Bulletin d’avalanche – 10 janvier 2019

Avalanche Bulletin - 2019-01-10

Storm in effect and snow forecasted until Friday night
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: 2019-01-10 @ 07:30
Valid until: 2019-01-12 @ 07:30
Danger ratings Thursday Friday Overview following days
Alpine Considerable Considerable Moderate
Treeline Considerable Considerable Moderate
Below treeline Moderate Moderate Low

Avalanche problem #1 : Storm slab

With 10-15 cm of snowfalls from Wednesday and more to come (10-15 cm), storm slabs can build Thursday and Friday. These slabs will be reactive at treeline and above on most aspects with variable winds blowing during these two days. Xmas crust is always buried near the surface which creates a good bed surface for avalanches. With a CONSIDERABLE danger rating, natural avalanches are possible and skiers can likely trigger avalanches large enough to bury or injure them (size 2) as they can hit rocks and trees downslope.

Avalanche activity

A wind slab avalanche was triggered by a group of skiers on an SE alpine slope at Mur des Patrouilleurs, Mont Albert, Tuesday, January 8th. The slab was about 25-40cm deep, 125 m long and 25m wide. Please share your observations at info@avalanchequebec.ca, on the Avalanche Canada’s Mountain Information Network or with this online form

Snowpack

10-15 cm of new snow fell since Wednesday and extreme winds blew from SE-E-NE.  In the alpine and at treeline, the crust is present at the surface in areas swept by recent winds and covered by isolated accumulations up to 90 cm on the other slopes. Wind slabs (30-45 cm) of various densities have been observed at the surface at the top of the alpine slopes and on cross-loaded areas at treeline. The snow conditions are still marginal with rocks, stumps, and trees on the surface or barely covered by new snow. Travelling is perilous in the alpine. Below the treeline, about 30-40 cm of snow covers the Christmas crust and the snow height varies between 45 and 90 cm.

Weather forecast

A storm will rage Thursday in the Chic-Chocs. In total, 10-15 cm of snow is forecasted until Friday night on most sectors with greater accumulations (20-25 cm) on the Northern sectors. Thursday, North East winds will blow (50-80 km/h) on summits and temperatures should range between -5 and -10C. Friday, winds will ease off (25-40 km/h) and veer North-West, creating snow showers (squalls). Maximum temperatures will be around -10C in the valley and -15C on ridge tops.

Message

The January 8th avalanche accident on Mont Albert raises a lot of interest and questions. Check our Facebook page for the last details. A complete report will be written soon and will be available on Avalanche Quebec’s website (French only)

Snow report

Centre de découverte et de services - Mis à jour le 10 janvier 2019 à 06:20

24 h 48 h 7 jours Saison Au sol
6 cm 9 cm 16 cm 114 cm 34 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 : J. LeBlanc

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