Avalanche Forecast

Issued: Apr 6th, 2018 4:37PM

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

Avalanche Canada jmcbride, Avalanche Canada

New snow and wind beginning late Saturday afternoon will increase avalanche hazard.  If however, the storm arrives earlier than forecasted, hazard ratings will also increase sooner.

Summary

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

TONIGHT: Mostly clear. Ridge wind light to moderate, west. Alpine temperature near -10. Freezing level valley bottom.SATURDAY: Increasing cloud, snow beginning in the afternoon. Accumulation 5-15 cm. Ridge wind moderate to strong, southwest. Alpine temperature near -5. Freezing level 900 m.SUNDAY: Cloudy, flurries. Accumulation up to 5 cm. Ridge wind moderate, west. Alpine temperature near 0. Freezing level 1500 m.MONDAY: Mix of sun and cloud. Ridge wind moderate, west. Alpine temperature near 0. Freezing level 2000 m.

Avalanche Summary

On Friday both natural and easily skier-triggered wind slab releases up to size 1.5 were reported in the southern part of the region.Thursday in the Elkford area, recent small (size 1) loose/dry avalanches were reported on northerly aspects while loose/wet were observed on solar aspects. In the southeast corner of the region skier-triggered loose/dry avalanches were reported to be running far on a recently buried crust.Wednesday small loose wet point releases were reported from steep rocky solar aspects.On Tuesday, small avalanches were observed in the Alexander Creek area. On Monday, small natural avalanches were reported from the region, and ski cutting produced similar small avalanches on wind-loaded features. Also on Monday, explosives triggered one size 2 wind slab avalanche on an east aspect at 2300 m. This avalanche ran on a 60 cm deep crust layer.

Snowpack Summary

10-15 cm of snow sits above a variety of crusts on all but high north aspects. Northern parts of the region have less new snow than southern parts. Wind has formed hard slabs in lee features, and in some cases the snow may be poorly bonded to the crusts.Multiple crusts exist in the top metre of the snowpack. Some parts of the region may have a surface hoar layer roughly 60 cm deep on north aspects at treeline.A well settled midpack sits above sugary facets in many parts of the region, especially thin snowpack areas.

Problems

Wind Slabs

An icon showing Wind Slabs
Winds have formed touchy wind slabs in leeward terrain on a variety of aspects.
Pay attention to overhead hazards like cornices that could possibly trigger slabs.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Cornices

An icon showing Cornices
Cornices are reported to be large and there have been recent observations of cornice releases.
Extra caution needed around cornices with current conditions.Give cornices a wide berth when travelling on or below ridges.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1.5 - 2.5

Valid until: Apr 7th, 2018 2:00PM

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