Avalanche Forecast

South Coast

Date issued

Apr 8, 2018 - 3:25 PM

Valid until

Apr 9, 2018 - 2:00 PM

Prepared by

mconlan

Expect changing weather on Monday: light precipitation in the morning, increasing freezing levels, and afternoon sun breaks. These will weaken the snow surface over the day. Observe for signs of instability before travelling into avalanche terrain.

Regular season
Sunday - April 8, 2018
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.

Monday - April 9, 2018
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.

Tuesday - April 10, 2018
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?

Recent snowfall at higher elevations has formed slabs.Observe for the bond of new snow with the old surface before committing into avalanche terrain.

Travel and Terrain Advice
  • Observe for signs of instability, such as cracking and avalanche activity.
  • Use ridges or ribs to avoid pockets of wind-loaded snow.
  • Pay attention to overhead hazards like cornices, which could trigger slabs on slopes below.

Avalanche Problem 2: Loose Wet

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

Rain in the morning and warming temperatures and sunny patches in the afternoon could rapidly weaken the snow surface. Watch out for terrain traps such as gullies or above cliffs, where small avalanches can build and have severe consequences.

Travel and Terrain Advice
  • Use extra caution on slopes if the snow is moist or wet.
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Avalanche Summary

We have received very little information on avalanche activity for this region. From the little we have heard, it was generally easy to initiate large wet loose avalanche in steep terrain below treeline on the weekend.

We would very much appreciate it if you spend a moment to submit any observations you have to the Mountain Information Network here, even if it is just a photo. Thanks!

Snowpack Summary

Around 40 to 100 mm of rain fell on the snowpack up to around treeline between Thursday and Sunday, with precipitation as snow at alpine elevations and possible at treeline too. In higher terrain, snowfall has created new storm slabs. This snow overlies a thick crust in most areas except for possibly shady aspects in alpine terrain. The snowpack below the crust is generally strong.

Below treeline and possibly treeline elevations, a spring snowpack exists. The rain saturated and weakened the upper snowpack. The wet snow may freeze at higher elevations with cool temperatures. The mid and lower snowpack are strong.

Weather Forecast

MONDAY: Mostly cloudy with light precipitation in the morning and afternoon clearing, light southerly winds, treeline temperature 1 C, freezing level 1500 m rising to 2500 m by the late afternoon.

TUESDAY: Mostly cloudy with afternoon rain, accumulation 20 mm, strong southerly winds, treeline temperature 4 C, freezing level 2600 m dropping to 1500 m over the day.

WEDNESDAY: Mostly cloudy with light precipitation, accumulation 15 mm rain at lower elevations and 15 cm snow at higher elevations, light southerly winds, treeline temperature 0 C, freezing level 1400 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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