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Avalanche Forecast

Archived

Mar 4th, 2020–Mar 5th, 2020

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Little Yoho.

Continued snow and wind will keep the avalanche danger in the region elevated. Avoid travel in avalanche terrain.

Large avalanches from upper elevations can reach terrain below tree line.

Weather Forecast

Mainly cloudy on Thursday with another 5-10cm of snow, temp range of -16 to -4 and consistently strong SW winds. Thursday night into Friday will see another 10cm and gradually decreasing winds. Another 10cm forecasted for Saturday with cooling temps and light winds.

Snowpack Summary

30-40 cm of storm snow in the past few days brings the weekly total to ~60cm. Strong to extreme Westerly winds continue to form storm/wind slab at all elevations. Watch for buried sun crust on steep solar aspects. Generally this area has a strong snowpack, with snow depths over 300 cm in the alpine.

Avalanche Summary

Several natural storm slab avalanches up to sz 2.5 observed along highway 93S today where intense wind loading was occurring.

With continued strong to extreme winds and incoming snow in the forecast over the next few days, expect natural avalanche activity to increase.

Confidence

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

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.