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Avalanche Forecast

Archived

Nov 18th, 2021–Nov 19th, 2021

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

Regions

Glacier.

Travel below treeline is exceptionally challenging with the prominent Nov 15th crust and early season hazards.

Allow some extra time to get safely back to the parking lot at the end of your day.

Weather Forecast

Friday's forecast is mainly cloudy with possible flurries, light to moderate winds from the west, and the freezing level rising to ~600m. A weak weather system will pass through Rogers Pass on Saturday, possibly bringing with it another 10cm of new snow, the freezing level should be around 800m, and strong winds from the SW.

Snowpack Summary

Yesterday at TL we dug on a SE asp @ ~2100m on Mt Fidelity. Our profile showed a height of snow of 222cm with the top 140cm being storm snow. No significant test results were obs within the storm snow at this location. The November 15th crust is widespread below 1800m, and makes travel exceptionally poor.

Avalanche Summary

No new natural or human triggered avalanches have been observed, or reported form the back country, and the HWY corridor. We registered the Howitzers today firing artillery at very steep terrain in the HWY corridor with little to no result. And for those that missed it, there was a large avalanche cycle on Sunday and Monday to size 4!

Confidence

Due to the number of field observations

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.