Avalanche Forecast

Issued: Mar 7th, 2015 7:53AM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada jlammers, Avalanche Canada

Recent snow accumulations vary across the region, as do forecast snowfall amounts. Pay attention to how much new snow is falling in your area, and choose terrain accordingly.

Summary

Confidence

Poor - Due to the number of field observations

Weather Forecast

A pacific moisture stream will intensify throughout Sunday and then ease slightly on Monday. Although there is some model disagreement in regards to snowfall amounts, up to 10cm can be expected on Sunday, with another 5cm possible on Monday. A mix of sun and cloud is forecast for Tuesday. Winds are expected to remain strong to extreme from the west/southwest. Freezing levels may spike to 1500m on Sunday, and then hover between 500m and 1000m on Monday and Tuesday.

Avalanche Summary

There have been no new reports of avalanche activity, although this may speak more to a lack of observations rather than actual conditions. I'm sure there was some recent wind slab activity in response to new snow and wind prior to the weekend. With more snow and wind forecast for Sunday and Monday, I would expect further wind slab activity, especially in areas to the west which are forecast to receive more snow.

Snowpack Summary

New snow and strong SW winds have likely built reactive wind slabs in exposed lee terrain. More snow and wind on Sunday will add to the developing wind slab problem. These overlie a variety of interfaces including older wind slabs, a sun crust, an old rain crust, surface hoar, and/or surface facets. At the base of the snowpack, weak facets may be found. Keep an eye out for cornices that could fail.

Problems

Wind Slabs

An icon showing Wind Slabs
New wind slabs are expected to develop on Sunday, especially in areas to the west of the region where more snow is expected. Watch for triggering in the lee of ridge crests and terrain breaks.
Use ridges or ribs to avoid pockets of wind loaded snow.>Be cautious as you transition into wind affected terrain.>

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Mar 8th, 2015 3:00PM