Avalanche Forecast
Issued: Feb 21st, 2025 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs, Persistent Slabs and Loose Wet.
Avalanche Canada,
Avalanche Canada
Choose mellow, low consequence terrain during the storm. The heaviest snowfall is expected southwest of Terrace.
If your area gets less than 30 cm of snow, lower the danger one level.
Summary
Confidence
Moderate
Avalanche Summary
On Thursday, east of Terrace, several large (up to size 2) natural storm slab avalanches were reported in steep rocky terrain.
Looking forward to Saturday, natural and human triggered avalanches will be likely in areas that are seeing rapid loading from new snow and wind.
Snowpack Summary
By Friday morning 20 to 50 cm of recent storm snow may have fallen with southerly wind forming deeper deposits on northerly aspects. The southwest corner of the forecast area may see much more than this. Terrace is just outside of the forecasted heavy snow area, but conditions could change rapidly if the storm pushes further inland.
This recent snow will overlie a variety of surfaces including a layer of surface hoar in sheltered terrain and wind-affected snow or a sun crust in exposed terrain.
Two layers of surface hoar from January can be found in the top meter of the snowpack.
A layer of facets on top of a crust from early December is buried 100 to 200 cm deep. This layer is generally not a concern in this region.
Weather Summary
Friday Night
Cloudy with 5 to 15 cm of snow above 500 m, moderate rain below. 30 cm or more around Kitimat. 50 to 80 km/h south ridgetop wind, getting lighter further inland. Treeline temperature -1 °C.
Saturday
Cloudy with 5 to 10 cm of snow above 750 m, moderate rain below. 25 cm or more around Kitimat. 45 to 70 km/h south ridgetop wind, getting lighter further inland. Treeline temperature -2 °C.
Sunday
Cloudy with 10 to 20 cm of snow above 750 m, moderate rain below. 40 to 65 km/h southwest ridgetop wind. Treeline temperature 0 °C.
Monday
Mostly cloudy with up to 4 cm of snow above 1000 m, light rain below. 30 to 50 km/h southwest ridgetop wind. Treeline high 0 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.
- Be aware of the potential for large avalanches due to buried weak layers.
- Back off slopes as the surface becomes moist or wet with rising temperatures.
Problems
Storm Slabs
With new snow, strong winds, and warm temperatures, storm slabs will quickly become reactive anywhere that dry or moist snow starts to pile up.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
Two surface hoar layers can be found in the top metre of the snowpack in sheltered terrain. They have been unreactive recently, but rapid change due to new snow and warm temperatures may wake them up.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Wet
Wet loose avalanches will be possible where precipitation falls as rain.
Aspects: All aspects.
Elevations: Below Treeline.
Likelihood
Expected Size
Valid until: Feb 22nd, 2025 4:00PM
