Avalanche Forecast

Issued: Apr 23rd, 2014 8:57AM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs, Loose Wet and Deep Persistent Slabs.

esharp, Avalanche Canada

Cariboos.

This forecast was build on limited field reports. If you head out into the mountains please tell us about the conditions you found. Send your observations to forecaster@avalanche.ca

Summary

Confidence

Poor - Due to the number of field observations

Weather Forecast

Synopsis: Unsettled weather will persist throughout the forecast period .Tonight and Thursday: Sunny with cloudy periods and chances of flurries - accumulations up to 5 cm / Light southerly winds / Freezing levels 1700mFriday: Flurries / light southerly winds / Freezing levels 1800mSaturday: Flurries / Light southwesterly winds / Freezing levels 1800m

Avalanche Summary

Small slabs have been recently triggered naturally and by skiers in areas where the upper snow is moist and sits above a crust. At lower elevations and on solar aspects small to large loose wet avalanche continue to be triggered on steep slopes. Cornices collapses have been reported during periods of daytime warming. Occasionally these heavy triggers have caused large deep slab avalanches on the slopes below.

Snowpack Summary

A recent crust on all but high elevation North aspects is now buried by up to 20cm of new snow. Below this 10 to 30cm of snow overlies older melt-freeze crusts from earlier in the month. Wind slabs can be found in lee features on N and E aspects in the Alpine.Several persistent weak layers still exist in the highly variable snowpack of the region:-The mid-March sun crust/surface hoar layer down 50-80cm and the early-March crust/facet/surface hoar layer down around 80-120cm seem to be laying dormant for the time being.-The mid-February crust/facet/surface hoar combo is typically down 60 - 120cm. Direct triggering of this layer has become unlikely, however, cornice fall, a smaller avalanche in motion or prolonged warming may wake this layer up. The resulting avalanche would be very large and destructive.

Problems

Wind Slabs

Moderate winds have redistributed recent snow and wind slabs may be found in lee features on North aspects. Below 2200m these slabs may be sitting on a recent melt freeze crust.

Be cautious as you transition into wind affected terrain.>Avoid avalanche terrain during periods of rain.>

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 3

Loose Wet

A supportive melt freeze crust can be found at lower elevations. This crust could break down rapidly if the sun comes out.

Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 3

Deep Persistent Slabs

The potential for very large deep slab avalanches needs to remain on your radar. Cornice fall, warming temperatures or a smaller wet or wind slab avalanche in motion could act as triggers.

Pay attention to overhead hazards like cornices.>Be aware of the potential for very large, deep and destructive avalanches due to the presence of deeply buried persistent weak layers.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely

Expected Size

4 - 7

Valid until: Apr 24th, 2014 2:00PM