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Avalanche Forecast

Archived

Jan 31st, 2015–Feb 1st, 2015

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 possible, human triggered probable.
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 unlikely, human triggered possible.

Regions

Glacier.

Keep your eyes out for wind affected areas where the new snow has formed wind slab.

Weather Forecast

Today will be dry with a mix of sun and clouds. Tomorrow we will start to feel the effects of a deep low in the Gulf of Alaska with snowfall beginning Sunday morning and up to 30cm of snow expected by Tuesday. Freezing levels should stay around 1000m with moderate to strong SW ridgetop winds. A short lived high pressure will build again on Tuesday.

Snowpack Summary

Up to 20 cm of snow with mostly light south winds overnight has buried the January 30 crust which can be found up to 2400m. Surface hoar was found on the crust and just below it the snow has become weak and faceted. The Jan15 surface hoar layer down 60-90cm and is more stubborn to trigger. The Dec 17 surface hoar/ crust complex is down 130-180cm.

Avalanche Summary

No avalanches were observed yesterday, but small cycles have been occurring on steep S-SW aspects around exposed rocks and cliff areas during warm sunny periods in the past few days.

Confidence

Forecast snowfall amounts are uncertain on Saturday

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.