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Avalanche Forecast

Archived

Mar 21st, 2021–Mar 22nd, 2021

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

Regions

South Coast Inland.

Keep your guard up on steep and open slopes, as there is now enough fresh snow for human triggered avalanches.

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Weather Forecast

Unsettled weather will bring a mix of sun, cloud, and light flurries for the next few days.

SUNDAY NIGHT: Scattered flurries bring up to 10 cm of snow in the north of the region and 10-20 cm in the south, 30-50 km/h southwest wind, treeline temperatures drop to -6 C.

MONDAY: Clearing skies in the north while the south remains cloudy with isolated flurries, 20-30 km/h northwest wind, treeline temperatures around -5 C.

TUESDAY: Mix of sun and cloud, light west wind, treeline temperatures around -5 C.

WEDNESDAY: Cloudy with isolated flurries bringing up to 5 cm of new snow, 30-50 km/h southwest wind, freezing level climbing to 1600 m with treeline temperatures around -2 C.

Avalanche Summary

Field reports from Saturday suggest the new snow was starting to show signs of slab development in the afternoon, with a few reports of small (size 1) wind slab avalanches in alpine terrain. The addition of more snow on Sunday will likely form more widespread slabs, with the greatest concern on wind loaded slopes.

Snowpack Summary

On Monday there will be 15 cm of new snow in most parts of the region, while the Coquihalla may have closer to 25 cm. This will bring recent snowfall totals to 20-40 cm and perhaps tip the scales to finally see storm slab development. This recent snow overlies a widespread melt-freeze crust, with the exception of high elevation northerly aspects. The lower snowpack is strong and settled.

Remember that cornices along ridgelines are large at this time of year and always have the possibility of failing naturally or from the weight of a human.

Terrain and Travel

  • Be carefull around freshly wind loaded features.
  • Dial back your terrain choices if you are seeing more than 20 cm of new snow.
  • If you are increasing your exposure to avalanche terrain, do it gradually as you gather information.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.