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Avalanche Forecast

Archived

Feb 24th, 2021–Feb 25th, 2021

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

Regions

Glacier.

Don't let the sun tempt you into a bigger, bolder line than you planned for.

The new snow sits on a persistent weak layer, namely crusts, facets, and hard windslab. Let this new slab have time to bond to these old surfaces.

Weather Forecast

A weak ridge today, followed by snow tomorrow.

Today: Cloudy with sunny periods, Alp high -12*C, light SW winds

Tonight/Thurs: Snow, 20cm, Alp high -8*C, strong SW winds

Fri: Flurries, 5-10cm, Alp high -9*C, light to occasional gusting strong SW winds

Snowpack Summary

The 80mm of precip earlier in the week, extreme S'ly winds, and mild temps have created a widespread persistent slab. This sits on the Feb 14 drought interface, which is a wind crust in exposed areas near Rogers Pass, and buried windslabs/facets as you move East or West. This new slab is of most concern in wind-exposed areas in the Alpine and TL.

Avalanche Summary

Natural activity has died down in the last 24hrs with the decrease in wind and temp. Only a few avalanches were detected yesterday during daylight hours.

Monday and Tues saw a torrent of large natural and artillery-controlled avalanches to sz 4, running full path out onto valley bottom fans.

Confidence

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.

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.