Avalanche Forecast South Coast Inland

Tuesday 5th February 2019

Avalanche Danger Ratings Tue 5th Feb 4:18PM Danger Ratings Alpine: Moderate Danger Ratings Treeline: Moderate Danger Ratings Below Treeline: Low Wind Slabs Wind Slabs

Avalanche Canada Forecaster: swerner

Date Issued:

Valid Until:

Wind slabs have formed on a variety of aspects due to shifting winds. Natural avalanche activity has tapered off but human triggered avalanches remain possible.

Confidence

High - The weather pattern is stable

Weather Forecast

The arctic ridge will continue to bring cold, outflow winds and dry weather to the coast tomorrow. Thursday will see a slight change when the low slides south bringing some precipitation. Wednesday: Sunny with some cloudy periods. Alpine temperatures near -8 with light ridgetop winds from the North.Thursday: Cloudy with sunny periods. Alpine temperatures near -6 with light ridgetop winds from the North and freezing levels 800 m.Friday: A mix of sun and cloud isolated flurries. Alpine temperatures near -10 with light ridgetop winds from the northeast. Freezing levels valley bottom.

Avalanche Summary

On Monday, wind slabs were easily triggered by the weight of a person up to size 1. Reverse loading from northerly winds has formed reactive wind slabs on southwesterly slopes.

Snowpack Summary

15-30 cm of recent new snow has been redistributed by southwesterly winds shifting to north and east. This is sitting on a crust on all but northerly aspects, wind-affected surfaces in the alpine, and possibly a mixture of weak feathery surface hoar and/or sugary facets in sheltered terrain at treeline and below.Below this down 50-80 cm sits a crust that formed mid-January right to mountain top on southerly aspects and on all aspects below 1700 m. Additionally at this depth, feathery surface hoar may be found in shady sheltered areas at treeline. This surface hoar layer is reported to be most prevalent in the far southeast of the region near Manning Park.The remainder of the snowpack is generally well-settled.

Wind Slabs Wind Slabs

Likelihood

Possible

Expected Size

1 - 2

Recent new snow fell in conjunction with strong southwest wind. Expect to see wind slabs on a variety of aspects as the wind shifts to the northeast.

Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Be cautious as you transition into wind affected terrain.Watch for signs of instability such as whumpfing, or cracking.

Aspects: All aspects.

Elevations: Alpine, Treeline.

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