Avalanche Forecast

Issued: Dec 16th, 2014 8:02AM

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

Avalanche Canada ccampbell, Avalanche Canada

If the riding is good, the snowpack stability might not be.

Summary

Confidence

Fair - Due to the number of field observations

Weather Forecast

Mainly cloudy and dry for most of the day on Wednesday with light snow starting in the evening and continuing all day Thursday before picking up on Friday with 5-10 cm expected by Friday evening. temperatures are expected to gradually increase throughout the forecast period with daytime highs nearing zero degrees in valley bottoms by Friday. Ridge top winds should remain light from the southwest.

Avalanche Summary

There we no new reports of avalanches on Monday or Tuesday morning.

Snowpack Summary

Surface hoar is growing on a thick hard supportive rain crust that extends as high as 2100 m. Sun-exposed slopes are undergoing daily surface melt-freeze cycles, while shady slopes have a skiff of dry snow on the crust. Critical slopes are high elevation north aspects where facets or buried surface hoar from earlier in the month may be lurking under dense storm slabs, and older facet/crust weaknesses may be persisting. Recent snowpack tests at 2050 m in a NW aspect in Kootenay Pass produced moderate sudden results down 35 cm under the late-November crust and down 79 cm on facets above the early-November crust. Meanwhile in the Southern Purcells, snowpack tests gave easy sudden planer results on well preserved surface hoar where it was found down 30 cm on high north aspects.

Problems

Persistent Slabs

An icon showing Persistent Slabs
Old facet/crust weaknesses may still be sensitive to triggers on slopes that aren't bridged by a thick surface crust. Generally shady aspects above 2100 m.
Caution around convexities or areas with a thin or variable snowpack.>Be aware of thin areas that may propogate to deeper instabilites.>

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 4

Valid until: Dec 17th, 2014 2:00PM