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Avalanche Forecast

Archived

Mar 3rd, 2022–Mar 4th, 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.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Exercise extra caution on southerly aspects if the sun comes out! The Solar radiation in March can pack some punch!

Weather Forecast

We are into a cooling/drying trend after our warm wet weather from earlier this week as a High-Pressure system moves over Rogers Pass. On Friday we are expecting a mix of sun and cloud, light NE winds and the FL falling to 1300m. The same conditions are expected over the weekend, but with more sun and less cloud.

Snowpack Summary

Cooling temps Thursday evening will create a crust at lower elevations. Earlier this week at TL we received ~45cm of snow, warm temps, and strong winds creating storm slabs. The new snow overlies the Feb 26th interface which consists of surface hoar, crusts, facets, and hard wind slabs depending on aspect elevation, incline, and terrain feature.

Avalanche Summary

HWY corridor: Avalanche control on Tuesday evening produced numerous avalanches to size 3.5. We also obs several natural avalanches to size 2 in the last 48 hours.

From Wednesday in the Backcountry: Multiple reports of human-triggered avalanches to size 2 in the Connaught drainage, and a MIN report of touchy storm slabs on Glacier Crest.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

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.