Avalanche Forecast
Issued: Apr 4th, 2017 4:17PM
The alpine rating is Wind Slabs and Cornices.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Moderate - Forecast snowfall amounts are uncertain on Wednesday
Weather Forecast
WEDNESDAY: Mix of rain and snow, accumulation Tuesday night into Wednesday 5-15cm / Moderate south wind / Alpine temperature -2 in the north and 2 in the south / Freezing level 1500 m in the north and 1800m in the southTHURSDAY: Mix of rain or snow, accumulation 5-15cm / moderate to strong south wind / Alpine temperature -2 in the north and 3 in the south / Freezing level 1500 m in the north and 1900m in the southFRIDAY: Cloudy with isolated flurries / Light to moderate southwest wind / Alpine temperature 0 / Freezing level 1500m
Avalanche Summary
A report from Monday indicates a size 2.5 explosives controlled cornice failure stepping down to what was suspected to be a mid-February persistent weak layer in the Duffy Lake area. Another report from the same area indicates a size 3 large explosives triggered avalanche stepping down to what was suspected to be a November persistent weak layer. There was also a social media report from Sunday that describes two skier triggered wind slab avalanches in the Heart Strings area. Click here for details and photos. There have been no new avalanche reports from the Coquihalla area or south of the region in the past several days.On Wednesday, recently formed wind slabs are expected to remain reactive to human triggering. These slabs are expected to be particularly touchy where they overlie a melt-freeze crust.
Snowpack Summary
5-15cm of new snow falling at upper elevations Tuesday night into Wednesday is sitting on a widespread melt-freeze crust on all aspects and elevations except for high elevation north facing terrain. Recent strong winds from the south have formed new wind slabs in the alpine and have added load to cornices. On sun exposed slopes and at lower elevations, several crusts likely exist in the upper snowpack which are generally well bonded.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Cornices
Aspects: North, North East, East, South East, South.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 5th, 2017 2:00PM