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Avalanche Forecast

Archived

Dec 7th, 2018–Dec 8th, 2018

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

Regions

Glacier.

Always exercise safe back country travel techniques even when the hazard is low. Many early season hazards exist at all elevations.

Weather Forecast

Cold temperatures, light winds and a mix of sun and cloud can be expected today. The alpine may reach -10 deg today and hopefully an inversion will settle in tomorrow morning. The next storm is forecasted to reach Rogers Pass on Sunday evening, Models predict 10cm of new snow and another 10cm to fall on Tuesday.

Snowpack Summary

The Height of snow at Mt Fidelity is just below average for this time of year, see the graphs that are hyper linked here for more info. The main layer of concern is the November 21st surface hoar, which is buried beneath 25 to 40cm of storm snow. This layer is is most likely to be triggered on steep solar aspects, where sun crusts exist.

Avalanche Summary

No new natural avalanches have been observed in the Highway Corridor or reported from the Backcountry in the last four days. Guests have been testing steep unsupported features on many aspects without any reactivity from the snowpack, except some sluffing.

Confidence

Due to the number of field observations

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.