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Avalanche Forecast

Archived

Mar 3rd, 2025–Mar 4th, 2025

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

Regions

Lizard-Flathead, Flathead, Lizard, Moyie.

Recent avalanche activity indicates the persistent weak layer remains triggerable.

Be especially cautious on high northerly-facing slopes, and on sunny slopes during warming.

Confidence

Moderate

Avalanche Summary

Sun: Several small skier-triggered and natual wet loose avalanches and one natural size 2 slab occurred.

Sat: Explosives control near Fernie yielded several persistent slabs sized 2 - 2.5 with crowns up to 100 cm deep.

Fri: A natural size 3 was reported in the Little Sand area - likely a persistent slab.

Thu: The field team saw several persistent slabs in Corbin.

Wed: A natural size 3 deep persistent slab was seen in the Lizard Range.

Snowpack Summary

In most areas, the snow surface is crusty or moist/wet up to 1700 m, or right to ridgetop on on sun-affected slopes. Wind-affected but dry snow still remains on high northerly slopes. A weak layer of preserved surface hoar or facets from late January is buried 80 to 130 cm deep. This weak layer was active during the warmup and remains a concern where strong surface crusts haven't formed. The lower snowpack is generally well-settled, however at least one deep persistent slab ran naturally during the warmup.

Weather Summary

Monday Night

Cloudy with 0 to 3 cm of snow. 10 - 25 km/h northeast ridgetop wind, increasing. Freezing level 1500 m falling to valley bottom. Treeline temperature low of -7 °C.

Tuesday

Mostly cloudy. 10 to 15 km/h southwest ridgetop wind. Freezing level 1600 m. Treeline temperature around -3 °C.

Wednesday

Cloudy with 5 to 10 cm of snow. 15 - 25 km/h southwest ridgetop wind. Freezing level 1500 m. Treeline temperature around -5 °C.

Thursday

Sunny. 10 - 20 km/h northeast ridgetop wind. Freezing level 1600 m. Treeline temperature around -2 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Keep in mind that human triggering may persist as natural avalanches taper off.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.