Avalanche Forecast

Issued: Nov 13th, 2020 8:00AM

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

Percy Woods,

Glacier.

Watch for soft storm slabs and sluffing on the November 5th crust. Steep solar aspects in the alpine may harbour pockets of windslab on sun crust.

Summary

Weather Forecast

Cloudy with scattered flurries and 4cm of accumulation. Alpine temps should reach -6C accompanied by S'ly winds in the 15-30kmh range. Freezing level is expected to rise to 1300m. Temperatures are forecast to cool tonight into tomorrow with continued light snowfall.

Snowpack Summary

Today's storm snow will add to the 15cm+ snow over the Nov 5th crust. At treeline the meter plus snowpack consists of a series of crusts with weaker snow between crusts. The strong Nov 5th crust reaches as high as 2500m. At upper alpine elevations last weekend's strong N'ly winds caused reverse loading of storm snow onto S'ly lee slopes.

Avalanche Summary

One size 1.5 avalanche was observed yesterday initiating off of 8812 Peak and running into the ski line of 8812 Bowl.

Confidence

Due to the number of field observations

Problems

Storm Slabs

Watch for soft storm slabs forming over the Nov 5 crust at and above treeline where wind effect may amplify their sensitivity to human triggering.

The new snow will require several days to settle and stabilize.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Wind Slabs

Last weekend's outflow wind formed small pockets of windslab on immediate lees. These sit on a firm crust to 2500m and higher on steep solar aspects.

Keep an eye out for reverse loading created by northerly winds last weekend.