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Avalanche Forecast

Archived

Nov 23rd, 2013–Nov 24th, 2013

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.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

The Winter Permit System comes into effect on Tuesday, November 26th. Click here: Winter Permit Information, for further info.

Weather Forecast

Freezing levels will to rise to 1800 m today, with 0 deg temps for the Alpine and an inversion setting up. Ridge top winds will be light with no snow in the forecast. Similar weather is forecast for the park tomorrow, with gusting winds to 55 km/h. This stable weather pattern, with no precipitation, will continues through the forecast.

Snowpack Summary

Last week's storm snow is continuing to settle. The November 12th surface hoar layer is buried between 50 and 110cm. Its distribution is valley dependant. It had been observed up to 2500m on Mt Abbott in the Asulkan Valley possibly explaining the occurrence of large natural avalanches to size 3.5 running off the Dome.

Avalanche Summary

Solar induced slides on south through west facing slopes are possible today if the sun stays out this afternoon. Rock outcrops and trees can be trigger points. Use caution in this terrain, especially if the surface snow starts getting moist. No new natural avalanches have been observed in the last 4 days along the highway corridor.

Confidence

Due to the number of field observations

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.

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.