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Avalanche Canada jsmith, Avalanche Canada

Cariboos Avalanche Forecast

Apr 25th, 2019 4:13PM

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

Lingering wind slabs may still be reactive to human triggers; especially on lee features below alpine ridgetops.

Summary

Confidence

Low - Due to the number of field observations

Weather Forecast

THURSDAY NIGHT: Few clouds / Light, northwesterly winds / Alpine low -5 C / Freezing level 1300 m.

FRIDAY: Cloudy with isolated flurries; 0-3 cm. / Light, southwesterly winds / Alpine high -2 C / Freezing level 1700 m.

SATURDAY: Cloudy with flurries; 3-5 cm. / Moderate, northerly winds / Alpine high -4 C / Freezing level 1400 m.

SUNDAY: Sunny / Light, northwesterly winds / Alpine high 0 C / Freezing level 1600 m.

Avalanche Summary

On Wednesday, a naturally triggered size 2.5 storm slab avalanche was reported on a west aspect at 2400 m. with a crown depth of 100 cm. This avalanche may have been older than 24 hrs.

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

5-10 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

Lingering wind slabs may still be reactive to human triggers; especially on lee features below alpine ridgetops.

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

Aspects:

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

Elevations:

Alpine.

Likelihood

Possible

Expected Size

1 - 2

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.

  • Cornices become weak with daytime heating, travel early on exposed slopes.
  • A moist/wet snow surface, pinwheeling and natural avalanches all indicate a weakening snowpack.
  • Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 1.5

Valid until: Apr 26th, 2019 2:00PM