Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Nov 26th, 2020–Nov 27th, 2020

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 unlikely, human triggered possible.
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.

Regions

Glacier.

Thanks to everyone for the MIN posts. Human triggered avalanches are likely in steep unsupported terrain features today, and if the sun does poke out today, give solar paths like frequent flyer a wide berth.

Weather Forecast

Another mixed bag of weather conditions today; expect, flurries with sunny breaks, southerly winds gusting to moderate, and the FL hovering near 1000m. 

Tonight: Flurries, FL 700m, mod SW winds.

Friday: 6cm of new snow, Mod-strong SW winds

Saturday: 10cm of new snow, strong SW winds

Snowpack Summary

10cm overnight + the 30cm on Tuesday evening brings our storm total to 40cm at TL; This new snow accompanied by Mod-Strong southerly winds formed storm slabs in the alpine and exposed terrain features @ TL. The Nov 5th crust complex (3-10cm thick) is now buried over 1m deep and can be found up to 2500m on all aspects; with facets above and below.

Avalanche Summary

Approximately 20 new Natural Avalanches were observed in the HWY corridor yesterday. The majority were size 1.5-2, with a couple of size 3s; Most of these slides were in very steep terrain off of Mt. Mcdonald, and Mt Tupper. No reports from the backcountry yesterday, but suspect there was some natural activity yesterday and last night.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Problems

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.

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.