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Avalanche Canada jsmith, Avalanche Canada

North Columbia Avalanche Forecast

Apr 26th, 2019 3:50PM

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

Last Avalanche Forecast for the season. For additional information check out our Spring Conditions page at: https://goo.gl/cpx8Dq

New snow and moderate winds from a variety of directions may form touchy wind slabs reactive to human triggers.

Summary

Confidence

Low - Forecast snowfall amounts are uncertain

Weather Forecast

FRIDAY NIGHT: Snow; 5-10 cm. / Moderate, southwesterly winds / Alpine low -8 C / Freezing level 1000 m.

SATURDAY: Snow; 10-20 cm. / Moderate, northwesterly winds / Alpine high -3 C / Freezing level 1400 m.

SUNDAY: Sunny / Light, northeasterly winds / Alpine high -2 C / Freezing level 1500 m.

MONDAY: Mix of sun and cloud / Light, northerly winds / Alpine high -2 C / Freezing level 1500 m.

Avalanche Summary

Numerous natural loose wet avalanches were reported on solar aspects on Thursday. There are currently very few professional observers submitting daily observations. Please submit your observations to the MIN. Photos of avalanches or current conditions are particularly useful.

Snowpack Summary

5-15 cm. of new snow sits on a crust everywhere except high north facing terrain. Wind slabs created by last weeks storm may still linger in lee terrain below ridgetops. A layer of surface hoar (weak, feathery crystals) in the upper snowpack could still be reactive to human triggers in isolated locations such as high elevation, north facing terrain.

Below treeline, snow is disappearing rapidly.

Problems

Wind Slabs

New snow and moderate winds from a variety of directions may form touchy wind slabs reactive to human triggers.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Pay attention to changing conditions with elevation/aspect.
  • Use small slopes without consequence to test the bond of the recent snow.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Likelihood

Very Likely - Likely

Expected Size

1 - 2.5

Loose Wet

Any appearance of the strong April sun can initiate a loose wet avalanche cycle. The likelihood of loose wet avalanches increases as temperatures warm through the day and/or if the sun comes out for a prolonged period of time.

  • Avoid terrain traps such as cliffs and gullies that increase the consequence of small avalanches.
  • A moist/wet snow surface, pinwheeling and natural avalanches all indicate a weakening snowpack.
  • Cornices become weak with daytime heating, travel early on exposed slopes.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Apr 27th, 2019 2:00PM