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Avalanche Forecast

Archived

Feb 15th, 2015–Feb 16th, 2015

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

Regions

Little Yoho.

http://www.pc.gc.ca/apps/scond/Cond_E.asp?oID=19299&oPark=100092

While parts of the Little Yoho region are improving quickly...we are still wary about the effect of all the recent load in any areas with weak basal layers or poor storm snow interfaces. Travel cautiously until the snowpack adjusts to the new load.

Weather Forecast

Light NW winds, tree line temperatures staying below freezing, no new precipitation, and a mix of sun and clouds is the forecast for the next few days. Watch for the effects of solar heating on steep south aspects when the sun comes out.

Snowpack Summary

Recent wind slabs have formed on many different aspects at higher elevations. 60-80 cm of settled storm snow at treeline and above overlies a generally settled snowpack. Some snow pits have found facets at this storm snow interface. Isothermal snow exists at low elevations. Cooler temperatures will help with overnight crust formation.

Avalanche Summary

No new avalanches observed today in Little Yoho, but a recent natural cycle occurred East of the Divide in Banff/Yoho/Kootenay. These were mainly triggered by recent loading by N winds and sun. Click here for photos of these events. As well, a few skier triggered slides were reported over the last 3 days in the Banff/Yoho/Kootenay region.

Confidence

Due to the number of field observations

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.