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Archived

Avalanche Forecast

Jan 26th, 2024–Jan 27th, 2024
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Avalanche hazard may rise quickly with warming temps and increased wind.

Be prepared to dial back your objective quickly if there are obvious signs of wind transport at ridgetop, or if the forecast freezing levels (1600m) are exceeded.

Confidence

Moderate

Avalanche Summary

Avalanche control just West of the park produced a size 3 storm slab avalanche in a large Southerly feature on Friday.

We observed isolated naturals in the highway corridor over last few days, triggered by southerly winds at upper elevations, and high freezing levels in valley bottom avalanche paths.

Riders have been triggering isolated small slabs this week in the moistening snow on steep features below treeline. These were failing down 30-40 cm on the Jan 3 crust.

Snowpack Summary

Warm temperatures and wind effect at upper elevations, has created a soft storm slab. This overlies variable wind effect in open terrain, and faceted snow in sheltered areas.

A sun crust (Jan 3), down 50cm and most prominent at and below Tree-line on S-SW aspects, has been a failure plane for a few recent human triggered avalanches.

The Dec 1 surface hoar layer is down ~110cm and is decomposing.

Weather Summary

2 frontal systems impacting the interior Friday night and then Sunday morning will bring warm temps, moderate snowfall and SW wind.

Tonight: Flurries (5cm), Alpine low -6°C. Light SW ridgetop winds.

Sat: Flurries (2-4cm). High -1°C, Moderate SW winds, Freezing level (FZL)1600m.

Sun: Snow (up to 20cm). Low -2°C, High 0°C. Moderate to strong SW winds, FZL 1900m

Mon: Isolated flurries. Low -1°C, High 2°C. FZL 2700m.

Terrain and Travel Advice

  • Be especially cautious as you transition into wind affected terrain.

Avalanche Problems

Storm Slabs

Recent snow, accompanied by variable wind and mild temps, has created a soft slab that is most reactive near ridgelines and on convex slopes at lower elevations. Above Tree-line, these storm slabs are thicker and more reactive in windloaded lee features.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2.5

Persistent Slabs

This problem is most reactive on South through West aspects, where a sun crust exists 40-70 cm deep.

Aspects: South, South West.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3