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Avalanche Forecast

Archived

Feb 5th, 2021–Feb 6th, 2021

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

Regions

Glacier.

Spacial variability is the name of the game right now. The recent storm snow remains reactive in isolated locations in the Park. Use safe travel practices to mitigate the uncertainty.

Weather Forecast

Today will be mainly cloudy with isolated flurries and trace amounts of accumulation. The alpine high will reach -8c with winds from the west, 20km/h gusting to 65km/h. Light accumulation is expected for the weekend before an high-pressure arctic outflow sends temperatures plummeting late Sunday. Models show temps dropping to -28 next week.

Snowpack Summary

Storm slabs continue to receive new inputs in the form of fresh snow and wind. 60+ cm of storm snow from earlier this week sits on Surface Hoar, Crusts, and or Facets depending on elevation and aspect, on what is being called the January 24th persistent weak layer. The mid and lower snowpack is quite strong, with no current concerns.

Avalanche Summary

No new avalanches were observed in the highway corridor however visibility was limited. A field team in the Connaught Creek drainage observed several size 3 avalanches from the February 2 storm. They observed a new size 2.5 in Cheops N 4 from yesterday morning and heard an audible avalanche from Cheops N around mid-day.

Confidence

on Friday

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.

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.