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Archived

Avalanche Forecast

Mar 21st, 2025–Mar 22nd, 2025
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
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
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

Regions: Flathead, Lizard, Lizard-Flathead.

15 to 25 cm of recent snow and southwest wind have formed fresh storm slabs.

Triggering will be most likely in wind affected terrain.

Confidence

Moderate

Avalanche Summary

On Thursday, a few naturally triggered storm slabs up to size 1.5 were reported on northerly and easterly aspects at treeline and above.

Snowpack Summary

15 to 25 cm of recent snow and southwest wind have formed fresh storm slabs that may be 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

Friday night

Cloudy with 3 to 10 cm of snow. 15 to 30 km/h west ridgetop winds. Treeline temperature -5 °C. Freezing level valley bottom.

Saturday

Mix of sun and cloud with 0 to 5 cm of snow. 10 to 20 km/h west winds. Treeline temperature -4 °C. Freezing level 1600 m.

Sunday

Cloudy skies. 30 to 40 km/h southwest ridgetop winds. Treeline temperature -2 °C. Freezing level 1800 m.

Monday

Mostly cloudy. 30 to 40 km/h west ridgetop winds. Treeline temperature 3 °C. Freezing level rapidly rising to 2400 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.
  • Even brief periods of direct sun could produce natural avalanches.

Avalanche Problems

Storm Slabs

15 to 25 cm of recent snow and southwest wind have formed fresh storm slabs.

Expect strong solar radiation to increase the likelihood of triggering slabs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Loose Wet

Expect strong solar radiation to trigger small wet loose avalanches and increase the likelihood of triggering slabs.

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

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 1.5