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Avalanche Forecast

Archived

Mar 18th, 2025–Mar 19th, 2025

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Banff Yoho Kootenay, Banff, East Side 93N, Kootenay, Lake Louise, LLSA, Sunshine, West Side 93N, Field.

Mt. Field, Mt Dennis and Mt. Stephen avalanche closure zones are CLOSED on Wednesday, March 19th.

The sun is forecast to come out on Wednesday and this might be enough to increase the danger to HIGH. Don't expose yourself to avalanche terrain, especially if the sun is out and warming the slopes!

Confidence

Moderate

Avalanche Summary

A group digging a snowpit in low angle terrain with no overhead exposure on Observation Peak today felt a whumph that remote triggered 5-6 avalanches up to size 2.5 in the cirque around them. This remote trigger with large propagation highlights the dangerous snowpack conditions we are currently in.

Additionally, we have seen widespread avalanche activity over the last 10 days, including a fatality in the region on Friday.

Snowpack Summary

Over the past 10 days, 40-90 cm of new snow has accumulated and settled into a slab, with the deepest amounts found in the Bow Summit area and along the Wapta. This sits on a very weak, faceted mid and lower snowpack and fails easily in snowpack tests. This condition will be slow to stabilize.

Weather Summary

A ridge of high pressure is over us and will bring sun on Wednesday. Temperatures will remain seasonal, between (-1 and -10) except in the direct sun where it will warm up fast. Alpine winds will be moderate from the SW.

On Thursday, a series of systems start to move in bringing light snow. Friday we should see a bigger system with 5-10 cm forecast by Saturday AM.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Remote triggering is a big concern, be aware of the potential for wide propagations and large, destructive avalanches at all elevations.
  • Loose avalanches may step down to deeper layers, resulting in larger avalanches.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.