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Avalanche Forecast

Archived

Mar 25th, 2021–Mar 26th, 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 possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Watch for changing conditions that could increase the hazard on Thursday. Unexpected flurries or sun on the slope are things to watch out for

Weather Forecast

A departing low is giving way to air moving in from the northwest bringing cool, unsettled weather.

Thursday: A trace of snow, high of -6 and light NW wind, freezing level 1600m

Friday: 5cm, high -5, strong W wind and freezing level 1500m

Saturday: A trace of snow, high of -5, strong SW wind, freezing level 1600m

Snowpack Summary

40cm of snow has fallen this week over the March 18th sun crust and surface hoar. Below this is a strong mid pack of rounds at treeline and above. The below treeline snowpack has has experienced several melt freeze cycles.

Avalanche Summary

Several natural avalanches were observed yesterday in the highway corridor and Connaught Creek to size 2.0, slabs and loose wet. A deep size 3.0 slab was reported from nearby failing on the ground. Windslabs are reactive to skiers and cornices are large and fragile and should be given a wide berth

Confidence

Forecast snowfall amounts are 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.

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.