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Avalanche Forecast

Archived

Apr 18th, 2023–Apr 19th, 2023

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Crowsnest North, Crowsnest South.

Dial back your terrain choices where you are finding more than 20 cm of new snow. Avoid wind loaded areas where slabs are deeper, more cohesive, and are likely reactive to human triggering.

Confidence

Low

Avalanche Summary

No new avalanches were reported in the region on Monday.

We expect backcountry users will see evidence of numerous, small, wet loose avalanches triggered by the sun on steep solar slopes.

If you have any observations from this region, let us know what you are seeing by submitting a report to the Mountain Information Network.

Snowpack Summary

In the alpine and around treeline, 5-20 cm of new snow covers a frozen crust, with moist snow below.

The mid snowpack is generally settled and strong at treeline and above.

A melt-freeze crust that was buried in mid January can be found 60 to 100 cm below the snow surface.

A weak layer of large, sugary crystals persists at the base of the snowpack. This layer has not produced recent avalanche activity in this area, but professionals continue to monitor for signs of it becoming active.

Weather Summary

Tuesday Night

Cloudy with scattered flurries, 3 cm accumulation. Light northerly ridgetop winds. Freezing levels fall to 1000 m. Treeline low around -6 °C.

Wednesday

Mainly cloudy with scattered flurries In the south of the region 3-4 cm of new snow is forecasted whereas in the north 10-20 cm could accumulate. Light northwest ridgetop wind increasing to moderate in the afternoon. Freezing levels 1400 m. Treeline high around -5 °C.

Thursday

Mainly cloudy with scattered flurries, 5 cm accumulations. Light northwest ridgetop wind. Freezing levels 1400 m. Treeline high around -5 °C.

Friday

Mix of sun and cloud with isolated flurries, trace accumulations. Light west ridgetop wind. Freezing levels rise from valley bottom to 2000 m by mid-day. Treeline high 0 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Be especially cautious as you transition into wind affected terrain.
  • Storm snow and wind is forming touchy slabs. Use caution in lee areas in the alpine and treeline.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.