Avalanche Forecast

Issued: Jan 15th, 2017 3:59PM

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

Avalanche Canada shorton, Avalanche Canada

One more day of cool weather until rising temperatures elevate the danger.

Summary

Confidence

Moderate - Freezing levels are uncertain on Tuesday

Weather Forecast

MONDAY: Increasing cloud throughout the day, moderate southwest winds increasing throughout the day, alpine temperatures around -8 and warming overnight.TUESDAY: Flurries with up to 5 cm of new snow, strong southwest winds, freezing level rising to 1600 m.WEDNESDAY: Continued flurries with minor accumulations, strong southwest winds, freezing levels steady around 1600 m.

Avalanche Summary

Several size 1-1.5 natural loose dry avalanches were reported on solar aspects over the weekend. On Saturday, ski cutting produced a size 2 avalanche on a wind-loaded northeast aspect at 1900 m. The avalanche was suspected to release on a weak layer of facets underneath the wind slab.On Monday, expect wind slabs to remain reactive to human triggers on a variety of aspects.

Snowpack Summary

Up to 20 cm of recent storm snow has buried a plethora of old surfaces (wind scoured, old wind slabs, surface hoar up to 20 mm in sheltered terrain, and/or faceted old snow). Moderate winds from all directions have formed widespread wind slabs which can be found on lee slopes and behind mid-slope terrain features. Deeper in the snowpack, the mid-December persistent weak layer of facets has been more prominent and reactive in the Corbin area than areas closer to Fernie. The layer is generally considered dormant at the moment in deeper snowpack areas, but its status may change as the temperatures warm this week.

Problems

Wind Slabs

An icon showing Wind Slabs
Lingering wind slabs can be found on a variety of aspects and may become sensitive to human triggering with warming temperatures.
Avoid areas where the surface snow feels stiff or slabby.Use ridges or ribs to avoid pockets of wind loaded snow.Watch for signs of instability such as whumpfing, or cracking.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Jan 16th, 2017 2:00PM