Avalanche Forecast

Issued: Mar 6th, 2023 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is below threshold. Known problems include Wind Slabs and Persistent Slabs.

Avalanche Canada jminifie, Avalanche Canada

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The 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 -14˚C 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 -22˚C at highway elevation.

Wednesday

Clear skies. Wind from the north 20 km/h gusting to 40 km/h. Temperature -21˚C.

Thursday

Clear skies. Wind from the northeast 15 km/h. Temperatures -27˚C with windchill down to -39˚C.

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

An icon showing 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

Likely

Expected Size

1 - 2

Persistent Slabs

An icon showing 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

Unlikely

Expected Size

2 - 3

Valid until: Mar 7th, 2023 4:00PM