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Archived

Avalanche Forecast

Mar 28th, 2021–Mar 29th, 2021
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Little Yoho.

Cooler temps and lighter winds will start to lower the hazard Monday, however we are uncertain about the extent of the wind effect at treeline, and how the new snow will react to triggers in areas that saw 25+ cm. Use caution as you gather more info.

Weather Forecast

Another 10 cm of snow at treeline is forecast Sunday night with alpine winds dropping down to the moderate range and switching from SW to North. Treeline temperatures will fall to the -12 C to -18 C range overnight and stay cool on Monday. Some light flurries and light to moderate NW winds are expected on Monday.

Snowpack Summary

Up to 25 cm of snow at treeline on Sunday in some areas. New wind slabs in alpine and exposed treeline areas from strong to extreme S-SW winds. 20-50+ cm now sits over the March 19 interface of crust on solar aspects and facets on north aspects. Moist snow below 1500 m. Snowpack becoming isothermal below 1300 m.

Avalanche Summary

One natural size 2.5-3 came down the Mt Stephen path into the berm near Field. Small loose wet avalanches reported in the Field area below 1500 m. Some small wind slabs above treeline reported by local ski areas, and some sluffing in steep terrain reported on the 93N. Limited visibility in the alpine all day.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Wind Slabs

Widespread wind slab development in alpine and some exposed treeline areas is expected from strong to extreme SW winds and 10 to 35 cm of new snow. Use caution in any steep or loaded terrain until you have a sense for how reactive the new snow is.

  • Be careful with wind loaded pockets, especially in steep confined alpine terrain.
  • Use caution in lee areas. Recent wind loading have created wind slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Loose Dry

The new snow will sluff easily in steep terrain, especially in areas that received the largest amounts over the past 24 hours.

  • On steep slopes, pull over periodically or cut into a new line to manage sluffing.
  • Be careful of loose dry power sluffing in steep, confined or exposed terrain.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5