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Avalanche Forecast

Archived

Mar 23rd, 2022–Mar 24th, 2022

Alpine
Natural avalanches possible, human triggered probable.
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.

Fresh wind slabs will be deposited on Wednesday evening as a cold front hits Rogers Pass.

Human-triggered avalanches are likely on cross loaded terrain features and lee slopes in the Alpine and exposed areas of Treeline.

Weather Forecast

Thursday's forecast is calling for a mix of sun and cloud after Wednesday's cold front passes by. Temperatures are expected to fall to -10 overnight on wednesday, with a Alpine high of -6 on Thursday. No precipitation is in the forecast until Saturday, where we could see some incremental snow.

Snowpack Summary

Recent storm snow is swiftly settling with the warm temps, and was moist on the surface up TL elevation on Tuesday. Strong wind, new snow, and above average temps will likely build fresh slabs in the Alp and exposed areas of TL on Wednesday afternoon into the overnight period. The March 11th crust is buried 40-70cm to 2000m and higher on solar asp.

Avalanche Summary

On Tuesday there were several loose wet avalanches observed in the HWY corridor, to size of 1.5. Most of them started in steep unsupported terrain at lower elevations. No new avalanches were reported from the backcountry on Wednesday or observed in the HWY corridor.

Confidence

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.

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.