Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Expect poor snow quality due to massive amounts of recent rainfall.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Use caution in lee areas. Recent wind loading has created wind slabs.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
This layer was awakened by heavy loading during the last storm. Although natural avalanche activity has subsided, this crust remains a concern due to its persistent nature in the snowpack. Human triggering is certainly possible.
Travel and Terrain Advice
- Caution around convexities or areas with a thin or variable snowpack.
Avalanche Summary
A widespread nature avalanche cycle occurred yesterday with the ongoing rainfall and strong winds. Several large size 3.0 wet slab avalanches were observed in the highway corridor. Artillery avalanche control produced large avalanches in the east end of Rogers Pass. A size 3.0 natural avalanche was observed on the Thorington route of Mt Jupiter.
Snowpack Summary
65mm of rain has fallen at Rogers Pass over the last 3 days. The added moisture has dramatically changed the snow quality from early season powder to a saturated upper snowpack capped by a thin surface crust. In the alpine, extreme southerly winds have created a wind slab problem on lee features. October 31 crust is buried 100cm at treeline.
Weather Forecast
After a warm and rainy storm, we will see a return to winter. For today, SW moderate winds gusting to 50km/h, 4cm of snow and freezing levels below 1300m. Expect cooler temperatures and scattered flurries heading into the weekend. A frontal system arrives early Sunday morning with warming temperatures and up to 35cm of snow.
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Extreme southerly winds accompanied yesterday's storm and created reactive wind slabs. This problem is specific to the alpine due to intense rainfall and warmer temps at lower elevations during the storm.