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Avalanche Forecast

Archived

Apr 3rd, 2018–Apr 4th, 2018

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, 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.

Regions

Lizard-Flathead.

Watch for areas where the surface snow feels stiff or slabby, especially in open wind-affected terrain.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Thursday

Weather Forecast

WEDNESDAY: Cloudy with scattered flurries, moderate west wind, freezing level up to 1400 m with alpine high temperatures near -4 C.THURSDAY: Light flurries with 10-15 cm of low density snow, moderate west wind, freezing level up to 1000 m with alpine high temperatures near -7 C.FRIDAY: Morning flurries then clearing in the afternoon, moderate west wind, freezing level up to 1500 m with alpine high temperatures near -2 C.

Avalanche Summary

Numerous small avalanches were reported in the top 10-20 cm of snow on Monday and Tuesday. They included size 1 slab avalanches in wind-affected terrain and loose dry avalanches in steep sheltered terrain. A few size 2 wind slabs were observed in alpine terrain after Sunday night's storm.On Sunday, a size 2 wind slab avalanche was triggered with explosives on a north aspect at 2100 m. On Saturday, a large storm slab avalanche (size 2.5) was triggered on a treeline feature. See this MIN post for a photo and more details.

Snowpack Summary

Roughly 15 cm of snow sits above a variety of crusts on all but high north aspects. Wind has formed isolated slabs in lee features, and in some cases snow may be poorly bonded to the crusts.There are some reports of a surface hoar layer roughly 80 cm deep on north aspects at treeline, but no recent avalanche activity on this layer. A layer of sugary facets around a crust exists near the bottom of the snowpack, but this layer has been inactive for some time.Cornices are large along ridgetops and were actively failing last week.

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.