Glacier National Park Avalanche Forecast

Issued: Nov 17th, 2021 4:00PM

Wed Nov 17th Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Low
Thu Nov 18th 2 Day Outlook
Alpine Moderate Treeline Low Below Treeline Low
Fri Nov 19th 3 Day Outlook
Alpine Considerable Treeline Moderate Below Treeline Low

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Storm Slabs.

Seems like the storm slabs are healing with the cooling temperatures, but I would give it a bit more time before I jumped into anything big and steep!

Summary

Weather Forecast

Continuing cool temps with isolated flurries

Tonight: mainly cloudy, Alpine low -9*C, light winds

Thursday: cloudy with possible flurries Alpine high -8*C, light SW winds

Friday: cloudy with sunny periods, Alpine high -8*C, light SW winds

Saturday: light snow, possibly 10cm by day's end. Alpine temps -10*C, Mod-strong winds

Snowpack Summary

We have very limited snowpack obs still! We do know at lower elevations there is a rain crust with around 10cm of new snow on top of it, and fairly typical early season conditions. The height of snow in the alpine and upper treeline is well above average for this time of year; we are currently 10cm shy of our record height of snow at Mt Fidelity!

Avalanche Summary

A large natural avalanche cycle ripped through Rogers Pass Sunday and Monday to size 3.5; The size and frequency of natural avalanches was an unprecedented event for November. The storm has finished and so has our the large destructive natural avalanches running to valley bottom; however human triggered large avalanches are still possible.

Confidence

Due to the number of field observations

Problems

Storm Slabs

An icon showing Storm Slabs

Likelihood

Possible

Expected Size

2 - 3

Natural storm slab avalanche activity has subsided with cooling temperatures, clear skies, and waning winds. That being said, we received 150mm of precipitation in 36 hours and it may take a bit more time for the storm slabs to completely heal.

  • Use caution in alpine and open treeline lees. Recent snowfall has created storm slabs.
  • Avoid paths that have not avalanched recently.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Valid until: Nov 18th, 2021 4:00PM

Forecast Trend

The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.