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Avalanche Forecast

Archived

Mar 19th, 2020–Mar 20th, 2020

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

Regions

Glacier.

The Winter Permit System is still in effect.

Rogers Pass Discovery Centre is closed. 

Daily Winter Permits are not being issued.

Annual Winter Permits are still valid. 

Weather Forecast

Another warm, sunny day is forecast for today.  Expect alpine temperatures to reach -6.  Freezing level will rise to around 1500 m.  Winds will be light from the east. Forecast scattered clouds might reduce solar warming today.

Snowpack Summary

Sun crusts have formed on slopes facing the sun. These crusts will break down with daytime warming. Open terrain treeline and above has widespread wind effect from strong weekend winds. Cool overnight temperatures are starting to facet upper snowpack. The dormant Feb 22 surface hoar and crust combo is down 90-130cm.

Avalanche Summary

No new natural avalanche activity was observed along the highway corridor yesterday.

Several small-large (up to size 2.5) loose snow avalanches occurred on solar aspects on Monday.

If you have observations of backcountry avalanches, please report them via the Avalanche Canada Mountain Information Network.

Confidence

The weather pattern is stable

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.