Avalanche Forecast

Issued: Nov 27th, 2018 3:00PM

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

Avalanche Canada ghelgeson, Avalanche Canada

As rain turns to snow in the alpine potentially touchy storm slabs and cornices are expected to develop.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

This system has brought over 200 mm of rain to the forecast region. The storm should offer one last pulse Tuesday night. Wednesday offers the start of what looks to be a pretty significant drying trend as cold air begins to descend from the Arctic. No significant precipitation is expected for the forecast period and it looks like clear skies by the weekend.TUESDAY NIGHT: Freezing level around 1500 m, moderate to strong southwest wind, 20 to 25 mm of precipitation expected to fall as rain on all but the highest peaks. WEDNESDAY: Broken cloud cover, freezing level holding around 1500 m, light gusting moderate southwest wind, trace of precipitation possible.THURSDAY: Scattered cloud cover, freezing level around 1200 m, light northerly wind, no significant precipitation expected.FRIDAY: Scattered cloud cover, freezing level around 900 m, light variable wind, no significant precipitation expected.

Avalanche Summary

No avalanches have been reported. Please submit any observations you have to the Mountain Information Network here.

Snowpack Summary

Monday's storm produced over 200 mm of precipitation that mostly fell as rain. Winds were extreme out of the south/southwest. Cornices likely formed on many ridgelines. Terrain above 1300 m will likely receive 20 to 30 cm of snow Tuesday night which is expected to form fresh storm slabs. Alpine areas near Squamish have the most snow, with around 70 cm of settled snow on the ground. In the alpine, there may be a crust lower in the snowpack. It is thought that there is insufficient snow for avalanches below 1500 m.

Problems

Cornices

An icon showing Cornices
Large cornices are expected to form on alpine ridgelines as the wind continues to blow while temperatures cool.
Extra caution needed around cornices with current conditions.Do not travel on slopes that are exposed to cornices overhead.Stay well back from cornices when traveling on ridgelines.

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

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 2

Storm Slabs

An icon showing Storm Slabs
20 to 30 cm of snow accompanied by strong southwest wind is possible in the alpine Tuesday night.  While difficult to access with current conditions, natural and storm slab avalanches are likely Wednesday.
The new snow will likely require a day to settle and stabilize.Use caution in lee areas in the alpine, storm snow may form touchy slabs.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Likely

Expected Size

1 - 2

Valid until: Nov 28th, 2018 2:00PM

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