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Avalanche Forecast

Archived

Apr 11th, 2022–Apr 12th, 2022

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.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

Strong wind will cause heightened avalanche danger at upper elevations. Be careful around freshly wind-loaded slopes.

Confidence

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

Weather Forecast

MONDAY NIGHT: Cloudy with isolated flurries bringing trace amounts of snow, 40-50 km/h wind from the east, treeline temperatures drop to -18 C.

TUESDAY: Mix of sun and cloud, no significant precipitation, 40-60 km/h wind from the northeast, treeline temperatures around -14 C.

WEDNESDAY: Mix of sun and cloud, no precipitation, 20 km/h wind from the east, treeline temperatures around -12 C.

THURSDAY: Mostly sunny, no precipitation, 20-30 km/h wind from the east, treeline temperatures around -10 C.

Avalanche Summary

No avalanches were reported on Sunday and reports from Saturday were limited to small dry loose avalanches in steep rocky terrain. On Friday we received some observations of an avalanche cycle that occurred during last week's storm with some very large slab avalances (up to size 3).

Snowpack Summary

10 to 50 cm of recent snow has been blown into wind slabs, first from south/southwest wind and more recently from northeast wind. Below this snow, a hard melt-freeze crust is found. In some of the snowier places in the region, you may find as much as 80 cm over this crust.

Cornices are very large and exposure to them should be minimized, especially during warm or windy weather.

Terrain and Travel

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Cornices often break further back than expected; give them a wide berth when traveling on ridgetops.

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.