Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Avalanche Problem 1: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Plan to finish your tour early.
- Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
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 travel on slopes that are exposed to cornices overhead.
Avalanche Problem 3: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Thin wind slab 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
Mounds avalanche path released naturally overnight on the April 22 and ran size 3.5, stopping 150m short of the highway. Several other natural loose wet avalanches up to size 3.0 released yesterday.
Cheops North 1 ran size 2.5 on Sunday and it's possible that this slide was human triggered as skiers were in the area.
Start early, finish early!!!
Snowpack Summary
Melt freeze crust on all aspects up to ~2200m and higher on solar aspects. Expect these crusts to break down quickly with warming. Wind slabs in the alpine still persist from this past weekends snow and moderate Southerly winds. Cornices are large and will weaken with the rising temperatures. Dry snow exists on Northerly aspects at high elevations.
Weather Forecast
A temperature inversion overnight has left alpine temps above zero, whereas valley bottom went below zero and got a decent refreeze. Today will be sunny with an alpine high of +5 as the freezing level rises to 3000m. Winds will be 20-35km/hr from the Southwest. Friday will see freezing levels rise to 3700m and will not drop until Sunday night
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Loose wet avalanches can be expected off of solar aspects as daytime warming and direct sunshine destabilize surface layers. These avalanches may dig deeper as underlying snow is moist.