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Avalanche Forecast

Archived

Nov 30th, 2018–Dec 1st, 2018

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.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

We're working from very few observations. While dirt has reappeared at lower elevations, it is very much winter in the alpine where cornices and wind slabs may remain problematic this weekend. Please let us know what you're seeing on the MIN!

Confidence

Low - Due to the number of field observations

Weather Forecast

We are transitioning into a period of pronounced high pressure. The forecast period is marked by cooler temps, clear skies and no significant precipitation, even in the extended forecast.FRIDAY NIGHT: Freezing level around 1100 m, light southerly wind, a trace of snow possible. SATURDAY: A few clouds, freezing level around 1200 m, light northeast wind, no significant precipitation expected.SUNDAY: Clear skies, freezing level around 800 m, light northeast wind, no significant precipitation expected.MONDAY: Clear skies, freezing level around 800 m, light east wind, no significant precipitation expected.

Avalanche Summary

No avalanches have been reported. Please submit any observations you have to the Mountain Information Network here.

Snowpack Summary

Monday and Tuesday's storm produced over 200 mm of precipitation that mostly fell as rain. Winds were extreme out of the south/southwest. Cornices and wind slabs are likely widespread now.A MIN from Friday suggests that it's skiable from 1600 m on up. Between 1600 and 2000 m there is 5 to 10 cm of low density snow over a 5 cm breakable crust. Above 2000m is reportedly skiing well.  Alpine depths are approaching 175 cm.  Near the ground there is a crust/facet interface, little is known about the reactivity of this layer. It is thought that there is insufficient snow for avalanches below 1500 m.

Problems

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.

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.