Avalanche Forecast

Issued: Apr 13th, 2021 4:00PM

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

Deryl Kelly,

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Forecast reflects the highest probable hazard for the day.

Expect varied conditions depending on aspect and elevation. Early starts and finishes to the day is still the best way to avoid the highest hazard period.

Summary

Weather Forecast

A wonderful blocking ridge over Northern BC and Alberta will cycle the first real kiss of spring conditions into the whole region, including the Icefields Parkway. Positive daytime temperatures, light winds, strong solar and rising freezing levels to as high as 2500m can be expected daily, and for the near future.

Snowpack Summary

Varied surface conditions though the region. In the Icefields, the mid-pack is firm and bridging a weaker, lower snowpack. Shallow regions like Maligne, and all BTL locations are susceptible to wide, diurnal temperature swings (up to ~30 degree temp. difference), making for extremely weak, wet, hazardous conditions, especially on any solar aspects.

Avalanche Summary

A few cornice failures in the Whistlers area observed pulling deeper slabs. One notable, large avalanche running to ground off the north face of Manx Peak. These are good reminders that large slab avalanches up to size 3 are still occurring within the bulletin region from the alpine, traveling well into TL and BTL terrain with momentum.

Confidence

Problems

Loose Wet

An icon showing Loose Wet

Keep an eye out for rising temperatures and strong solar radiation. Start early and finish early to avoid the highest hazard period, early afternoon through to dark.

  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
  • Use extra caution on solar slopes or if the snow is moist or wet.

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

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 2

Cornices

An icon showing Cornices

Cornices will wake up with increasing temperatures, solar radiation and, will likely trigger deeper instabilities on the slope below. If you must travel near or below cornices, use good travel techniques and group management to reduce your exposure.

  • Pay attention to overhead hazards like cornices which could easily trigger persistent slabs.
  • Cornices become weak with daytime heating, so travel early on exposed slopes.

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1.5 - 3.5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

Forecasters are noting an increase in activity; seeing many larger slides, stepping down to ground or ice. Shallow snowpack areas would have the increased potential for human triggering.

  • Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

2 - 3.5

Valid until: Apr 14th, 2021 4:00PM