Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Feb 2nd, 2013–Feb 3rd, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Strong winds later in the day on Sunday, along with light snow, may cause local instabilities in lee features tomorrow and Monday.

Weather Forecast

Temperatures should drop a few degrees on Sunday, with increasing cloudiness and light snow (2-4cm) in the evening. Strong winds will pick up from the W/NW late in the day. Monday shows temp's continuing to drop slightly, with no snow and moderate winds.

Snowpack Summary

Two main layers in the upper pack are Jan 23 and Jan 6 surface hoar/ facets or suncrust down 25 & 55. Watch for wind slabs in all open areas. These may be easily triggered from thin snowpack areas in steep terrain.

Avalanche Summary

Recent cornice fall triggered several large slides to size 3 on southerly aspects on Mt Bosworth and Mt Field. Avalanche control today produced several slides to size 2-2.5 on Mt Bosworth. A size 2 skier-triggered avalanche near Katherine Lake (Dolomite Circuit area) was reported from yesterday.

Confidence

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.

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.