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Avalanche Forecast

Archived

Apr 1st, 2023–Apr 4th, 2023

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

Regions

Long Range Mountains, Corner Brook, Gros Morne, Northern Peninsula.

New snow and wind are forming fresh, reactive slabs over a crust. Wind slabs may remain triggerable for several days after the snowfall.

Confidence

Moderate

Avalanche Summary

No recent avalanche observations.

Snowpack Summary

New snow falls amid strong wind over crusty surfaces at all elevations. Above 500 m, the semi-breakable crust caps a dry upper snowpack.

The remainder of the snowpack is composed of alternating layers of crusts and wind-hardened snow. Recent snowpack tests have produced results 40-60 cm deep on a layer of weak crystals sandwiched between two crusts. No avalanche activity has been observed on this layer and it is thought to be well-bridged by overlying crusts and dense snow.

Weather Summary

Saturday night

5-15 cm of new snow. Strong southeast wind. Alpine low temperature -3.

Sunday

Wet flurries accumulating around 3 cm. Moderate southwest wind. Alpine high temperature 0. Freezing level peaking briefly at 500 m late morning.

Monday

Snow squalls bring 5-20 cm of new snow. Strong westerly wind overnight switching to moderate northwesterly. Alpine high temperature -5.

Tuesday

Mostly cloudy with light flurries. Moderate westerly wind. Alpine high temperature -1.

The outlook for the end of the week shows a big warm up with freezing levels spiking to well over mountaintop with rain Thursday-Friday.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Keep in mind the crust offers an excellent bed surface for avalanches.
  • Avoid steep slopes when air temperatures are warm, it is raining, or solar radiation is strong.

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.