Avalanche Forecast

Issued: Mar 12th, 2018 3:45PM

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

Avalanche Canada mbender, Avalanche Canada

Expect avalanche danger to increase as the temperature rises through the day. Danger ratings are rated for the heat of the day when the likelihood avalanches triggering is highest.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

TUESDAY: mainly cloudy with sunny breaks and wet flurries in the afternoon / Moderate south wind / Alpine temperature 6 / Freezing level 2600m  WEDNESDAY: Mainly cloudy with isolated flurries or rain showers / Light west wind / Alpine temperature -1 / Freezing level 1300m  THURSDAY: Cloudy with scattered flurries / Light west wind / Alpine temperature 0 / Freezing level 1600m 

Avalanche Summary

Reports from Sunday show primarily solar induced avalanches size 1.5-2 on south and west facing sun exposed slopes during the heat of the day. On Saturday a skier triggered size 2 wind slab avalanche was reported from the north of the region on a northeast aspect in the alpine. There was also a report of natural size 2 wind slab avalanche on a northwest aspect in the alpine. Avalanche activity on Friday was reported as either loose dry to size 1 or wind slab activity to size 1-1.5 on northerly aspects at tree line.

Snowpack Summary

Recent new snow has been redistributed by southerly winds at upper elevations and has now been affected by above freezing temperatures except for high (above 1800m) northerly facing slopes. The new snow sits on a sun crust on steep south-facing slopes, cold dry snow and possibly small surface hoar on shady aspects.In northern parts of the region a weak layer buried mid-February is about 40-50 cm below the surface and has been reactive in some snowpack tests. The layer is composed of sugary facets, a sun crust on solar aspects, and surface hoar that is present at and below treeline. The snowpack is well settled in southern parts of the region i.e.Coquihalla and Manning Park.Variable winds in the past month have created cornices on many alpine ridgelines. They become touchier as they grow in size, as temperatures rise, and as the strong late-winter sun shines down upon them on clear days.

Problems

Wind Slabs

An icon showing Wind Slabs
New snow combined with predominantly southwest winds have created wind slabs in the lee of terrain features.
Extra caution needed around cornices with current conditions.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.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 2

Loose Wet

An icon showing Loose Wet
Sun combined with rising freezing levels will weaken the surface snow on slopes exposed to the sun.
Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

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

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 2

Valid until: Mar 13th, 2018 2:00PM