Avalanche Bulletin - 2019-03-13

Very variable conditions in the mountains today!
Areas concerned: Mont Albert, mont Hog’s Back, Champs-de-Mars, mont Lyall, mont Vallières-de-Saint-Réal, mont Blanche-Lamontagne et Mines-Madeleine
Issued on: 2019-03-13 @ 07:30
Valid until: 2019-03-15 @ 07:30
Danger ratings Wednesday Thursday Overview following days
Alpine Moderate Moderate Considerable
Treeline Moderate Moderate Considerable
Below treeline Low Moderate Considerable

Avalanche problem #1 : Wind slab

There are new wind slabs of varying thickness near the ridges and summits of the alpine and cross loaded slopes at tree line on S-SE apects. Other wind slabs N (NO-N-NE-E) are still present. With mild temperatures and sun breakthroughs expected for the next two days (freezing level could rise to 900m on Thursday), these wind slabs could be more reactive. With a MODERATE danger, skiers may trigger avalanches large enough to injure, bury or kill a person (size 2) while natural triggers are unlikely. Use extra caution when the temperature reaches values ​​around the freezing point combined with solar radiation today.

Avalanche problem #2 : Persistent slab

Although the facetted grain layers above and below the January 24 crust seem less reactive, they are still present at about 80-100 cm deep in the snowpack. The probability of triggering an avalanche on this weak layer is rather low, but the consequence is very important since they can produce very large avalanches. Human triggering is possible especially in thin snowpack areas on NE-E-SE-S-SW slopes in the alpine. A wind slab avalanche could also trigger this weak layer lower in the snowpack specially with the mild temperatures forecasted for the next two days.

Avalanche activity

Some sluffs have been reported in the area of ​​Mines Madeleine in the day of Monday. Please share your observations at info@avalanchequebec.ca, on the Avalanche Canada’s Mountain Information Network or with this online form.

Snowpack

The storm of the beginning of the week will have left between 20 and 30 cm of snow in places. The conditions are extremely variable now in the mountains. The new snow mixed with the very changeable winds of the last 72 hours have generated a very uneven snow distribution too. In the alpine and at the treeline, wind slabs are present on all aspects except the slopes O-SO. Some small cracks under the skis and stability tests with easy to moderate results were observed. Elsewhere we find surfaces eroded by the wind, rock, a crust or a sandwich of wind slabs quite well consolidated. Below treeline, less cohesive snow is found on soft wind slabs.

Weather forecast

Wednesday : Mainly sunny. Increasing cloudiness this afternoon. Wind up to 15 km/h. High zero. Wind chill minus 19 in the morning. Wednesday evening and night : Mainly cloudy with 30 percent chance of flurries. Wind up to 15 km/h. Low minus 5. Wind chill minus 6 in the evening and minus 11 overnight. Thurdsay : Mainly cloudy. 30 percent chance of flurries in the morning. High plus 5. Friday : Periods of rain. High 6.

Message

The Festi Haute Route and Télémark du Mont-Édouard will be held this weekend. The Avalanche Québec team will be on hand to meet you. For more details; visit the event website https://www.facebook.com/festitelemark/. Write to us at info@avalanchequebec.ca.

Snow report

Centre de découverte et de services - Mis à jour le 12 mars 2019 à 07:00

24 h 48 h 7 jours Saison Au sol
0 cm 18 cm 30 cm 363 cm 114 cm
Disclaimer This avalanche bulletin is prepared with the most recent weather, snowpack and avalanche activity data available for the Chic-Chocs. It is strictly information that can be used as a part of a decision making process and is not intended to be a replacement for knowledge about avalanche safety including and not limited to safe travel practices and the use of backcountry rescue equipment such as beacon, shovel and probe.

Prepared by : Jean-Raphael Lemieux

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