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Avalanche Forecast

Archived

Apr 22nd, 2019–Apr 23rd, 2019

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

Cariboos.

New snow and moderate winds Monday night may create small wind slabs that when in motion, step-down to the recent storm snow, resulting in large avalanches.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

MONDAY NIGHT: Cloudy with flurries; 5-10 cm. / Moderate, southwesterly winds / Alpine low -3 C / Freezing level 1500 m.

TUESDAY: Cloudy with isolated flurries; 2-5 cm / Light, westerly winds / Alpine high -1 C / Freezing level 1800 m.

WEDNESDAY: Sunny / Light to moderate, westerly winds / Alpine high -2 C / Freezing level 1500 m.

THURSDAY: Mostly sunny / Light, westerly winds / Alpine high -1 C / Freezing level 1700 m.

Avalanche Summary

On Sunday, numerous solar triggered avalanches initiating below alpine ridgetops up to size 3 were reported.

Check out this MIN report of a notable human triggered size 2.5 avalanche that occurred on Saturday HERE.

On Friday, a widespread storm slab natural avalanche cycle to size 3 occurred on all aspects in the alpine. This new snow will need several days to settle and bond to the old snow surface.

Snowpack Summary

10-25 mm of rain soaked the snowpack below treeline. The rain/snow boundary on Friday was around 2000 m. Strong southwesterly winds heavily loaded lee aspects. New snow amounts in the alpine will taper rapidly with elevation and likely equate to around 10-20 cm of moist snow at upper elevations adding to the 15-40 cm recent snow which overlies a crust everywhere except high elevation, north facing terrain where preserved surface hoar (weak, feathery crystals) may be present in isolated locations down 40-60 cm. A similar layer buried in early April is down 50-80 cm. Smaller storm slab avalanches may step down to one of these deeper weak layers.

Below treeline, snow is disappearing rapidly.

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.