Avalanche Forecast
Cariboos
Snow and strong winds beginning on Friday will add to existing slabs and grow cornices at upper elevations. Sloughing and cracking around skis and sleds are signs that the new snow is bonding poorly to the old surface.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- Watch for whumpfing, hollow sounds, and shooting cracks.
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Buried weak layers exist within the snowpack and may be reactive to large triggers such as a cornice or wind slab release. Human triggering may also be possible in shallow or thin, rocky, unsupported terrain.
Travel and Terrain Advice
- Avoid steep convexities or areas with a thin or variable snowpack.
- Pay attention to overhead hazards like cornices which could easily trigger persistent slabs.
Avalanche Summary
On Wednesday a size 2, natural cornice release was reported on a southeast aspect at 1900 m in the northern part of the region.
Tuesday there was a report of a skier triggered size 1.5 soft, wind slab release (25-50 cm deep) on a northeast-facing open, treeline slope at 1900 m.
On Sunday, natural wind slab activity to size 3 was reported on south / east aspects from 1250m right up to 2400m elevation. See this MIN post for a good example of these avalanches. See also this MIN post for dramatic photos of wind effect.
On Saturday we received reports of a large avalanche running on a deeply buried weak layer with 1.5m crown and good propagation. This feature was steep open terrain below tree line on an east facing aspect.
Although deeper, persistent avalanche activity has become less frequent over the past week, light triggers in shallow rocky areas, as well as large triggers such as a cornice collapse or step down from a wind slab release, still have the potential to result in large destructive avalanches.
Snowpack Summary
20-40cm of storm snow from last week is settling into a slab in the upper snowpack. Winds have been strong from the north west through south west, creating reactive hard wind slabs (10-15 cm thick) in exposed locations on down wind features.
These accumulations overlie the old interface that was buried mid-February and consists of; a mix of older wind slabs in exposed higher elevation terrain, a sun crust on steep solar aspects, and surface hoar on sheltered slopes.
Below the snow surface, several persistent weak layers make up a complex snowpack that still remains suspect. In the top 100-150 cm of the snowpack, two surface hoar layers buried in January can be found. Expect to find at least one of these layers on all aspects and elevations.
Deeper in the snowpack (150-200 cm deep) is a facet/crust/surface hoar layer from December, most prevalent at and below tree line.
Near the base of the snowpack is a crust/facet combo, most likely to be triggered from thin spots in the alpine.
Weather Forecast
FRIDAY: Flurries. Accumulation 5-10 cm. Ridge wind moderate to strong, south. Temperature -10. Freezing level valley bottom.
SATURDAY: Mainly cloudy, light flurries increasing overnight. Accumulation trace. Ridge wind moderate, southwest. Temperature -8. Freezing level valley bottom.
SUNDAY: Flurries. Accumulation 5-10 cm. Ridge wind moderate to strong, southwest. Temperature -7. Freezing level valley bottom.
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Wind slabs can be found in many areas in the alpine as well as open areas at lower elevations. These slabs vary from soft to hard and have been reactive to human triggers.