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Avalanche Forecast

Archived

Apr 23rd, 2023–Apr 24th, 2023

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

Regions

South Coast Inland, Birkenhead, Duffey, South Chilcotin, Stein, Taseko.

Check for signs of wind slab instability in steep terrain at higher elevations, especially around ridgetops. Watch for signs of loose wet instability, like snow that clumps together and pinwheels down the slope.

Use good travel habits, and evaluate each slope on a case by case basis. Field observations are very limited, and we are not certain about the exact avalanche problems you could encounter on your day in the backcountry.

Confidence

Low

Avalanche Summary

There are very few field observations coming from this forecast area. Remember that a lack of avalanche reports does not necessarily mean a lack of avalanche activity. We expect that riders could trigger wind slabs in steep lee terrain features at treeline and alpine elevations.

On Sunday in the Duffey Lake area, several small (size 1), naturally triggered loose wet avalanches were reported on steep, north facing slopes.

The most recent avalanches on the facet layer described in the Snowpack Summary occurred nearly two weeks ago (e.g., this MIN).

Snowpack Summary

A dusting of dry snow covers moist snow in the alpine, and wet surfaces or frozen crusts at treeline and below. Recent snow and southwest wind have likely formed wind slabs in leeward terrain features at high elevations.

A layer of facets and a crust buried in early April is found up to 60 cm deep at treeline and alpine elevations. This layer was the culprit of many large avalanches around April 12. It is suspected that this layer may have gained strength and bonded to the rest of the snowpack, but with limited field data from this forecast area, it remains an uncertainty for us.

The base of the snowpack remains faceted and weak. There are no reports of recent avalanche activity on this layer, but the concern remains for triggering large avalanches on steep and rocky slopes with a thin snowpack.

Cornices are large and looming at this time of year.

Weather Summary

If you are wondering why the freezing line and the snow line might be so different on some days, click here for more information:)

Sunday Night

Cloudy. 2-5 cm of snow expected. Snow/rain line around 1200 m. Light southwest ridgetop wind trending to moderate at very high elevations.

Monday

Mix of sun and cloud. Possible trace of snow/rain expected. Freezing level rising to 1800 m. Treeline low around -3°C. Light southwest ridgetop wind.

Tuesday

Mostly sunny. No new snow/rain expected. Freezing level rising to 2000 m. Treeline high around -1°C. Light southwest ridgetop wind.

Wednesday

Partly cloudy. Possible trace of snow/rain expected. Freezing level rising to 2600 m. Light southwest ridgetop wind trending to strong west at very high elevations.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Pay attention to isolated alpine features as well as cross-loaded features at treeline.
  • Carefully evaluate steep lines for wind slabs.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • A moist or wet snow surface, pinwheeling and natural avalanches are all indicators of a weakening snowpack.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

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.