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Archived

Avalanche Forecast

Feb 8th, 2015–Feb 9th, 2015
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Little Yoho.

Very warm temperatures have weakened the snowpack and turned it isothermal. Avalanche terrain should be avoided until cooler temperature return

Weather Forecast

Cloudy with scattered flurries forecast for Monday. Freezing levels to valley floor on Sunday night and then rising to 1800 m on Monday. Winds are light from the south-west turning to moderate west late in the day on Monday.

Snowpack Summary

60-90 cm of recent storm overlies a crust from January 30th. The recent heavy precipitation, wind and warmer temperatures have created storm slabs which will put an enormous amount of stress on the January 30th crust interface. Isothermal conditions exist at treeline and below.

Avalanche Summary

Avalanche control today in Yoho Park and Koorenay Park produced numerous avalanches up to size 3. Many of the avalanches started dry and turned wet at lower elevations. Also, evidence of a widespread cycle up to size 3.5 throughout the forecast region. Some avalanches running close to full path.

Confidence

Freezing levels are uncertain

Avalanche Problems

Storm Slabs

50 to 90 cm of storm snow lays over the Jan 30 crust interface. A weak bond exists on this interface and storm snow avalanches are very likely.

  • Minimize overhead exposure during periods of heavy loading from new snow, wind.
  • Be aware of the potential for wide propagations.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1 - 3

Loose Wet

The snowpack is very weak at treeline and below elevations due to warm temperatures and isothermal snow conditions.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 4