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Avalanche Forecast

Archived

Feb 22nd, 2014–Feb 23rd, 2014

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

Regions

Northwest Inland.

Check out the Forecasters Blog for more discussion on the current conditions in most regions.

Confidence

Fair - Due to the number of field observations

Weather Forecast

Synopsis: An arctic ridge of high pressure will dominate the weather pattern over the next few days resulting in cool temperatures and mainly sunny skies. Expect daytime highs around -10, dipping to -20 overnight. Winds should be moderate from the east.

Avalanche Summary

No new natural avalanches have been reported in the past couple days; however, rider or remotely triggered avalanches, whumpfing, and cracking continue to be reported throughout the region. Keep a close eye on what the sun and wind are doing over the next few days. Small weather inputs could be enough to tip the scales and increase the potential for rider triggering in specific areas (wind-loaded or sun-exposed slopes).

Snowpack Summary

The region received up to 90 cm in the western sections, tapering off as you travel further east (around 35-50 cm). This new snow overlies a variety of old surfaces including weak facets, surface hoar (more predominant at tree line and below tree line elevations), a scoured crust, wind pressed snow, or any combination of these. Whumpfing, cracking, and reports from the field indicate a very poor bond between the new snow and these old surfaces. Recent snowpack tests give easy or moderate "pops or drops" shears on this persistent weakness and show potential for wide propagation. Recent strong winds have transported some of the new snow and formed dense wind slabs on a variety of aspects in exposed terrain.

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.