Avalanche Forecast
Issued: Dec 26th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Loose Wet and Storm Slabs.
lbaker,
Avalanche Canada
The next storm arrives Monday night and brings with it an additional 15 - 25 mm of precipitation and strong southerly winds. These conditions will continue to build thick storm slabs at higher elevations.
Freezing levels fluctuate between 1000 and 1500 m. Below the freezing line, wet loose avalanches remain reactive to natural and human triggering.
Summary
Confidence
Avalanche Summary
On Sunday, several natural wet loose avalanches up to size 2.5 were reported from 1800 m and below the Coquihalla highway corridor. A size 2.5 natural storm slab avalanche was observed on an east aspect in the alpine. Backcountry users should expect to see continued evidence of the weekend's natural avalanche cycle.
Please continue to post your observations and photos to the Mountain Information Network.
Snowpack Summary
In the alpine 20 - 40 cm of snow and variable southerly winds have built cohesive slabs in lees. Below treeline rain soaked the snowpack and created a rain crust.
At the start of the storm, fresh snow covered a layer of facetted and unconsolidated snow that formed during the recent cold weather. The snowpack was well settled and bonding well. Snowpack depths reach 200 cm at treeline and higher.
Weather Summary
Monday Night
Cloudy skies. A brief break between storms ends early evening as scattered flurries start up again, 10-15 cm accumulation. Ridgeline low temperature 0 C. Southerly winds 25-40 km/hr. Freezing levels 1200 m.
Tuesday
Cloudy with scattered flurries, 5 cm accumulation. Ridgetop high temperature +3 C. Southerly wind 40 - 60 km/h weakening in the afternoon. Freezing levels rise to 1500m during the day before falling to 1000 m overnight.
WednesdayCloudy with scattered flurries, 5 cm accumulation. Ridgetop high temperature 0 C. Westerley winds 20 km/hr. Freezing levels 800-1000 m.
ThursdayCloudy with scattered flurries, trace accumulation. Ridgeline high temperature -2 C. Southerly wind 20 km/h weakening in the afternoon. Freezing levels 500-1000 m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Be alert to conditions that change with aspect and elevation.
- The more the snow feels like a slurpy, the more likely loose wet avalanches will become.
- Continue to make conservative terrain choices while the storm snow settles and stabilizes.
Problems
Loose Wet
Freezing levels are fluctuating around 1500m. Below the freezing line expect to find a sloppy, saturated snowpack. Watch for unstable snow on specific features, when snow is moist or wet. This problem will persist until the snowpack is frozen again.
Aspects: All aspects.
Elevations: Below Treeline.
Likelihood
Expected Size
Storm Slabs
Southerly winds have redistributed 20-40 cm of new snow into deep pockets at higher elevations. Where snow remained dry expect to find pockets of storm slabs that remain reactive to human-triggering. Be especially cautious transitioning into wind-loaded terrain, more reactive deposits lurk in leeward features.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 27th, 2022 4:00PM
