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Avalanche Forecast

Archived

Mar 26th, 2021–Mar 27th, 2021

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

Regions

Glacier.

Watch for changing conditions that could increase the hazard on Friday. Sun on the slope is heating up the snow fast

Weather Forecast

A ridge of high pressure across southern BC is losing its influence as low pressure moves in from the NW with a series of fronts

Friday: Cloudy, flurries, high -6, light W wind, freezing level 1300m

Saturday: Flurries to 6cm, high -4, strong SW wind, freezing level 1700m

Sunday: 35cm of new snow, strong SW wind, high -4 , freezing level 1700m

Snowpack Summary

40cm of snow has fallen this week over the March 18th sun crust and surface hoar. Short sunny spells are quickly affecting the top 15cm. Crusts have been seen to 2150m on due S aspects, likely higher in steep terrain. The mid pack of rounds is strong and supportive. The below treeline snowpack has has experienced several melt freeze cycles.

Avalanche Summary

Several mid elevation natural moist slabs were observed on Thursday on all aspects. A deep size 3.0 slab was reported near the park on Wednesday failing on the ground. Windslabs can still be found in lee areas. Cornices are large and fragile and should be given a wide berth

Confidence

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

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.