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Avalanche Canada swerner, Avalanche Canada

South Coast Inland Avalanche Forecast

Apr 24th, 2019 4:10PM

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

Wind slabs at higher elevations may be reactive to human triggers especially where a wintry snowpack exists.

Summary

Confidence

Low - Due to the number of field observations

Weather Forecast

THURSDAY: Mainly cloudy with light precipitation. Alpine temperatures near -4 and freezing levels 2000 m. Ridgetop winds moderate from the southwest.

FRIDAY: Mix of sun and cloud with isolated flurries. Alpine temperatures near -3 and freezing levels 1400 m. Ridgetop wind moderate from the West.

SATURDAY: Cloudy with sunny periods. Alpine temperatures near -6 and freezing levels 1600 m. Ridgetop wind moderate to strong from the West.

Avalanche Summary

No new avalanches reported on Wednesday.

If you have any recent observations during your travels, we would greatly appreciate it. If you posted a photo or any other information to the Mountain Information Network (MIN), thanks!

Snowpack Summary

In the alpine, up to 10 cm cold wind-affected snow is holding onto northerly aspects. Southerly winds have produced isolated wind slabs around ridges and in the immediate lee features at upper elevations. Cornices have been failing recently.

Recent precipitation fell as rain upwards of 1800 m which has re-frozen as a crust well into the alpine on southerly aspects and all aspects below. Warm overnight temperatures will prevent crust recovery as you lose elevation. Expect thin surface crusts to break down quickly with daytime warming and rain.

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Possible

Expected Size

1 - 2

South-southwesterly winds have produced isolated pockets of wind slab around ridges and in the immediate lee of slopes. Cornices may be touchy, give them plenty of space.

  • Be careful with wind-loaded pockets, especially near ridge crests.
  • Cornices may be touchy and could trigger wind slabs on slopes below.
  • Watch for signs of instability such as whumpfing, or cracking.

Aspects:

North, North East, East.

Elevations:

Alpine, Treeline.

Loose Wet

An icon showing Loose Wet

Likelihood

Possible

Expected Size

1 - 2

Rising freezing levels and rain at lower elevations may initiate loose wet avalanches.

  • Use extra caution on slopes if the snow is moist or wet, especially at lower elevations.
  • Use caution above terrain traps like gullies where small avalanches may have severe consequences.

Aspects:

East, South East, South, South West, West.

Elevations:

Alpine, Treeline.

Valid until: Apr 25th, 2019 2:00PM