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Avalanche Forecast

Archived

Feb 9th, 2023–Feb 10th, 2023

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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard.

Pay attention to the direction of the wind as you travel through wind exposed areas – there is a lot of snow available to build wind slabs.

Confidence

Moderate

Avalanche Summary

On Tuesday and Wednesday there were reports of several explosives controlled storm slab avalanches to size 2.5 in the alpine on northerly and easterly aspects. There also reports of a few skier triggered storm snow avalanches to size 1 and 1.5.

On Monday there were reports of windslab avalanches in the alpine and tree line to size 1.5 and loose dry avalanches from steep terrain to size 1. There was also a MIN report of two size 2-2.5 cornice triggered avalanches in the alpine.

Please continue to share any observations or photos on the Mountain Information Network.

Snowpack Summary

10 to 30 cm of new snow is likely being redistributed by moderate to strong west and southwest winds. This overlies previously formed wind slabs and/or a melt-freeze crust below 1900m.

The mid-pack is consolidated in the Lizard Range with a 10-20cm thick frozen crust buried 70 to 90 cm.

Weather Summary

Thursday Night

Clear periods. Moderate southwest ridgetop wind. Treeline temperature around -6 °C.

Friday

Mainly cloudy with scattered flurries, accumulation 3-5cm. Moderate to strong southwest ridgetop wind. Treeline temperature around -4 ºC. Freezing level rising to 1300m.

Saturday

Mainly cloudy with sunny breaks. Light to moderate southwest ridgetop wind. Treeline temperature around -5 ºC. Freezing level rising to 1200m.

Sunday

Mostly cloudy. moderate west and southwest ridgetop wind. Treeline temperature around -3 °C. Freezing level around 1500m.

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.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.