Date issued

Mar 22, 2018 - 3:00 PM

Valid until

Mar 23, 2018 - 2:00 PM

Prepared by

mike.koppang

Convective flurries keep giving us little amounts of snow which is nice.  The sun may come out on Friday so pay close attention to the strength of solar radiation on more southern aspects.

Regular season
Friday - March 23, 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

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.

Saturday - March 24, 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

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.

Sunday - March 25, 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

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: Wind Slabs

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

isolated windslabs in alpine areas along ridgelines and crossloaded features. Watch for these at the entrances to runs.

Travel and Terrain Advice
  • Use caution in lee areas. Recent wind loading have created wind slabs.
  • Avoid freshly wind loaded features.

Avalanche Problem 2: Cornices

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

Overhead cornices loom along ridgelines. As daytime temps warm up, these will become weak and have potential to collapse.

Travel and Terrain Advice
  • Cornices become weak with daytime heating, so travel early on exposed slopes.
  • Pay attention to overhead hazards like cornices which could easily trigger deep slabs.

Avalanche Summary

Loose dry sluffing up to sz 1 has been the only avalanche activity in the past 24hrs. 

Snowpack Summary

Convective flurries continued overnight and throughout the day giving us another 5cm of snow.  This is the overall theme at this time of year, convective flurries giving us 5-10cm every few days.  Crusts dominate the solar aspects and make the skiing challenging while northern aspects are holding dry snow right down to the valley floor.  Pockets of windslabs should be expected along ridgelines in the alpine as well as cornices are large and looming overhead of many slopes right now.  Keep an eye on solar radiation.  If the sun comes out, solar aspects will det'r quickly!  Start earlier than normal

Weather Forecast

Winds out of the NW are forecast to increase on Friday and temperatures are also supposed to cool down back to the -10C range.  We will likely see a few cm of new snow via convective flurries also.  The sky is forecast to be a mix of sun and cloud so pay attention to the affects of solar radiation on solar aspects.

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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