Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Rising freezing levels and strong solar input will bring increasing avalanche danger over the day.
Avalanche Problem 1: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
- Plan to finish your tour early.
Avalanche Problem 2: Cornices
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Cornices are large and ripe. They will become more prone to failure with daytime warming and solar input.
Travel and Terrain Advice
- Avoid steep slopes below cornices.
Avalanche Problem 3: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Thin surface windslab can be expected on northerly aspects in the alpine.
Travel and Terrain Advice
- Use caution in lee areas. Recent wind loading has created wind slabs.
Avalanche Summary
On the flanks of Mt Tupper the glide crack in Mounds slide path released naturally sometime overnight and ran size 3.5. Yesterday afternoon Cheops North 1 ran size 2.5. It is possible that this slide was human triggered as skiers were in the area. Yesterday our field team was able to push moist surface sluffs to size 0.5 below 1700m on a W aspect.
Snowpack Summary
30cm storm snow over the weekend and moderate S through SW winds have formed wind slab on alpine lee slopes. At lower elevations storm snow insulates the old moist snow surface. Dry snow still exists on N'ly aspects at high elevations. Cornices and wind loading lurk above treeline. The April 7 crust is now down 60cm and still a concern.
Weather Forecast
A prolonged high pressure period begins today. Freezing levels should rise to 2100m with light ridge winds today. Tuesday freezing levels rise to 3100m with an alpine high of +4C. Freezing levels continue to rise later in the week with little or no overnight recovery.
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Loose wet surface slides can be expected off of solar aspects as daytime warming and direct sunshine destabilize surface layers. These slides may dig deeper as underlying snow is moist.