North Rockies

New and reactive wind slabs are forming at upper elevations on north-facing terrain.

Watch for signs of instability like whumpfing or cracking beneath your feet.

On Sunday, numerous wet loose natural avalanches occurred up to size 2.

Developing wind slabs may exist with new snow and moderate southwest winds, especially on north aspects at treeline and above. They may be reactive to rider triggers.

NOTE: Observations in this region are currently very limited.

New snowfall of up to 10 cm overlies primarily moist surface conditions. North aspects above 2200 m are still holding dry snow. Solar aspects and lower elevations will begin to develop a crust or still present as moist snow below 1500 m.

Below this, a 5 to 25 cm crust from last week's rain event is present. This is capping a moist upper snowpack.

A persistent weak layer from early March, 40 to 80 cm deep, most likely exists as surface hoar on sheltered north and east aspects in the alpine. Its distribution is variable, and there have been no substantial reports of recent avalanches, but it should still be considered when evaluating slopes.

Monday Night

Cloudy, 10 to 20 cm of new snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level falling to 1000 m.

Tuesday

Cloudy, 1 to 5 cm of new snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Wednesday

Cloudy with sunny periods and light flurries 2 to 5 cm. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Thursday

Mix of sun and cloud. 25 to 45 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

• Wind slabs are most reactive during their formation.
• Be careful as you transition into wind-affected terrain.
• Be alert to conditions that change with elevation, aspect, and exposure to wind.
• Avoid travelling on slopes below cornices.