Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Storm slabs are running naturally this morning with the help of strong winds. Expect another pulse of avalanche activity when the afternoon sun comes out.
Avalanche Problem 1: Storm Slabs
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.
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Sun crusts are buried 30-60 cm on steep solar aspects. This interface provides a smooth bed surface and may contribute to larger than expected avalanches. It is possible for storm snow avalanches to trigger this lingering problem.
Travel and Terrain Advice
- Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
- If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
Avalanche Summary
We are in the middle of a natural avalanche cycle. Activity peaked this morning with strong southerly winds transporting the new snow that fell last night. Several size 2.5 to 3.0 natural avalanches were observed in the highway corridor east of Rogers Pass.
Snowpack Summary
15cm of new snow arrived overnight with moderate to strong southerly winds. This sits atop a reactive storm layer that is 30-40cm deep. Expect to see recent cornice growth and additional wind loading on lee aspects. A crust buried 60cm is present on steep solar aspects. Deep persistent weak layers are dormant and buried over 1.5m.
Weather Forecast
Scraps of an upper cold front give isolated flurries today with trace amounts of precipitation. Increasing sunshine this afternoon as the front is replaced with a ridge of high pressure and warming temperatures. Freezing levels at 1100m. Expect 20km/h westerly winds with the occasional strong gust. Freezing levels climb to 2500m early next week.
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New snow and southerly winds have created reactive storm slabs. Slabs will be well-formed on lee features when wind has contributed to loading. These slabs are touchy and sensitive to human triggered loads as well as natural inputs like wind and sun.