12-13

During an avalanche awareness course in the Lionhead Area near West Yellowstone, participants found a strong and stable snowpack while doing stability tests.  Cohesive blocks nearly five feet long were removed from the snowpit intact. This is a good indication the snowpack on this particular slope lacks persistent weak layers. Photo GNFAC    


Forecast link: GNFAC Avalanche Advisory for Sat Dec 22, 2012GNFAC Avalanche Advisory for Sun Dec 23, 2012GNFAC Avalanche Forecast for Tue Dec 25, 2012GNFAC Avalanche Advisory for Wed Dec 26, 2012
Lionhead Range, 2012-12-21
Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original

    • This slide occurred on Thursday, Dec 20, and was probably triggered by a falling piece of cornice.  The snowpack was most likely thin and had weak facets at the ground/rocks.  From Bozeman, bare slopes on the west side of this peak can be seen telling us that the snow was blown by the wind and deposited on the slope where this avalanche occurred.  Photo: GNFAC


    Forecast link: GNFAC Avalanche Advisory for Sat Dec 22, 2012GNFAC Avalanche Advisory for Sun Dec 23, 2012
    Bridger Range, 2012-12-20
    Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original
    • Subscribe to 12-13