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Archived

Avalanche Forecast

Mar 17th, 2023–Mar 18th, 2023
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Use caution on steep wind-loaded slopes on Saturday. Avalanche danger will increase on Sunday with the incoming storm.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported over the past few days, but there was some evidence of old wind slab avalanches in alpine bowls.

Small wind slab avalanches are possible in isolated steep terrain on Saturday. A period of natural avalanche activity can be expected later in the day on Sunday as the incoming storm intensifies.

Snowpack Summary

A few centimetres of moist snow from the past few days sits over crusts and wind-hardened layers. Shaded areas at upper elevations may still have some dry snow on the surface. The Northern Peninsula may have deeper deposits of fresh snow. Forecasts called for 10 to 15 cm in that area over the past few days, but we do not have field observations to verify those amounts.

The snowpack is generally dense and bonded, with a few crust layers found throughout.

Weather Summary

Friday night

Partly cloudy skies, no precipitation, 20 km/h northwest wind, mountain temperatures cool to -5 °C.

Saturday

Mix of sun and cloud, no precipitation, 20 km/h northwest wind, mountain temperatures around -2 °C.

Sunday

Snowfall increasing in intensity throughout the day with 5 to 15 cm possible by the evening, chance of freezing rain, strong southeast wind with gusts to 70 km/h, mountain temperatures around -2 °C.

Monday

Heavy snowfall continues Sunday night with another 10 to 30 cm possible by the morning and flurries throughout the day bring another 5 to 15 cm by the evening, strong wind shifts to the west with gusts to 90 km/h, mountain temperatures cool to -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Avalanche Problems

Wind Slabs

Wind slabs may have formed over the past few days below ridgelines and on the sides of steep gullies. Recent weather trends suggest they will be small and isolated, but it's worth evaluating your route for wind slabs given the limited number of observations.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 1.5