Avalanche Forecast South Columbia

Date Issued: Valid Until:

Avalanche Canada ldreier, Avalanche Canada

Avalanche Forecast

Thu Apr. 11th · 4:34PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
Loose Wet Loose Wet
Wind Slabs Wind Slabs

Alpine

Danger Ratings Considerable

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Considerable

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
As soon as the sun comes out the surface snow will become moist and increase the likelihood of loose wet avalanches. Wind slabs in alpine lee features may still be reactive to human triggering.

Confidence

High -

Weather Forecast

THURSDAY NIGHT: Clear with cloudy periods and isolated flurries / light northeast wind / freezing level 800 mFRIDAY: Mix of sun and cloud / light to moderate westerly wind / alpine high temperature -4 C / freezing level 1800 mSATURDAY: Cloudy / 10-20 cm snow accumulation / moderate to strong southwest wind / alpine high temperature -5 C / freezing level 1700 mSUNDAY: Cloudy / up to 10 cm snow accumulation / light to moderate southwest wind / alpine high temperature -7 C / freezing level 1500 m

Avalanche Summary

On Wednesday, no natural avalanche activity was reported. A human triggered wind slab avalanche of size 1.5 on a north aspect at treeline was observed 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

Last week’s unsettled weather produced 20-50 cm of snow that sits on a melt-freeze crust on all aspects except for north facing slopes above 2000 m, where it sits on dry snow and surface hoar (feathery crystals). On northern aspects the new snow is slowly bonding and humans might still trigger wind slab avalanches. Recent snowfall amounts taper quickly below treeline. Snow is disappearing rapidly at lower elevations.

Problems

Loose Wet

Loose Wet

Expect the snow surface to become moist and the likelihood of loose wet avalanches to increase on sun exposed slopes as soon as the sun is coming out.

Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.Minimize overhead exposure to cornices above.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2
Wind Slabs

Wind Slabs

Wind slabs of various ages can be found in immediate lee features along ridge crests and might still be sensitive to humans triggers.

Be careful with wind-loaded pockets, especially near ridge crests and roll-overs.

Aspects: North, North East, North West.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2