Archived

Avalanche Forecast

Apr 2nd, 2014–Apr 3rd, 2014

Alpine

3: Considerable

The avalanche danger rating in the alpine will be considerable

Treeline

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

2: Moderate

The avalanche danger rating below treeline will be moderate

Alpine

4: High

The avalanche danger rating in the alpine will be high

Treeline

4: High

The avalanche danger rating at treeline will be high

Below Treeline

3: Considerable

The avalanche danger rating below treeline will be considerable

Alpine

3: Considerable

The avalanche danger rating in the alpine will be considerable

Treeline

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

3: Considerable

The avalanche danger rating below treeline will be considerable

Regions: South Coast.

Avalanche hazard will likely increase throughout the day, be sure your plans allow for a safe retreat from the mountains.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Synopsis: The front breaks down Wednesday night opening the door to zonal flow. A series of weak disturbances should deliver daily precipitation through the weekend.Thursday: Freezing Level: 1000m - 1700m; Precipitation: 1:6mm - 1:10cm; Wind: Treeline: Light, S | Ridgetop: Strong, SWThursday Night: Precipitation: 1:8mm - 1:15cmFriday: Freezing Level: 1100m - 1700m; Precipitation: 1:5mm - 1:10cm; Wind: Treeline: Moderate, SW | Ridgetop: Strong, SWFriday Night: Precipitation: 1:5mm - 1:10cmSaturday: Freezing Level: 1300m - 1900m; Precipitation: 1:6mm - 1:10cm; Wind: Treeline: Light, SW | Ridgetop: Strong, SW

Avalanche Summary

Natural avalanches ran to size 2.5 on solar aspects Tuesday in the form of small loose sluffs and bigger slabs, 20 - 30 cm in depth.In the neighboring Sea to Sky region warming temps induced cornice fall Tuesday. A notable event occurred on a NE facing slope at 2100m when a falling chunk of cornice triggered a small slab immediately below the ridge. The avalanche in motion stepped down to what was likely the late March crust resulting in a size 2.5 avalanche.

Snowpack Summary

The snow surface is a mix of surface hoar and melt freeze crusts.Recent warm temperatures have helped to settle and strengthen the upper snowpack. Down 30 - 50 cm below the surface, snowpack tests are still producing results on the late March crust.The persistent weak layers from early March and early February continue to be a concern. The March melt-freeze crust/surface hoar is reported to be down 60 - 100cm. The February crust/facet/surface hoar layer is now deeply buried down 150 - 250cm.The lower snowpack is strong and well settled.

Avalanche Problems

Storm Slabs

New snow accompanied by strong wind should result in new slabs being formed on top of surface hoar and crusts by mid afternoon. I expect these touchy slabs will become more and more problematic as the day goes on.

Minimize exposure to overhead avalanche terrain, large avalanches may reach run out zones.>Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.>Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 4

Deep Persistent Slabs

Three buried weak layers exist in the snowpack. These weak layers could be activated by cornice fall, a smaller surface avalanche in motion, or a rider finding the sweet spot, which would be most likely in steep rocky terrain.

Be aware of thin areas that may propogate to deeper instabilites.>Extra caution needed around cornices with current conditions.>Be aware of the potential for large, deep avalanches due to the presence of buried facets and surface hoar.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 3 - 7