19-20

Middle Basin Cornice Fall

Middle Basin
Northern Madison
Code
C-AOu-R2-D2-I
Elevation
9200
Aspect
SE
Latitude
45.32370
Longitude
-111.38100
Notes

Large cornice collapse in Middle Basin. The cornice broke 10' back from the edge, 6-7' deep, and ran 800-1000' vertical. The collapse was triggered by a dog in another party.

The crown depth in the cornice was 6-7', but the snow rode up onto the interface and gouged 24" of snow out. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Cornice fall
Trigger
Unclassified artificial trigger (specify in comments)
Trigger Modifier
u-An unintentional release
R size
2
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
72.0 inches
Vertical Fall
800ft
Slab Width
100.00ft
Images
Middle Basin Cornice Fall 3
Middle Basin Cornice Fall 2
Middle Basin Cornice Fall 1
Attached Videos
Too Close for Comfort, Middle Basin - 5 January
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

Large cornice collapse in Middle Basin. The cornice broke 10' back from the edge, 6-7' deep, and ran 800-1000' vertical. The collapse was triggered by a dog in another party. Photo: GNFAC

Avalanche Details: Middle Basin Cornice Fall
Forecast link: GNFAC Avalanche Forecast for Mon Jan 6, 2020GNFAC Avalanche Forecast for Tue Jan 7, 2020GNFAC Avalanche Forecast for Thu Jan 9, 2020
Northern Madison, 2020-01-05
Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original

    • We visited the avalanche that was triggered by a snowmobiler and partially buried 2 people on January 4th. The crown was 10 feet at the deepest part. Photo: GNFAC

    Avalanche Details: Three snowmobilers caught in very large slide on Buck Ridge
    Forecast link: GNFAC Avalanche Forecast for Mon Jan 6, 2020GNFAC Avalanche Forecast for Wed Jan 8, 2020GNFAC Avalanche Forecast for Thu Jan 9, 2020
    Northern Madison, 2020-01-05
    Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original
    • Subscribe to 19-20