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Avalanche Forecast

Archived

Apr 7th, 2018–Apr 8th, 2018

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

Regions

Glacier.

Use caution around leeward alpine and treeline features as pockets of windslab may be hidden.The best quality snow can be found on shaded aspects.

Weather Forecast

A pacific frontal system is tracking inland today bringing 10-15cm of snow to the Rogers Pass area later today and overnight.  With freezing levels reaching 1900m this could mean rain at lower elevations. Today expect overcast skies, an Alpine high of -1 deg C and Southerly winds to 20 kph. Unsettled weather is forecast for much of next week.

Snowpack Summary

A few centimeters sits on top of a sun crust on solar aspects. 15-20cm of low density powder remains on shaded aspects. Wind slabs are above treeline in lee features. 60cm of recent storm snow is settling out and appears to be bonding well on polar aspects. On solar slopes, the storm slab sits on a persistent crust.

Avalanche Summary

Thursday strong solar input contributed to a widespread natural avalanche cycle on south facing slopes. A field team directly observed a large size 2.5 Na from the Frequent Flyer path in the Connaught Creek drainage. Several large solar triggered avalanches were also observed in the highway corridor east of Rogers Pass, up to size 3.0.

Confidence

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

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.