Jasper National Park Avalanche Forecast

Issued: Dec 30th, 2020 4:00PM

Wed Dec 30th Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Low
Thu Dec 31st 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Fri Jan 1st 3 Day Outlook
Alpine Considerable Treeline Moderate Below Treeline Moderate

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Persistent Slabs and Deep Persistent Slabs.

Light precip and SW winds over the next two days as we limp into the New Year.

Look for a bit of a stormy refresh coming through the weekend.


Weather Forecast

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

Thursday: Cloudy with sunny periods and isolated flurries and trace accumulations. High of -8 C. Light SW winds at ridgetop.

Snowpack Summary

Varied surface conditions with aspect and geographic location. 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 or reported today. Make your field trip observations count! Share them with the local outdoor adventure community on the Mountain Information Network from Avalanche Canada.


Intensity of incoming weather systems is uncertain on Friday


Persistent Slabs

An icon showing Persistent Slabs



Expected Size

1 - 2.5

In the alpine hard slabs sit overtop of facets. Dec 14th surface hoar to 6mm can be found in sheltered locations up to 2200m.

  • Be aware of the potential for avalanches due to buried surface hoar in isolated areas.
  • Whumphing, shooting cracks and recent avalanches are all strong indicators of an unstable snowpack.


All aspects.


All elevations.

Deep Persistent Slabs

An icon showing Deep Persistent Slabs


Possible - Unlikely

Expected Size

1.5 - 3.5

Be cautious of thick to thin snowpack areas being likely trigger locations. The persistent slabs have the potential to step down to the weakness at the base of the snowpack.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Use caution in thin snowpack areas.


All aspects.


All elevations.

Valid until: Dec 31st, 2020 4:00PM