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Avalanche Forecast

Archived

Apr 2nd, 2018–Apr 3rd, 2018

Alpine
Natural avalanches possible, human triggered probable.
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

South Rockies.

Storm slab problems are most likely in southern parts of the region that received more snow. Slopes with new snow above a crust and slopes with deep wind-blown pockets are the most suspect.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

TUESDAY: Mix of sun and cloud with some light flurries with accumulations of 1-3 cm, moderate to strong west wind, alpine high temperatures near -8 C, freezing level up to 1000 m.WEDNESDAY: Mostly cloudy, moderate southwest wind, alpine high temperatures near -5 C, freezing level up to 1200 m.THURSDAY: Light flurries with 2-5 cm, moderate southwest wind, alpine high temperatures near -12 C, freezing level at valley bottom.

Avalanche Summary

Small natural avalanches (size 1) were reported in the new snow on Monday. Ski cutting produced similar small avalanches on wind-loaded features, and explosives triggered one size 2 wind slab avalanche on an east aspect at 2300 m. This avalanche ran on a 60 cm deep crust layer.On Saturday, a large slab avalanche was observed in a burn around treeline. The avalanche was triggered by a snowmobile on a convoluted and convex terrain feature. Check out the MIN report here for more information and photos. Other wind slabs were noted in the region on all aspects.

Snowpack Summary

Northern parts of the region received 5-10 cm on Sunday night while up to 25 cm fell in southern parts of the region. The new snow sits above old wind slabs at higher elevations and above hard crust layers at lower elevations and on sunny aspects.Numerous crusts are found around 60 to 80 cm deep up to 2200 m. At a similar depth, a layer of surface hoar is found on shaded aspects at treeline in parts of the region.The midpack is well-settled and strong. This overlies sugary facets in thin snowpack areas.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.