Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Pockets of wind slab are the primary concern for human triggering today. Take the time to dig down and test the November 26th crust before committing to larger slopes.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- Dig down to find and test weak layers before committing to a line.
Avalanche Summary
Five size 2 natural avalanches were observed in the highway corridor from very steep, wind-loaded start zones on the north face of Mt Macdonald. Steep, wind loaded features are the number one avalanche concern heading into today.
Snowpack Summary
The November 26th crust layer is easily identified down 65cm. It separates the moist and warm lower snowpack from the cold and dry upper snowpack. Stability tests from yesterday show that new snow is bonding well to the crust at tree line. The recent storm snow is variable at higher elevations and may include reactive pockets of wind slab.
Weather Forecast
A frontal system moves in this afternoon bringing 6cm of accumulation today and 8cm overnight. Winds will be moderate from the SW and freezing levels will hover around 1100m. A ridge of high pressure is expected to build on Sunday, deflecting moisture to the north and leaving Rogers Pass with mainly dry conditions for the rest of the week.
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Successive waves of precipitation have arrived with strong southerly winds in the alpine. The storm snow seems to be bonding well to an existing crust (Nov. 26), but pockets of wind slab remain a concern. Human triggering of wind slabs is possible.