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Avalanche Forecast

Archived

Mar 1st, 2022–Mar 2nd, 2022

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

Little Yoho.

New wind slab development will be the main hazard to make decisions about on Wednesday. If winds stay elevated,  sloughing in extreme terrain will also likely occur.

Weather Forecast

5-10cm is expected overnight Tuesday into Wednesday. Temperatures will remain mild with around 1700-1800m freezing levels. We could see some rain below these elevations. Winds will be moderate, and decrease Wednesday evening. A slow cooling trend will start on Thursday and into the weekend.

Snowpack Summary

15-25cm of recent snow overlays previous surfaces which include wind effected and faceted snow and sun-crusts. The Feb 15 sun-crusts/hard slab interface is down 40-60cm. The Jan 30th surface hoar/sun crust layer is down 50-80 cm and variable in distribution and reactivity, producing moderate sudden planar to no results in snowpack tests.

Avalanche Summary

Some small spindrift avalanches were observed in extreme terrain on a flight to the Balfour Hut Tuesday that were wind driven . No other observations observed or reported.

Confidence

Freezing levels are uncertain on Wednesday

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.