Avalanche Forecast North Columbia

Date Issued: Valid Until:

Avalanche Canada kdevine, Avalanche Canada

Avalanche Forecast

Sat Mar. 9th · 4:41PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low
Storm Slabs Storm Slabs

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low
Storm slabs may be reactive to human triggering, especially in wind loaded areas and on sun exposed slopes.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Monday

Weather Forecast

SATURDAY NIGHT - Cloudy with clear periods / light west wind / alpine low temperature near -12SUNDAY - A mix of sun and cloud / light southwest winds / alpine high temperature near -8 / freezing level 1200 mMONDAY - Flurries, 5-10 cm / southwest winds 20-40 km/h / alpine high temperature near -7 / freezing level 1400 mTUESDAY - Mainly cloudy with isolated flurries / southwest winds 10-30 km/h / alpine high temperature near -8 / freezing level 1100 m

Avalanche Summary

On Friday, there were  reports of human triggered storm slab avalanches up to size 2. There were also reports of a natural avalanche cycle to size 2.5 in the neighboring Glacier National Park region.On Thursday, there were reports of a few human triggered size 1 storm slab and loose snow avalanches. There were also a few reports of explosives triggered avalanches size 2-2.5.On Tuesday there was one size 1 persistent slab avalanche reported on a north aspect at 1100 m. It failed on the late January persistent weak layer, 40 cm deep and was triggered remotely (from a distance).

Snowpack Summary

10-30 cm of recent storm snow is sitting mainly on wind slabs and facets (sugary snow), as well as surface hoar (feathery crystals) in sheltered areas and a crust on sun exposed slopes. There are a two weak layers in the upper snowpack that were buried in mid and late January. These can be found approximately 40-80 cm deep. Both layers consist of surface hoar and may be associated with a crust on steep, south facing slopes. These weak layers have been most reactive at lower elevations. Avalanche occurrences on these layers have tapered significantly, however it may still be possible to trigger an avalanche on these layers in isolated areas such as steep cutblocks and large open glades.The lower snowpack is generally considered to be strong, except for shallow, rocky areas where the cold temperatures continue to facet (weaken) the snowpack.

Problems

Storm Slabs

Storm Slabs

Storm slabs may continue to be reactive, especially in wind loaded areas and on sun exposed slopes.

Exercise increased caution around wind loaded pockets near ridge crests and roll-overs.Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 1.5