Avalanche Forecast

Issued: Dec 15th, 2016 4:39PM

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

jsmith, Avalanche Canada

South Rockies.

Isolated wind slabs may exist below ridgetops. Use caution when transitioning into wind affected terrain.

Summary

Confidence

Moderate - Wind speed and direction is uncertain

Weather Forecast

Friday: Mix of sun and cloud / Light northeasterly winds / Average temperature at treeline -20 C.Saturday: Mostly sunny / Light to moderate northwesterly winds / Average temperature at treeline -20 C.Sunday: Mostly sunny / Light to moderate westerly winds / Average temperature at treeline -15 C.

Avalanche Summary

On Wednesday, no new avalanches were reported in this region.

Snowpack Summary

Wind slabs may exist in isolated lee features below ridgetops but are not expected to be widespread due to relatively light wind speeds thus far. The cold temperatures have promoted surface faceting, which probably means the top layer of snow is soft in sheltered areas. Treeline snow depths around Elkford are only around 60 cm. In shallow areas, the snowpack is most likely facetted (sugary) throughout, and any crusts have probably broken down already. In deeper areas, you can likely find the mid-November crust buried down around 50 cm. Below treeline, early season hazards such as stumps, rocks, and open creeks are still a major concern.

Problems

Wind Slabs

Recently formed wind slabs may be reactive to triggering in immediately leeward terrain features. Ongoing outflow winds will continue to build these slabs. Watch for signs of recent wind transport and avoid areas where the surface snow feels stiff.

Be cautious as you transition into wind affected terrain.Use ridges or ribs to avoid pockets of wind loaded snow.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Dec 16th, 2016 2:00PM