Avalanche bulletin

Issued around 6 pm every day from December 1 to April 30

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Date issued
Sunday 05 February 2023, 17 H 00
Valid until
Monday 06 February 2023, 18 H 00
Prepared by
jpgagnon

The best snow is definitely below treeline. Higher up, the wind has hardened or even made the snow disappear.

Monday

Alpine
Treeline
Below Treeline

Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Alpine Moderate
Treeline Moderate
Below Treeline Low

Tuesday

Alpine Moderate
Treeline Moderate
Below Treeline Low

Wednesday

Alpine Moderate
Treeline Moderate
Below Treeline Low
Travel advice
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Avalanche problem 1 : Wind Slab

What Elevation?
What Elevation?
Which Slopes?
Which Slopes?
Chances of Avalanches?
Chances of Avalanches?
Expected Size?
Expected Size?
Significant new wind slabs can be found on leeward slopes and in cross loaded locations of the alpine and treeline. They rest on a fragile layer that seems to offer a good potential for propagation.

Avalanche problem 2 : Persistent Slab

What Elevation?
What Elevation?
Which Slopes?
Which Slopes?
Chances of Avalanches?
Chances of Avalanches?
Expected Size?
Expected Size?
With the cold temperatures, facetted grains developed on and under the January 18 ice crust. We have been getting regular test results showing avalanche triggering potential for the past few days. As with any persistent slab problem, the problem is very sporadic, almost isolated and the spatial variability is significant. It is therefore possible to test a few meters away and get a completely different results on this crust. The probabilities of triggering are low, but the consequences could be very unfortunate. The problem seems to be a little more important at the treeline, where the snowpack is thinner, near natural obstacles, such as trees or rocks.

Avalanche Summary

No new avalanche was reported since last Thursday.

Thanks for contributing to the collection of this valuable data by sharing with other users on the Mountain Information Network or by writing to us directly at bulletin@avalanchequebec.ca.

Snowpack Summary

With the extreme westerly wind that blew for 2 days, much of the available snow was moved into the alpine and treeline forming new wind slabs. As a result, a great deal of spatial variability is present in windy areas, from wind slabs to wind-affected snow to ice or rock. With the cold temperatures, facets are developing over the January 18 crust and have demonstrated some weaknesses in our tests.

In general, the height of the snowpack varies from 70 to 90 cm in the valley to 100 to 150 cm at mid-mountain.





Weather Summary

Forecast for the Chic-Chocs ridges and summits.

A weak low-pressure system arriving from the north will pass over the region on Sunday evening and Monday morning and is followed by a high-pressure system bringing good weather until Tuesday.

Sunday evening and night: Light snow showers (1 to 3 cm). Wind northwest 10 to 20 km/h. Low -18.

Monday: Intermittent snow (1 cm). Wind northwest 20 to 30 km/h. High -14.

Tuesday: Sunny. Wind southeast 30 to 50 km/h. High -11.

Wednesday: Snow showers (3 to 4 cm). Wind northwest 40 to 80 km/h. High -8.

For more details, check the Alpine Weather Forecast.

Confidence: Moderate
  • Uncertainty is due to the fact that persistent slabs are particularly difficult to forecast.
  • Uncertainty is due to the extreme variability of wind effect on the snowpack.

For backcountry rescue call 911 and tell them you are in the Chic-Chocs

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BE OUR EYES ON THE GROUND

By sharing your observations, you contribute to the accuracy of the avalanche bulletin and to the safety of all Chic-Chocs backcountry riders

Create a MIN report on the Mountain Information Network to share an avalanche observation or incident (public)

BE OUR EYES ON THE GROUND

By sharing your observations, you contribute to the accuracy of the avalanche bulletin and to the safety of all Chic-Chocs backcountry riders

Create a MIN report on the Mountain Information Network to share an avalanche observation or incident (public)