Lizard-Flathead

Storm slabs formed a few days ago and remain possible to trigger.

A warm, wet storm will arrive on Sunday evening and elevate danger.

Several natural and artificially triggered size 1 to 2 storm slab avalanches have occurred daily since Thursday.

With ongoing flurries, these slabs remain possible for human triggering.

20 to 30 cm of recent snow and southwest wind have formed storm slabs. 60 cm of snow sits on a melt-freeze crust, except on high-elevation north and east-facing slopes.

A surface hoar or facet layer from late January is buried 100 to 150 cm deep on north and east aspects at treeline and above. This may re-emerge as a persistent slab problem with warming this week.

Saturday Night

Mostly cloudy with 1 to 2 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Sunday

Cloudy with 1 to 5 cm of snow in the afternoon. 50 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1500 m.

Monday

Snow transitioning to rain with 5 to 15 mm. 50 km/h southwest ridgetop winds. Treeline temperature +1 °C. Freezing level rising to 2400 m.

Tuesday

Cloudy with 5 to 15 mm of rain then partly clearing skies in the afternoon. 20 km/h southwest ridgetop winds. Treeline temperature +6 °C. Freezing level rising to 2700 m.

More details can be found in the Mountain Weather Forecast.

• Cautiously approach steep slopes that are open or sparsely treed.
• 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.