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Avalanche Forecast

Archived

Apr 1st, 2021–Apr 2nd, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Watch for fresh pockets of windslab if you can see transport at ridgetop.

Scale back your exposure on slopes that have a buried suncrust if/when the sun pops out this afternoon.

Weather Forecast

A weak cold front passing this afternoon/evening will give increasing wind and isolated flurries.

Today: Mostly cloudy with isolated flurries. Alpine high -2 C. Ridge wind light gusting strong SW. Freezing level 1800m.

Tonight: Clear periods. Low -8 C. Light-mod SW wind.

Friday: Isolated flurries. Alpine High -6 C. Light SW wind.

Sat: Flurries (12 cm).

Snowpack Summary

A fresh breakable crust on solar aspects may break down if the sun comes out this afternoon. Recent winds have built pockets of slab in alpine and treeline lees.  The March 18th layer (a crust on Solar aspets and isolated surface hoar on sheltered Northerly aspects) is now buried 60-100cm depending on aspect and elevation. Cornices are huge.

Avalanche Summary

No new avalanches were observed on Wednesday.

A skier accidental occurred Tuesday in the Teddy Bear Trees. The slab avalanche was a healthy size 3, and failed on the March 18th melt-freeze crust. There was also a MIN report of a skier accidental and skier remote avalanche in the Hermit Moraines area Tuesday, click here for more details.

Confidence

Due to the number of field observations

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.