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Avalanche Forecast

Archived

Apr 18th, 2022–Apr 19th, 2022

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

Regions

Purcells.

Carefully evaluate for new slab development before committing to steep terrain features.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

MONDAY NIGHT: Cloudy with snowfall, accumulation 2 to 10 cm, 20 km/h southwest wind, alpine temperature -6 C, freezing level 1600 m.

TUESDAY: Mostly cloudy with snowfall, accumulation 2 to 10 cm, 20 to 40 km/h southwest wind, alpine temperature -8 C, freezing level 1500 m.

WEDNESDAY: Mix of sun and cloud with isolated flurries, accumulation 2 to 5 cm, 10 km/h southwest wind, alpine temperature -4 C, freezing level 1800 m.

THURSDAY: Cloudy with isolated flurries, accumulation 2 to 5 cm, 10 km/h southwest wind, alpine temperature -4 C, freezing level 1800 m.

Avalanche Summary

We did not receive any avalanche observations in the past few days.

Please consider posting your observations to the Mountain Information Network to supplement our data stream and help fellow recreationists.

Snowpack Summary

Around 5 to 20 cm of snow is forecast to accumulate by Tuesday, with the most expected in the west of the region. The snow will fall with southwest wind, which may form new wind slabs in lee terrain features at higher elevations. The snow will fall onto 10 to 20 cm of consolidated faceted snow over a hard melt-freeze crust on shaded slopes at higher elevations. Below the rain-snow line, rain will wet a consolidated snowpack.

Around 100 to 200 cm deep, faceted grains persist around a hard melt-freeze crust from early December. There's uncertainty on if and when this layer will wake up, but it could during the next intense or prolonged warm-up.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.