Avalanche Forecast

Issued: Mar 14th, 2017 3:35PM

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

Avalanche Canada triley, Avalanche Canada

Stormy weather continues to keep the avalanche danger elevated. Avoid overhead hazards like cornices and steep cliffs where the snow may be weak.

Summary

Confidence

Moderate - Freezing levels are uncertain

Weather Forecast

Overnight: Freezing levels remaining above 2200 metres, strong southwest winds, and 2-5 mm of precipitation. Wednesday: Freezing levels around 2000 metres during the day, strong southwest winds, and 5-8 mm of precipitation. Thursday: Daytime freezing level around 1500 metres, moderate southwest winds, and periods of flurries or light snow. Friday: Freezing to valley bottoms, light southwest winds, and mostly sunny with strong solar radiation.

Avalanche Summary

Wind slabs are expected to continue to develop in the alpine above the high freezing levels. At lower elevations, snow may be moist or wet and release easily in pockets of loose wet snow. The possibility of deep persistent avalanches continues during this period of warm and stormy weather.

Snowpack Summary

A warm, wet, and windy storm will form fresh wind slabs at higher elevations while rain with fall below treeline. March has delivered regular storms with roughly 50-90 cm of snow sitting above crust and facet interfaces from February. In some areas the snow above these interfaces may have a poor bond. The mid-pack in this region is generally strong, but the bottom third of the snowpack is composed of weak sugary facets roughly 1-1.5 metres deep. This remains a concern and should be on your radar, especially with the recent loading and ongoing warming.

Problems

Wind Slabs

An icon showing Wind Slabs
Wind slabs are expected to continue to develop due to the forecast new snow and wind.
Be cautious as you transition into wind affected terrain.Be alert to conditions that change with elevation and time of day.Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2

Deep Persistent Slabs

An icon showing Deep Persistent Slabs
Storm loading and warming may increase the likelihood of triggering large deep persistent slab avalanches. Cornice falls may trigger deep persistent weak layers.
Watch for clues, like sluffing off of cliffs, that the snowpack is warming up. Avoid steep convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

2 - 3

Valid until: Mar 15th, 2017 2:00PM