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Avalanche Forecast

Archived

Mar 21st, 2019–Mar 22nd, 2019

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Glacier.

http://www.pc.gc.ca/apps/links/goto_e.asp?destination=The sun continues to scorch the Rogers Pass area, creating dangerous avalanche conditions in the heat of the day. Travel in avalanche terrain is not recommended.

Weather Forecast

Warm again today, with alpine temps around 6*C, light winds, and intense sunshine. Freezing levels (FZL) hover around 3200m today. Friday will be a mix of sun and clouds, FZL around 3100m, and alpine highs of 5*C. Clouds roll in on the weekend, with freezing levels dropping to 1900m and ~10cm of snow on Sunday.

Snowpack Summary

A ~40cm slab exists at alpine and tree-line elevations, while isothermal conditions are present below tree-line. Surface crusts of varying hardness are prevalent on all but true North aspects in the Alpine. A THIRD night in a row of above freezing temps at tree-line elevation has prevented a solid crust from forming at 2000m and above.

Avalanche Summary

A natural spring avalanche cycle started Sunday producing loose wet avalanches and slab avalanches to size 3. Much of the surface slabs have already avalanched. However, with no re-freeze overnight, above average temperatures, and strong solar input, the cycle will continue. A group of 4 skiers triggered a sz 2 ascending to Mt Green, on Sunday.

Confidence

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.