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Archived

Avalanche Forecast

Mar 23rd, 2022–Mar 24th, 2022
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
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.

Fresh wind slabs will be deposited on Wednesday evening as a cold front hits Rogers Pass.

Human-triggered avalanches are likely on cross loaded terrain features and lee slopes in the Alpine and exposed areas of Treeline.

Weather Forecast

Thursday's forecast is calling for a mix of sun and cloud after Wednesday's cold front passes by. Temperatures are expected to fall to -10 overnight on wednesday, with a Alpine high of -6 on Thursday. No precipitation is in the forecast until Saturday, where we could see some incremental snow.

Snowpack Summary

Recent storm snow is swiftly settling with the warm temps, and was moist on the surface up TL elevation on Tuesday. Strong wind, new snow, and above average temps will likely build fresh slabs in the Alp and exposed areas of TL on Wednesday afternoon into the overnight period. The March 11th crust is buried 40-70cm to 2000m and higher on solar asp.

Avalanche Summary

On Tuesday there were several loose wet avalanches observed in the HWY corridor, to size of 1.5. Most of them started in steep unsupported terrain at lower elevations. No new avalanches were reported from the backcountry on Wednesday or observed in the HWY corridor.

Confidence

Avalanche Problems

Wind Slabs

Approximately 10-20cm of new snow is forecasted to fall on Wednesday, coupled with strong south-westerly wind, and warm temperatures. Expect new wind slabs on exposed terrain features in the Alpine and exposed areas of TL.

  • Watch for surface cracking and stiffer surface layers of snow.
  • Use caution in lee and cross-loaded terrain near ridge crests.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Persistent Slabs

While avalanche activity on this layer is tapering off in Rogers Pass, human-triggered avalanches are still possible, especially on steep solar aspects. Our neighbors West of Rogers Pass continue to witness activity on this layer.

  • Evaluate terrain features by digging and testing on adjacent, safe slopes.
  • Convex features and steep unsupported slopes on solar aspects will be most prone to triggering.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5