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Avalanche Forecast

Archived

Mar 27th, 2021–Mar 28th, 2021

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

Regions

Glacier.

Snowfall and wind will ramp up the hazard through the weekend, reaching a peak Sunday afternoon.

Weather Forecast

Low pressure moving in from the NW is sending a couple of fronts our way.

Today: Flurries to 6cm. Alpine high -3. Ridgetop wind strong SW. Freezing level (Fzl) 1700m

Tonight: Snow (15cm). Low -5. Strong SW wind. Fzl 1300m

Sunday: 15-20cm of snow. Strong SW wind. High -4. Fzl 1500m

Monday: Sun and cloud mix. Low -15, High -12. Moderate W wind. Fzl 500m

Snowpack Summary

Ongoing snowfall and wind (up to 15cm in the past 24hr) has created reactive slabs. Snowfall totals of up to 55cm over the March 18th interface (this has been reactive just West of the park, on sheltered North aspects where it is surface hoar). The mid pack is strong and supportive. The below treeline snowpack has seen several melt freeze cycles.

Avalanche Summary

There were a few MIN reports of pockets of reactive windslabs on Friday, these will continue to increase in size through the weekend.

Several mid elevation natural moist slabs were observed on Thursday on all aspects.

Cornices are large and fragile and should be given a wide berth

Confidence

Forecast snowfall amounts are uncertain on Sunday

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.

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.