Avalanche Forecast

Issued: Mar 12th, 2021 4:00PM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Loose Wet and Cornices.

Avalanche Canada kdevine, Avalanche Canada

Email

Rising freezing levels and sunshine will increase the likelihood of avalanches in many areas. Avoid exposure to cornices and steep sun-exposed slopes.

Summary

Confidence

Moderate - Uncertainty is due to difficult to forecast freezing levels.

Weather Forecast

FRIDAY NIGHT - Mainly cloudy / light to moderate southwest wind / alpine low temperature near 1 / freezing level 2000 m 

SATURDAY - Mainly sunny / moderate south wind / alpine high temperature near 4 / freezing level 2300 m

SUNDAY - Snow and rain mix, 25 cm/mm / strong south wind / alpine high temperature near 0 / freezing level 1600 m in the morning, dropping to 1000 m in the afternoon

MONDAY - A mix of sun and cloud / light variable wind / alpine high temperature near -2 / freezing level 1000 m

Avalanche Summary

Rising freezing levels and sunshine will increase the likelihood of avalanches and cornice failures on Saturday. 

Snowpack Summary

Wind slabs can be found on leeward slopes at upper elevations and may remain possible to trigger. Solar aspects likely have a crust on the surface, which will become moist when exposed to sun and rising freezing levels. Soft, dry snow may still be found in sheltered, shaded areas. Massive cornices exist on ridgelines, which can act as triggers on slopes below. 

Terrain and Travel

  • Cornices become weak with daytime heating or solar exposure.
  • Cornices often break further back than expected; give them a wide berth when traveling on ridgetops.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • The more the snowpack warms-up and weakens, the more conservative you`ll want to be with your terrain selection.

Problems

Loose Wet

An icon showing Loose Wet

Warm temperatures and sunshine are expected to create prime conditions for wet loose avalanches. Solar aspects will be the most likely trigger areas, but warm temperatures could potentially cause wet loose avalanches on all aspects.

Aspects: East, South East, South, South West.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 2

Cornices

An icon showing Cornices

Cornices weaken significantly when exposed to sun and warm temperatures. When they fail, they can have enough mass to be very destructive, and they can also trigger slab avalanches on the slopes below them. 

Aspects: North, North East, East, West, North West.

Elevations: Alpine.

Likelihood

Possible - Likely

Expected Size

1 - 2

Valid until: Mar 13th, 2021 4:00PM

Login