Avalog
Register
Get forecast notifications
Create an account to receive email notifications when forecasts are published.
Register
Login
Archived

Avalanche Forecast

Mar 20th, 2025–Mar 21st, 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: Flathead, Lizard, Lizard-Flathead.

Forecast snow and wind are expected to form fresh storm slabs reactive to human triggers.

Triggering will be most likely in wind affected terrain.

Confidence

Moderate

Avalanche Summary

On Wednesday, numerous explosive triggered storm slabs up to size 1.5 were reported primarily on northerly aspects at treeline and above.

Snowpack Summary

Forecast snow and wind are expected to form fresh storm slabs reactive to human triggers.

60 cm of recent snow sits on a melt-freeze crust, except for high-elevation north and east-facing slopes.

A persistent weak layer of surface hoar or facets from late January is buried 100 to 150 cm. Rocky slopes with a convex shape on northerly and easterly facing aspects at treeline and above are the most likely places to trigger this layer.

The lower snowpack is generally well-settled and strong.

Weather Summary

Thursday night

Cloudy with 3 to 10 cm of snow. 20 to 30 km/h southwest ridgetop winds. Treeline temperature -7 °C. Freezing level valley bottom.

Friday

Cloudy with 5 to 15 cm of snow. 30 to 40 km/h southwest ridgetop winds. Treeline temperature -3 °C. Freezing level 1700 m.

Saturday

Mix of sun and cloud with isolated flurries, 0 to 5 cm of snow. 10 to 20 km/h west winds. Treeline temperature -5 °C. Freezing level 1500 m.

Sunday

Mostly cloudy. 20 to 30 km/h southwest ridgetop winds. Treeline temperature -3 °C. Freezing level 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.

Avalanche Problems

Storm Slabs

Forecast snow and wind are expected to form fresh storm slabs reactive to human triggers.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

A persistent weak layer of surface hoar or facets is buried 80 to 150 cm. Rocky slopes with a convex shape on northerly and easterly facing aspects at treeline and above are the most likely places to trigger this layer.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3