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Archived

Avalanche Forecast

Nov 18th, 2021–Nov 19th, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

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

Avalanche Problems

Storm Slabs

Storm slab activity has subsided with cooling temperatures. Many of the regular early-season descents have been skied post storm with no instabilities observed. Storm slabs may still lurk in shallow areas, and or cross loaded terrain features.

  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
  • Use caution in lee and cross-loaded terrain near ridge crests.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3