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Avalanche Forecast

Archived

Dec 31st, 2020–Jan 1st, 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 possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Jasper.

Happy New Year Friends!

Lots of Love!!

From your Jasper, Parks Canada Forecasters!!

Weather Forecast

Tonight, expecting some isolated flurries, with little accumulation. Alpine temperature: Low -11 C, with light SW winds.

Friday, periods of snow with accumulatiuon ~10-15cms over the day. Temperature, High: -5 °C and moderate ridgetop wind SW: 25 km/h gusting to 55 km/h.

Snowpack Summary

Light precipitation and winds over the day. 15-25cm of un-compacted snow over a firm mid-pack with facets and depth hoar lingering near the ground. Mid-December persistent layers, including SH, and SH/FC combos can be found down 25-40cm but, only in isolated and sheltered locations, and almost exclusively in the Icefields region.

Avalanche Summary

No new avalanches observed. Forecasting field team finished off the last of the available fresh tracks in the Churchill slide paths with no instabilities to report.

Make your field trip observations count! Share them with the local outdoor adventure community on the Mountain Information Network from Avalanche Canada.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.