Avalanche Forecast

Issued: Feb 21st, 2018 9:00AM

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

VIAC Jesse Percival, VIAC

Summary

Confidence

High - Forecast models agree, for now.

Travel & Terrain Advice

Seek low angle terrain and areas shelter from the wind. Ensure a wide berth when travelling either above or below cornices.

Avalanche Summary

On Tuesday explosive testing produced small results size one loose on a north east aspect at tree line . This feature was wind loaded and unsupported but did not perform as expected. No new natural avalanches observed.

Snowpack Summary

Variety of surface conditions as a result of strong predominantly north wind, exposed ridge top areas scoured to the valentines day crust and in protected areas the crust can be found down an average of 40 cm.The crust and new snow are bonding moderately well, The crust is thick and very strong, below this the mid and lower snow pack is settled and dense.

Snowpack Details

Surface: New low density snow. Upper: Melt freeze crust from 30 to 90 cm thick. Mid: Well settled. Lower: Well settled.

Past Weather

Cool temperatures, clear skies and moderate north west wind.

Weather Forecast

A mass of arctic air dominates the region with the occasional disturbance descending from the north bringing to the forecast area some light precipitation. Freezing levels and temperatures are expected to remain low. North winds will continue to be light to moderate. Wednesday: 0 to 5 cm new snowfall temps -12 to -4, winds moderate north west, freezing level 0 m rising to 800 m mid day. Thursday: no new snowfall temps -12 rising to +1, winds moderate west, freezing level 0 m rising to 200 m mid day. Friday: no new snowfall temps -5 to 0 winds light to moderate north west , freezing level 250 m rising to 1000 m mid day.

Problems

Wind Slabs

An icon showing Wind Slabs
Winds slab will predominantly be found on lee aspect but will as well be found on cross loaded features that face the wind. Touchy to human triggers, these avalanches once initiated will produce large avalanches , size two.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

1 - 2

Cornices

An icon showing Cornices
Cornices are large and can be found on north aspects at both the treeline and the alpine. If triggered these could produce an avalanche big enough to bury injure or kill a traveler. Take the time to identify these features and ensure a wide berth when travelling either above or below them.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Feb 23rd, 2018 9:00AM