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Avalanche Forecast

Archived

Mar 11th, 2021–Mar 12th, 2021

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

Regions

Glacier.

The sun will be the main input today, recent new snow will be most reactive where it is preserved over a sun crust

Weather Forecast

A ridge of high pressure building from the SW will keep the park dry for the next few days but the freezing level will rise each day.

Thursday: light W wind, high of -9, freezing level 1000m

Friday: light SW wind, high -2, freezing level 1600m

Saturday: mod SW wind, high -1, freezing level 1900m

Snowpack Summary

5cm new snow Wednesday night brings the total to 20cm in the last 3 days and 48cm since Saturday. A breakable suncrust can be found down 15cm in open areas and a second crust down 25cm on all aspects to treeline, higher on solar aspects

Avalanche Summary

A skier triggered sz 1 windslab was reported from Balu Pass in a NE immediate lee and another on the Youngs Traverse on an E aspect on Wednesday. Several small loose wets were triggered by the sun on Tuesday

Confidence

Due to the number and quality of field observations

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.