Avalanche Forecast

Kootenay Boundary

Date issued

Dec 12, 2017 - 4:25 PM

Valid until

Dec 13, 2017 - 2:00 PM

Prepared by

jmcbride

Spring-like weather means be aware of changing conditions during the day and from one aspect to another. Moist or wet snow may exist on steep, sunny slopes in the afternoon while pockets of windslab may linger near ridgecrest.

Regular season
Wednesday - December 13, 2017
Alpine

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Thursday - December 14, 2017
Alpine

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Friday - December 15, 2017
Alpine

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Avalanche Summary

There have been no reports of avalanche activity since the weekend when small loose dry avalanches were observed from skier traffic in steep terrain on Saturday. Prior to that, small wind slabs were released by a skier and explosives in alpine lee features on Friday. And on thursday, small loose wet avalanches were observed on steep south-facing slopes.

Snowpack Summary

The snow surfaces varies widely depending on aspect and elevation. On south aspects a surface crust has formed but may become moist in the afternoon on steep, sun-exposed slopes. On more northerly aspects, widespread feathery, surface hoar crystals up to 30 mm in length have been observed below treeline as well as in sheltered areas at treeline. In the alpine the surface consists of sugary, faceted snow crystals and hard, wind scoured snow. Below the surface the upper snowpack is well settled and overlies a series of late-November crusts which is now buried 20-50 cm and is 15-25 cm thick. Recent snowpack tests have produced hard, resistant compression test results within the layers of this crust. Below this layer the lower snowpack is strong and well settled.

Weather Forecast

WEDNESDAY: Mostly cloudy. Ridge wind light from the northwest. Temperature -3. Freezing level 1000 m.

THURSDAY: Mostly cloudy. Ridge wind light from the west. Temperature -5. Freezing level 700 m. Alpine inversion.

FRIDAY: Cloudy, flurries. Accumulation 5 cm. Ridge wind moderate from the southwest. Temperature -5. Freezing level 700 m.

Danger Ratings Explained

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.

Natural avalanches possible; human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

4 - High

Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.

Natural avalanches likely; human-triggered avalanches very likely.

Large avalanches in many areas; or very large avalanches in specific areas.

5 - Extreme

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

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