Date issued

Apr 29, 2018 - 8:00 AM

Valid until

Apr 30, 2018 - 8:00 AM

Prepared by

percy woods

Elevated spring avalanche conditions. All permit areas are closed. Great day to go to the pool!

Spring Season Conditions

Avalanche Problem 1: Loose Wet

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

Surface layers are somewhere between moist and saturated depending on elevation. Point releases can be expected throughout the day today and may gain mass becoming large slides.

Travel and Terrain Advice
  • Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.

Avalanche Problem 2: Wet Slabs

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

Wet point releases have been gaining mass and in some cases releasing moist to wet slab avalanches as they progress down slope. These slides are running full path.

Travel and Terrain Advice
  • Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.

Avalanche Problem 3: Cornices

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

Cornices are ripe and weakened by past warm weather. Avoid exposure to terrain below these large triggers.

Travel and Terrain Advice
  • Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.

Avalanche Summary

Prolonged elevated avalanche danger right now. Numerous avalanches to size 3.5 in the highway corridor from the 27-28 of April. Several slab avalanches to size 3 in the backcountry mainly on South through West aspects. These slabs initiated as point releases gathered mass and overloaded a mid pack sliding surface.

Snowpack Summary

Moist to wet surface layers are now being insulated by storm snow above 1900m. Below 1900 the surface will be super saturated now by persistent rain overnight on top of already moist surface layers.

Weather Forecast

Scattered flurries, light northeast winds and a freezing level around 1900m today. Freezing level expected to rise to 2100m Monday with some solar input.

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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