Avalanche Forecast Kootenay Boundary

Date Issued: Valid Until:

Avalanche Canada jsmith, Avalanche Canada

Avalanche Forecast

Wed Apr. 24th ยท 3:37PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
Loose Wet Loose Wet
Wet Slabs Wet Slabs

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low

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.

Confidence

Low - Due to the number of field observations

Weather Forecast

WEDNESDAY NIGHT: Clear / Light, northwesterly winds / Alpine low -2 C / Freezing level 2000 m.

THURSDAY: Sunny / Light, southwesterly winds / Alpine high 6 C / Freezing level 2200 m.

FRIDAY: Cloudy with isolated alpine flurries; 1-3 cm / Light, westerly winds / Alpine high 6 C / Freezing level 2300 m.

SATURDAY: Cloudy with isolated alpine flurries; 1-3 cm / Moderate, southwesterly winds / Alpine high 2 C / Freezing level 1800 m.

Avalanche Summary

No new avalanches were reported in this region on Tuesday. However, there are currently no professional observers submitting daily observations. Please submit your observations to the MIN. Photos of avalanches or current conditions are particularly useful.

On Saturday, natural and skier triggered loose wet avalanches to size 1.5 were reported on all aspects at treeline and above.

Snowpack Summary

Rain to mountain-tops last week night soaked 20-40 cm of recent snow and initiated a loose wet avalanche cycle at treeline and above on Friday. Below treeline, the snow is isothermal (0 C throughout the snowpack) and disappearing rapidly.

As temperatures cool, we will enter a diurnal cycle during which the hazard will be low in the mornings, if there was a strong overnight freeze, and elevate throughout the day depending on warming and solar radiation. Hazard ratings are for the peak hazard expected during each day.

Problems

Loose Wet

Loose Wet

If temperatures remain warm and the solar radiation is strong, loose wet avalanches in steep terrain are likely.

  • Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.
  • A moist/wet snow surface, pinwheeling and natural avalanches all indicate a weakening snowpack.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2
Wet Slabs

Wet Slabs

If temperatures remain warm and the solar radiation is strong, wet slabs releasing on crust layers are still possible.

  • Pay attention to changing conditions with elevation/aspect.
  • If the snow is wet, mushy, or feeling bottomless, its time to go home.
  • Cornices become weak with daytime heating, travel early on exposed slopes.

Aspects: East, South East, South, South West, West.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2