Wednesday January 22, 2020

Friday January 24, 2020
Thursday January 23, 2020
Wednesday January 22, 2020
Confidence: Moderate - Fluctuating freezing levels and discrepancy within forecast models over the precipitation amounts and in what form.

Main Concerns

Loose Wet, Storm Slab - view Avalanche Problems for detailed information.

Travel & Terrain Advice

Give Cornice features a large berth when travelling both below or above them.

Choose low angle terrain during storm events and avoid areas with overhead hazard.

During periods of high hazard, travel in avalanche terrain is not recommended.

Avalanche Summary

Past 72 hours, reports of widespread natural avalanche occurrences up-to size 2 mostly loose wet. Ski cutting on short steep terrain below 1500 meters produced easly triggered loose wet avalanches that gained mass on larger slopes.

Avalanche Problems

Loose Wet

Warming temperatures and precipitation in the form of rain will unconsolidated the new snow allowing for loose wet avalanches to become very touchy to light triggers such as skiers.

Location: All aspects but specific to lower alpine elevations and below.

Possibility: During warming cycles and rain events expect triggering of this avalanche problem to be near certain from light loads such as skiers. Natural avalanches are very likely to certain.

Size: If triggered expect these avalanches to start small but when they gain mass up-to size 2. Expect terrain features that are steep and gully like to promote the loose wet avalanche problem to gain mass and speed.

Storm Slab

New snowfall and warming temperatures have begun to rapidly settle the current storm slab. Expect this problem, to be touchy to light triggers such as skiers.

Location: All aspects and at all elevations.

Possibility: Triggering of this avalanche problem is likely to very likely from light loads such as skiers. Natural avalanches are possible to likely.

Size: If triggered expect these avalanches to be large, up to size two and on specific terrain features very large, size 3.

Snowpack Summary

30 cm of recent storm snow now covers a very moist and at lower elevations unconsolidated upper snow pack.

The mid pack has a variety of melt freeze crust with one being extremely robust and having the ability to bridge the lower snow pack.

The lower snow pack is well settled and dense, with the exception of the alpine where a deep an nonreactive basal instability is possibly still lurking.

Snowpack Details

SurfaceNew moist snow
Uppermoist and settling
MidA variety of melt freeze crusts can be found.
Lowerwell settled and dense

Past Weather

Freezing levels breached the 1800 meter mark over the entire forecast region with precipitation falling in the form of rain with amounts between 30 and 50 mm. These warm temperatures and liquid inputs, settled the snow pack rapidly and a natural avalanche cycle occurred. Tuesday a cold front dropped freezing levels back down below 1000 meters and delivered up to 35 cm of new snow.

Weather Forecast

A cavalcade of winter storms will wash over our region during the coming forecast period. The southwestern flow will continue to deliver moderate precipitation and warming temperatures with fluctuating freezing levels.

Wednesday 5-10 cm, Winds moderate from the South west, Freezing levels 1000 meters.

Thursday trace 20-25 mm, Winds moderate from the South east, Freezing levels 1800 meters.

Friday 20-25 mm, Winds moderate from the South east, Freezing levels 1200 meters.

Posted on Tuesday January 21, 2020 by Jesse Percival

Past Bulletins