Bulletin d’avalanche – 15 mars 2019

Avalanche Bulletin - 2019-03-15

The weather will bring rain for 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: 2019-03-15 @ 07:30
Valid until: 2019-03-17 @ 07:30
Danger ratings Friday Saturday Overview following days
Alpine Considerable Considerable Low
Treeline Considerable Considerable Low
Below treeline Considerable Considerable Low

Avalanche problem #1 : Wet slab

Wet slab avalanches (size 2 and +) are likely on alpine and treeline slopes with rainfall amounts (5-10 mm), above zero temperatures and warm winds that are forecasted for today and tomorrow.  The avalanche condition will improve progressively during the day of Saturday with the colder temperature forecasted. With a CONSIDERABLE rating, natural avalanches (are possible and skier triggered avalanches are likely. These avalanches can be large enough to injure, bury or kill a person (size 2). Keep in mind that wet avalanche gain in mass rapidly and can be destructive.

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. A wet slab avalanche could also trigger this weak layer lower in the snowpack specially with the rain and temperatures above freezing level forecasted for the next two days.

Avalanche activity

A few wet loose avalanches were observed yesterday at Mont Albert. Please share your observations at info@avalanchequebec.ca, on the Avalanche Canada’s Mountain Information Network or with this online form.

Snowpack

At Mount Albert yesterday, the first 5 cm of the surface were very humid by intense solar radiation and very warm temperatures, up to 10C! Our observations in the alpine and at the treeline have revealed a succession of wind slabs (20-40cm) on the S-SE-E slopes which rest on a very firm surface. They can be very reactive today and tomorrow with temperatures above freezing point and rain expected (5-10mm). Elsewhere we find surfaces eroded by the wind, rock, a crust and a sandwich of wind slabs quite well consolidated. Below treeline, the surface is wet  and no apparent wind slabs.

Weather forecast

Friday: Strong to extreme winds will blow SO today. Temperatures will reach +5.0 in the mountains and the freezing level will reach 1650m. Rain is forecast for a total of between 5 and 10mm. Friday night and night: The minimum temperature will reach +1.0 in the mountains with moderate SW winds. Saturday: We expect 3 to 5 cm of snow. The maximum temperatures for the day will remain slightly above the freezing point (Max +1.0) but will drop in the afternoon with the winds turning to NO bringing the freezing level to 100 meters.

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 14 mars 2019 à 08:15

24 h 48 h 7 jours Saison Au sol
0 cm 2 cm 28 cm 365 cm 109 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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