Wednesday January 15, 2020

Friday January 17, 2020
Thursday January 16, 2020
Wednesday January 15, 2020
Confidence: Moderate - Increased field observations.

Main Concerns

Persistent Slab, Wind Slab, Storm Slab - view Avalanche Problems for detailed information.

Travel & Terrain Advice

Seek sheltered and low angle terrain during the incoming storm events, ensure avoidance of overhead hazard.

Careful snow pack assessment and selective route finding is essential when entering any convex roll or steep features.

Avalanche Summary

No new avalanches observed or reported.

Avalanche Problems

Persistent Slab

Found in the alpine and on all aspects, expect this avalanche problem to be stubborn to light triggers such as skiers. The chance of these avalanches being triggered is unlikely but if triggered may produce avalanches that are large to very large, greater than size two.

Wind Slab

Touchy wind slabs can currently be found on all aspects, but predominantly south. Found in both alpine and treeline terrain, triggering of this avalanche problem is possible to likely from light loads such as skiers. If triggered expect these avalanches to be small to large, up to size two.

Storm Slab

New snowfall expected to develop during the end of the week will form new and touchy storm slab avalanches. The chance of this avalanche problem being trigger is likely to very likely ,especially during the initial storm period. Expect to find this new problem widespread and at all elevations and on all aspects. If triggered, expect avalanches to be large, size two or greater.

Snowpack Summary

Upper snow pack is variable with wind effect stripping and pressing north aspects while loading and depositing snow on south aspects. Upper snow pack in areas not effected by the wind remains low density and shows little in the way of slab properties. The past warm and wet weather has developed thick and very dense melt freeze crusts that have essentially bridged the snow pack and created a layer that is moderately reactive to testing. The lower snow pack is settled and dense, with a basal instability still present in the upper alpine.

Snowpack Details

SurfaceVariable surface conditions exist from stripped and pressed on North aspects and freshly loaded on south aspects.
UpperUp to 30 cm of low density snow and on windward aspects a stiff and dense crust.
MidA variety of melt freeze crusts can be found.
LowerDense and settled with a faceted basal instability found in isolated features the upper alpine.

Past Weather

Over the previous forecast period cool temperatures persisted with alpine temperatures dropping to the mid teens. These cool temperatures where combined with light north wind and intermittent light flurries.

Weather Forecast

A parade of winter storms are set to enter our region over the coming forecast period. The initial storms will continue to arrive cool. Fridays storm will deliver increasingly warm temperatures.

Wednesday 10-15 cm, Winds strong from the North east, Freezing levels 1000 meters.

Thursday trace 30-50 cm, Winds strong from the South west, Freezing levels 500 meters.

Friday 10-20, Winds strong from the South east, Freezing levels 500 meters.

Posted on Wednesday January 15, 2020 by Jesse Percival

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