Avalanche Forecast

South Coast Inland

Date issued

Nov 24, 2017 - 3:56 PM

Valid until

Nov 25, 2017 - 2:00 PM

Prepared by

cgarritty

The region is split, with fresh storm slab and loose wet avalanche problems in the south of the region and a well-consolidated snowpack in the north. Saturday's danger ratings are biased to the south of the region.

Regular season
Friday - November 24, 2017
Alpine

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.

Treeline

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.

Below Treeline

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.

Saturday - November 25, 2017
Alpine

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.

Treeline

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.

Below Treeline

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.

Sunday - November 26, 2017
Alpine

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.

Treeline

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.

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 Problem 1: Storm Slabs

What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?

Fresh storm slabs recently formed on the surface in the south of the region and light new snow inputs are forecast to contribute to the problem. Storm slab danger increases with elevation. This problem is largely absent in the north of the region.

Travel and Terrain Advice
  • The new snow will require several days to settle and stabilize.
  • Use caution in lee areas. Recent snowfall mixed with wind loading has created storm slabs.

Avalanche Problem 2: Loose Wet

What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?

Continued potential for loose wet avalanches exists at lower elevations where the surface remains moist from rain and where new snow is moist. This problem is largely absent in the north of the region.

Travel and Terrain Advice
  • Be cautious of sluffing in steep terrain, particularly where the debris flows into terrain traps.
  • Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.

Avalanche Summary

No new avalanches have been reported, however new storm slabs developed at upper elevations in the south of the region over the course of Thursday's continued stormy weather. Please post your observations to the Mountain Information Network. (MIN)

Snowpack Summary

A shift from rain to snow on Thursday saw new snow accumulating above about 1300 metres in the south of the region. The depth of this new snow is heavily elevation dependant, with up to 30 cm accumulated at the highest elevations in the south of the region. The north of the region saw only a trace of new snow accumulate on the surface after the rain subsided. Below the new snow, recent heavy rain eroded snowpack depths significantly, leaving behind a rain-soaked and relatively uniform 90 cm at treeline elevations throughout the region.

Weather Forecast

Saturday: Flurries bringing approximately 5 cm of new snow. Wet flurries in the south of the region. Moderate southwest winds. Freezing level to 1800 metres with alpine temperatures around 0 in the south of the region, 1500 metres and -3 in the north.

Sunday: 15-20 mm of rain. Strong southwest winds. Freezing level ranging from 2000 to 2200 metres with alpine temperatures from +1 to +4.

Monday: Mainly cloudy with isolated flurries and a trace of new snow. Light to moderate southwest winds. Freezing level to 1300 metres with alpine temperatures around -4.

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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