Avalanche Forecast South Columbia

Date Issued: Valid Until:

Avalanche Canada dsaly, Avalanche Canada

Avalanche Forecast

Sat Apr. 13th ยท 3:33PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
Storm Slabs Storm Slabs

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
Snowfall Saturday accumulated at upper elevations. Use caution around ridge crests and lee terrain features, where deposits will be most reactive.

Confidence

Moderate -

Weather Forecast

SATURDAY NIGHT: Cloudy with isolated flurries, up to 10 cm snow accumulation / southwest wind, 20 gusting to 50 km/h / alpine low -7 C / freezing level 800 mSUNDAY: Cloudy with sunny periods and isolated flurries, 5-10 cm snow / west wind, 20-35 km/h / alpine high -3 C / freezing level 1600 mMONDAY: Mix of sun and cloud with isolated flurries / west wind, 10-15 km/h / alpine high -5 C / freezing level 1700 m TUESDAY: Cloudy with sunny periods and isolated flurries, up to 5 cm snow / southwest wind, 10-25 km/h / alpine low -5 C / freezing level 1900 m

Avalanche Summary

On Friday morning, a size 2 storm slab was observed in a wind-loaded pocket on a west aspect in the alpine.On Wednesday, a skier triggered wind slab avalanche of size 1.5 on a north aspect at treeline was reported in the south of the region.On Tuesday, several natural and human triggered storm/wind slab avalanches 10-50 cm deep and up to size 2.5 were observed on north and east aspects in the alpine. A size 1.5 explosive triggered cornice did not trigger an avalanche on the northeast facing slope below. Several natural loose wet and wet slab avalanches up to size 2 were reported from southeast, south, west and northwest facing slopes (see a MIN report from Glacier National Park).

Snowpack Summary

Up to 20 cm new snow covers a melt-freeze crust on all aspects except for north facing slopes above 2000 m, where the snow stayed dry. On north-facing aspects in the alpine, the recent 20-50 cm snow was redistributed by wind and, in isolated locations, buried surface hoar. Older wind slabs sitting on surface hoar might still be sensitive to human triggers.Below treeline snow is disappearing rapidly.

Problems

Storm Slabs

Storm Slabs

Flurries Saturday accumulated at upper elevations along with wind. Fresh snow may hide recently formed wind slabs. Be cautious around ridge crest and lee terrain where deposits of new snow will be most reactive.

Watch for signs of instability such as whumpfing, or cracking. Be careful with wind-loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2