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Avalanche Forecast

Archived

Feb 4th, 2021–Feb 5th, 2021

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

Regions

Glacier.

It's another good day for conservative terrain choices. While the likelihood of triggering avalanches is slowly decreasing, the consequences remain high.

Weather Forecast

Expect light snow throughout the day, which may accumulate to 5cm. A cooling trend, with alpine temps in the minus 10 region, and moderate westerly winds. Another 5cm of snow tonight, dribs and drabs of precipitation on Friday; then another 10cm of snow through the weekend. There is general cooling trend as the jet stream has shifted to a NW flow.

Snowpack Summary

An accumulated 60+ cm of storm snow from earlier this week buries Surface Hoar, Crusts, and or Facets depending on elevation and aspect. Storm slabs remain reactive in the Alpine and exposed areas of TL. Persistent slabs are still being triggered yesterday at and below TL. Our mid and lower snowpack is quite strong, with no current concerns. 

Avalanche Summary

2 skier accidentals size 2 slab avalanches were reported yesterday. One in Teddy Bear Trees and the 2nd in Puff Daddy. Both avalanches failed on the January 24th Surface Hoar Layer, and or facets on a crust. A few "Whumphs" were also reported from the backcountry in MIN reports around TL. No new avalanches were obs in the HWY Corridor yesterday.

Confidence

Due to the number of field observations

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.