Date issued

Apr 9, 2018 - 4:00 PM

Valid until

Apr 10, 2018 - 4:00 PM

Prepared by

conrad janzen

Start early to take advantage of good travel conditions and cool temperatures on Tuesday morning. We expect the hazard will rise later in the day as things warm up and the precipitation arrives.

Regular season
Monday - April 9, 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.

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.

Wednesday - April 11, 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

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: Persistent Slabs

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

Dig down to find and test the bond of the surface snow with the Mar 15 crust down 25-50 cm on steep solar aspects, bearing in mind that the bond can vary significantly with subtle changes in slope aspect, steepness or warming temperatures.

Travel and Terrain Advice
  • Be cautious with convexities and steep slopes on solar aspects.

Avalanche Problem 2: Wind Slabs

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

Recent new snow and moderate West winds have created wind slabs in immediate lees areas of the alpine that can be triggered by skiers in some locations. This problem may increase later in the day on Tuesday as more snow arrives.

Travel and Terrain Advice
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Avalanche Summary

Some loose dry sluffing in the alpine due to strong wind gusts on Monday, as well as thin touchy wind slabs in immediate lee areas at local ski hills. Explosive control at Sunshine produced one size 2 wind slab. On Sunday a size 2 wind slab was observed on a NE aspect at 2600m near Lake Louise and some loose wet sluffing out of steep solar terrain.

Snowpack Summary

Moderate west winds over the past 24 hrs have created wind effect in open areas, and wind slabs in lee areas in the alpine, On solar aspects the March 15 sun crust is down 25-50 cm and has been sensitive to skier triggering over the last week. A temperature crust is present on all aspects below 2000m and higher on solar aspects.

Weather Forecast

Tuesday will start out as a mix of sun and cloud with below freezing temperatures overnight helping with travel conditions. Some precipitation is expected to arrive Tuesday afternoon with up to 5-10 cm accompanied by strong West winds and freezing levels up to 2300m. Cooler temps and slightly drier conditions with some cloud is expected Wednesday.

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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