Avalanche Forecast

Issued: Feb 22nd, 2022 4:00PM

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

Avalanche Canada rbuhler, Avalanche Canada

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Recently formed wind slabs are expected to remain reactive to human-triggering on Wednesday. In eastern parts of the region which received more recent storm snow, a more widespread storm slab problem may exist.

Summary

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack. Uncertainty is due to the limited number of field observations.

Weather Forecast

High pressure remains the dominant feature for the rest of the week. However, a disturbance is expected to move through the region late Wednesday bringing increased cloud cover, shifting winds, and a chance of flurries. 

Tuesday Night: Clear, light N wind, treeline low around -12 °C.

Wednesday: Mainly sunny with increasing cloud in the late afternoon, wind becoming strong NW, treeline high around -4 °C.

Thursday: Mainly sunny, light N wind, treeline high around +1 °C.

Friday: Sunny, light SW wind, treeline high around +2 °C.

Avalanche Summary

No new avalanches were reported on Monday. On Sunday, some small natural loose dry avalanches were observed on very steep south-facing slopes. Ski cutting was also triggering some small loose dry avalanches. 

Snowpack Summary

The weekend storm produced up to 25 cm of new snow for the North Shore Mountains and around 35-40 cm in the east of the region, most of which fell with very little wind. Strong northeast wind on Tuesday is expected to have redistributed this storm snow into reactive wind slabs.

The mid-February crust is down around 25-50 cm and exists on all aspects and elevations. There is still a fair bit of uncertainty as to how the recent storm is bonding to this crust but an observation from the North Shore suggests that it is bonding well. 

The late-January melt-freeze crust is now down around 80 cm and seems to be well bonded to the surrounding snow. The middle and lower snowpack are considered well settled and strong.

Terrain and Travel

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Closely monitor how the new snow is bonding to the crust.

Problems

Wind Slabs

An icon showing Wind Slabs

The wind is expected to shift from northeast to northwest on Wednesday and wind slab development may continue in exposed high elevation terrain.

In eastern parts of the region which received more recent storm snow, a more widespread storm slab problem may exist. 

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Feb 23rd, 2022 4:00PM