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Avalanche Forecast

Apr 7th, 2012–Apr 8th, 2012
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: South Columbia.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

This region should remain dry from Sunday through Tuesday. Freezing levels will be around 1800 m on Sunday, with an overnight freeze expected on Sunday night. On Monday, freezing levels will go to around 2500 m and on Tuesday they may push beyond 3000 m. Little overnight freeze is expected for Monday night as high cloud will prevent the heat escaping. Winds are expected to be light southeasterly for Sunday and Monday, veering southerly on Tuesday.

Avalanche Summary

On Friday, avalanche activity was limited to mostly loose snow avalanches on south facing slopes.

Snowpack Summary

Recent snow accumulations range from 20-40 cm over the past few days. 40-80 cm of snow from the past week is sitting on a reactive weak layer over a crust. This weak layer was buried March 27th in the Interior. We've received recent reports from the field of large, destructive avalanches occurring on this layer. Remote triggering (from afar) has also been reported. This indicates the likelihood and potential sensitivity of this layer. Slopes below 1000 m continue to experience little or no overnight refreeze (recovery). The deeper early February surface hoar layers seem to have been unreactive in the short term but still remain a concern with very heavy triggers such as a cornice fall, or step down avalanches.

Avalanche Problems

Storm Slabs

Large avalanches have been running on a crust buried 50-80 cm.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 5

Loose Wet

During warm or sunny days, expect loose snow avalanches by mid-late morning.

Aspects: North, North East, East, South East.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 4