Avalanche Forecast

South Coast

Date issued

Mar 30, 2018 - 4:35 PM

Valid until

Mar 31, 2018 - 2:00 PM

Prepared by

mgrist

The weather forecast calls for a mix of sun and cloud, yet relatively cool temperatures. Minimize your exposure to sunny slopes when the sun is out for extended periods.

Regular season
Saturday - March 31, 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

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 - April 1, 2018
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.

Monday - April 2, 2018
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 Problem 1: Loose Wet

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

The sun really packs a punch this time of year - that's no April Fool's joke! Limit your exposure to sunny slopes if the sun comes out in full force.

Travel and Terrain Advice
  • Avoid exposure to sunny slopes.
  • Watch for clues, like sluffing off cliffs and pinwheeling, that the snowpack is warming up.
  • Pay attention to hazards like cornices when traveling on or below ridges.

Avalanche Problem 2: Wind Slabs

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

Wind slabs may linger at higher elevations, and could be destabilized by periods of direct sunshine over the long weekend.

Travel and Terrain Advice
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
  • Be cautious as you transition into wind affected terrain.
  • Extra caution needed around cornices with current conditions.

Avalanche Summary

There is no recent notable avalanche activity to report.

Snowpack Summary

We've seen only small amounts of new snow (1-8cm) in the past two days with daytime high temperatures rising to just above freezing at tree line elevations. The end result has given us a ~3cm thick melt-freeze crust that is generally unsupportive at lower elevations (below tree line) and supportive at higher elevations (tree line), particularly in the North Shore mountains.

Alpine areas around Squamish likely received about 60-100 cm of storm snow and more wind early in the week. In these areas the storm snow is possibly sitting on a mixture of weak grains including a crust on solar aspects and potentially facets/surface hoar on polar aspects.

Below the storm snow the snowpack is generally well settled and strong.

Weather Forecast

We'll have variably sunny weather on Saturday before a weak system comes through on Sunday. Temperatures are staying cool for this time of year.

SATURDAY: Cloudy with sunny periods / Light to moderate west wind / Alpine temperature +1 / Freezing level 1500m decreasing to 1000m by noon.

SUNDAY: A mix of sun and cloud with isolated flurries / Light to moderate west wind / Alpine temperature -1 / Freezing level decreasing to 500m

MONDAY: Mix of sun and cloud / Light to moderate south wind / Alpine temperature -1 / Freezing level 500m

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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