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Archived

Avalanche Forecast

Apr 21st, 2022–Apr 22nd, 2022
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
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
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: Lizard-Flathead.

We are getting back into a seasonal spring trend with cool nights, warm days, and highly variable snow conditions with elevation and aspect changes. Be on the lookout for signs that suggest unstable snow.

Confidence

High - The snowpack structure is generally well understood.

Weather Forecast

THURSDAY NIGHT: Partly cloudy with no precipitation, 10 to 20 km/h southwest wind, alpine temperature -5 C.

FRIDAY: Mix of sun and cloud with no precipitation, 10 km/h west wind, alpine temperature -1 C, freezing level rising to 2100 m.

SATURDAY: Early-morning snowfall then mix of sun and cloud, accumulation 5 cm, 10 km/h northeast wind, alpine temperature 0 C, overnight freeze and daytime freezing level rising to 2200 m.

SUNDAY: Mix of sun and cloud with no precipitation, 10 km/h southwest wind, alpine temperature 1 C, overnight freeze and daytime freezing level rising to 2400 m.

Avalanche Summary

We received a report of a rider-triggered avalanche in a north-facing steep chute. The slab was 20 cm thick and reportedly ran a long distance. Otherwise a few small wet loose avalanches were observed.

Please consider posting your observations to the Mountain Information Network to supplement our data stream and help fellow recreationists.

Snowpack Summary

Around 10 to 20 cm of snow since Tuesday formed wind slabs in lee terrain features at treeline and alpine elevations. Below treeline and on sun-exposed slopes, the snowpack is moist and consolidated. At ridge top, remember that cornices are large and looming at this time of year.

The remainder of the snowpack is strong, consisting of hard snow and various melt-freeze crusts.

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.

Avalanche Problems

Wind Slabs

Small wind slabs may be found in lee terrain features. Assess for slab properties before committing to steep terrain.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Cornices

Cornices are very large and are becoming more fragile with each day of warming. Stand well back on ridges and avoid travelling beneath them during the heat of the day.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3