier triggered wind slabs and loose dry up to size one. One wet loose avalanche reported from Haffner Creek out of steep rocky terrain at 1800 m.

Confidence

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.

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.

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.