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Archived

Avalanche Forecast

Jan 7th, 2020–Jan 8th, 2020
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Storm day!

Conservative terrain choices that avoid overhead hazard will be key for today.

Be vigilant in monitoring changing conditions!

Weather Forecast

A strong low pressure system will cross the interior today, bringing up to 40mm of precip to Rogers Pass by tomorrow.

Today: Snow, heavy at times, 16cm. Freezing levels rising to 1400m. Winds light from the south, gusting strong

Tonight: Periods of snow, 15cm. Freezing level 1000m. Winds light from the south, gusting strong

Tomorrow: Isolated flurries

Snowpack Summary

Rogers Pass has received 100mm of precip in the past week, accompanied by strong to extreme S winds. Several weaknesses can be found within the 65-90cm of snow that lays above the persistent Dec 27th layer. The mid and lower snowpack have been strengthening, but don't forget about early season weaknesses with the increased load today.

Avalanche Summary

Expect another natural avalanche cycle to begin today with increased loading from today's storm occurs. Numerous avalanches up to size 3.5 in the highway corridor were triggered both naturally and by artillery on Saturday.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

20mm of precip forecast today with gusty S winds will build new touchy storm slabs. Expect buried slabs from this past week's snow and extreme S winds. Approach all open terrain with caution. Large paths have the potential to run to valley bottom.

  • Use conservative route selection, choose moderate angled and supported terrain with low consequence.
  • Minimize overhead exposure during periods of heavy loading from new snow, wind.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 3

Persistent Slabs

Storm slabs have the potential to step down to the December 27th SH, which is now buried up to 1m deep. See the MIN report from yesterday showing reactivity BTL.

  • If triggered the storm slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3.5