Avalanche Forecast
Issued: Mar 6th, 2023 4:00PM
The alpine rating is Wind Slabs and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeThe north winds have done it again. There's a lot of firm wind slab to navigate around out there so space your group out if you have to cross large pieces of slab covered terrain as hard slabs can deliver unwanted surprises. Seek out sheltered terrain in side valleys for the best riding.
Summary
Confidence
Moderate
Avalanche Summary
On Saturday, low elevation wind slabs were reactive to rider triggers. A size 1 was reported triggered by a sled in a MIN report from Fraser.
On Friday, our field team observed natural wind slab avalanches up to size 2 and loose snow sluffing from steep alpine terrain around the White Pass.
No new avalanches were reported on Sunday or Monday.
Snowpack Summary
Outflow winds from the north have done a real number on the surface snow scouring exposed terrain, creating waves of sastrugi in more sheltered terrain, and forming wind slabs on southerly aspects. Very sheltered terrain in side valleys to the east and west of White Pass still harbour softer snow for riding.
The middle of the snowpack is very firm and settled. There is a surface hoar layer buried 60 cm (Powder Valley, Tuthsi, Paddy Peak) to 120 cm (White Pass) deep in sheltered, mostly north facing terrain features that produced some large, human-triggered avalanches in January and February.
At the base of the snowpack large sugary crystals persist.
Weather Summary
Monday night
Temperatures will warm slightly to -14ËC brining some clouds and flurries that will deliver 2- 4 cm of new snow. Wind will continue out of the north at 15 km/h.
Tuesday
The outflow continues with mostly clear skies, winds from the north at 30 km/h, and temperatures back down to -22ËC at highway elevation.
WednesdayClear skies. Wind from the north 20 km/h gusting to 40 km/h. Temperature -21ËC.
ThursdayClear skies. Wind from the northeast 15 km/h. Temperatures -27ËC with windchill down to -39ËC.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
- Seek out sheltered terrain where new snow hasn't been wind-affected.
Problems
Wind Slabs
Northerly winds continue to transport what loose snow is left into windslabs. Older wind slabs formed over the weekend will remain triggerable due to the cold temperatures.
Aspects: South East, South, South West, West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
A weak layer of surface hoar buried about 100 cm deep produced large, widely propagating avalanches on northerly aspects in alpine terrain in January and February. Though we have not seen an avalanche on this layer in a while, keep this problem on your radar.
Aspects: North, North East, East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Mar 7th, 2023 4:00PM