Bollettino valanghe

Lizard-Flathead

Nov 27 – 28, 2021Avalanche Canada
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Archiviato · scaduto 5 years ago

Pericolo valanghe

Mon
Tue
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

Give the new snow time to settle out. Expect to see hazard increase as another system rolls in Saturday night.

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    New snow Friday formed reactive slabs and may need some time to settle out. As another system rolls in Saturday night, expect to see winds pick up through the day and freezing levels start to rise both which could contribute to a more reactive snowpack.

Confidence

Low - Uncertainty is due to the limited number of field observations. Uncertainty is due to the timing, track, & intensity of the incoming weather system.

Weather Forecast

Friday night: Isolated flurries, partly cloudy with starry breaks. West-southwest winds, 25-35 km/hr. Alpine temperature low -4 C. Freezing level dropping below 1000 m.

Saturday: Mostly cloudy with isolated flurries. Southwest winds 20-50 km/hr. Alpine temperature high +1 C. Freezing level 1500 m and rising by end of day.

Sunday: Wet snow and rain, 30-50 mm. Southwest winds 35-45 gusting to 70 km/hr. Alpine temperature high +3 C. Freezing level 2500 m. 

Monday: Tapering flurries, 5-10 cm. Southwest winds 30-40 km/hr. Alpine temperature high +1 C. Freezing level 2000 m and dropping.

Avalanche Summary

A natural avalanche cycle occurred overnight Thursday-Friday, large storm slab avalanches (size 2-2.5) in alpine and upper treeline features were reported Friday morning. Through the day, explosives triggered large (size 2) storm slab avalanches.

Snowpack Summary

30-50 cm fresh snow through Friday covered a variety of pressed surfaces and a supportive supportive mid-November rain crust. The snowpack is drying out from the mid-November rain event, but moist snow is still found below the crust and to the ground.

Snowpack depths range from 40-70 cm at treeline elevations. Expect to find a deeper snowpack at higher elevations and in wind-loaded areas. Snowpack depths decrease rapidly below 1500 m.

Early season hazards are very real right now, be wary of thin/shallow snowpacks, rocks, stumps, creeks, and other sharks hidden under fresh snow.

Terrain and Travel

  • Be alert to conditions that change with elevation and wind exposure.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Make observations and assess conditions continually as you travel.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.

Regioni coperte