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Archived

Avalanche Forecast

Mar 7th, 2021–Mar 8th, 2021
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Little Yoho.

A good freeze Sunday has settled things down at lower elevations following last week's warm up but watch for a strong solar punch on Monday.

Weather Forecast

SW winds 35-45km/h midday Sunday should diminish by noon Monday as a ridge forms over the Rockies. Trace amounts of snowfall from convective activity can be expected overnight but skies will clear as the ridge builds. Expect freezing levels to reach 1500m but, as the sun comes out, and winds diminish, expect strong solar heating in the afternoon.

Snowpack Summary

10-15 cm of new snow sits over a crust on solar aspects. Moderate SW winds are transporting this new snow at treeline ridge crests and above. Facets are present down 70-100 cm but we are getting minimal to no results in snowpack tests and not seeing avalanche activity on these layers like we are in the Banff and Kootenay regions.

Avalanche Summary

Small loose wet sluffs were observed on steep solar aspects Saturday when the sun came out. Freezing levels only reach 1500m Sunday with cloud. The ski hills reported working with only small, fresh wind slabs. Natural cornice, explosive, and some skier triggered avalanches, up to size 3, have been observed in the past week during the big warm up.

Confidence

Intensity of incoming weather systems is uncertain on Monday

Avalanche Problems

Wind Slabs

10-15 cm of recent snow is being redistributed by moderate to strong SW winds along treeline ridge crests and above. Expect soft new slabs in immediate lees. Previous strong winds created extensive wind effect in open areas and added cornice growth.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5

Loose Wet

As the sun comes out in the afternoon with the forecast light winds, expect a significant solar punch to moisten recent surface snow. This snow is already sitting on previous crusts and though small, these avalanches may run fast at far.

  • Watch for moist surface snow over crust on steeper solar aspects.
  • Use extra caution on solar slopes if the sun is shinning or if the snow is moist or wet.

Aspects: South, South West, West.

Elevations: Treeline, Below Treeline.

Likelihood: Likely

Expected Size: 1 - 1