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Avalanche Forecast

Archived

Apr 13th, 2023–Apr 14th, 2023

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

South Rockies, St. Mary, Bull, Elkford East, Elkford West.

Avoid steep slopes that are getting baked in the sun, and use extra caution in thin, rocky start zones.

Dynamic spring weather means that avalanche danger could change quickly.

Observe your local conditions, and let that guide your terrain choice.

Confidence

Moderate

Avalanche Summary

Avalanches from earlier in the week are being reported as visibility improves, and people venture into the backcountry after the storm. As expected, there appears to have been a widespread avalanche cycle, with numerous large (size 2) and some larger (size 3) avalanches. Mostly storm slabs in the alpine, and wet loose at treeline and below.

A few avalanches likely started as storm slabs in the alpine, or just below a ridge, picked up loose wet snow, kept moving over dirt in some places, and ran down well into treeline, covering lower elevation hiking trails or forest roads.

If you head out in the backcountry, let us know what you are seeing by submitting a report to the Mountain Information Network.

Snowpack Summary

20-30 cm of settled surface snow in the alpine. Moist or refrozen surfaces on steep, solar aspects.

Below treeline, expect to find moist or refrozen surfaces, and shrinking snowpack depths.

The mid snowpack is generally settled and strong, except in areas with snow depths less than 150 cm. In these lower snow areas, the mid-pack is likely weaker and more faceted.

The lower snowpack includes a layer of large, weak facets and/or depth hoar crystals.

Weather Summary

Unsettled and convective weather could bring brief but intense periods of snowfall. Pinpointing these localized events creates a high level of uncertainty with this weather forecast. Prepare to continually evaluate the conditions, and change plans as necessary.

Thursday Night

Mostly cloudy. Trace-2 cm of snow expected, isolated areas of 10cm. Rain/snow line between 1500 m and 1000 m. Treeline low around -7°C. Light variable ridgetop wind.

Friday

Mostly cloudy. Possible trace of snow expected. Freezing level rising to 1700 m. Treeline high around -3°C. Light southwest ridgetop wind.

Saturday

Mostly sunny. No new snow expected. Freezing level at valley bottom overnight, rising to 2000 m. Light southwest ridgetop wind.

Sunday

Cloudy. 0-5 cm of snow expected. Freezing level at 1500 m overnight, rising to 2000 m. Light southwest ridgetop wind, trending to strong at high elevations.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be alert to conditions that change with aspect and elevation.
  • Watch for unstable snow on specific terrain features, especially when the snow is moist or wet.
  • Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.

Problems

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.