Archived

Avalanche Forecast

Apr 4th, 2018–Apr 5th, 2018

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Regions: Lizard-Flathead.

The primary avalanche concerns are wind slabs in exposed terrain and cornices along ridgelines.

Confidence

High -

Weather Forecast

Thursday: Around 5 cm new snow. Freezing level around 600 m. Moderate easterly to northeasterly winds.Friday: Flurries. Freezing level around 600 m. Light easterly winds.Saturday: 5-10 cm new snow. Freezing level around 700 m. Light easterly winds.

Avalanche Summary

Numerous small slab avalanches have been reported in the top 10-20 cm of snow all through this week. It appears as though moderate amounts of new snow with just the right amount of wind have continuously set up thin, but touchy wind slabs in a variety of places. While these have been mostly small (size 1), a size 2 wind slab avalanche was reported near Fernie on Wednesday morning on a northeast aspect at approximately 2000 m.

Snowpack Summary

20-30 cm storm snow sits above a variety of crusts on all but high north aspects. Wind has formed isolated slabs in lee features, and in some cases snow may be poorly bonded to the crusts.There are some reports of a surface hoar layer roughly 80 cm deep on north aspects at treeline, but no recent avalanche activity on this layer. A layer of sugary facets around a crust exists near the bottom of the snowpack, but this layer has been inactive for some time.Cornices are large along ridgetops and were actively failing last week.

Avalanche Problems

Wind Slabs

Wind slabs have been a consistent feature for several days and will continue to be an issue in exposed terrain. Shifting winds means you should look out for wind slab on almost all aspects.

Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Pay attention to overhead hazards like cornices which could easily trigger slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Cornices

Cornices are reported to be large and several cornice failures have recently been noted.

Extra caution needed around cornices with current conditions.Give cornices a wide berth when travelling on or below ridges.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1.5 - 3