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Avalanche Forecast

Archived

Mar 15th, 2015–Mar 16th, 2015

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

Watch out for cornices above you while traveling and wind slabs in the immediate lee of ridge line features and cross wind affected features at TL and above.  Pay particular attention to solar slopes where crusts may have recently been buried. PJ

Weather Forecast

A Warm Front will approach the southern Rockies today. Precipitation associated with the Front will spread into regions near the Canada-USA boarder later this afternoon and will have up slope component to the behavior of the system. Precipitation will continue tonight and through most of Monday before the Front weakens on Monday evening.

Snowpack Summary

Strong SW'ly winds have stripped windward slopes and deposited the 5-10 cm's of new snow onto leeward aspects (north through easterly slopes).  Wind slabs up to 30cm's have been observed at TL and Alpine locations.  The mid pack and base of the snowpack is well settled and well bonded overall.

Avalanche Summary

The interfaces that were buried with this recent storm, particularly on the south aspects - should be treated with respect and caution.  No natural avalanches have been reported recently.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Monday

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.