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Archived

Avalanche Forecast

Mar 13th, 2025–Mar 14th, 2025
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Bull, Flathead, Lizard, Lizard-Flathead.

Before entering avalanche terrain assess the bond of the new snow.

A persistent weak layer in the snow means avalanches could step down and become large.

Confidence

Moderate

Avalanche Summary

Wed/Thurs: Explosive control produced dry loose and storm slab avalanches to size 2 on north through east facing slopes. A natural size 2.5 storm slab was also observed.

Tues: A natural cycle of small (size 1 to 1.5) storm slab avalanches occurred.

Last weekend: Explosive control and natural cornice fall produced numerous slab avalanches up to size 2.

Looking forward: Storm slabs are expected to remain reactive and may step down to deeper persitstent weak layers.

Snowpack Summary

Recent snowfall of 20 to 40 cm combined with southwest winds has formed widespread and potentially reactive storm slabs. Below 1900 m and on sun-exposed slopes, the new snow rests atop a melt-freeze crust left by previous warm temperatures and sun. The snow surface may be moist or crusty at lower elevations.

A persistent weak layer of surface hoar or facets from late January is buried 90 to 150 cm. This layer triggered large avalanches earlier in March, and remains reactive in snowpack tests. The greatest concern for this weak layer lies in areas where a thick, supportive crust is absent under the new snow. The lower snowpack is generally well-settled and strong.

Weather Summary

Thursday Night

Mostly cloudy, with 1 to 5 cm of snow. 25 to 30 km/h southwest ridgetop wind. Treeline temperature -9 °C.

Friday

Partly cloudy, with trace amounts of snow possible. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -7 °C.

Saturday

Cloudy, with 5 to 10 cm of new snow. 15 to 25 km/h south ridgetop wind. Treeline temperature -5 °C.

Sunday

Cloudy, with 1 to 5 cm of snow. 15 to 35 km/h southwest ridgetop wind. Treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Be especially cautious as you transition into wind-affected terrain.

Avalanche Problems

Storm Slabs

Up to 40 cm of recent storm snow combined with southwest winds has formed widespread and reactive storm slabs. The new snow will need a few days to settle and bond.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 2

Persistent Slabs

A persistent weak layer is buried 80 to 130 cm. This layer remains a concern where there is no thick, supportive crust under the recent snow.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3