Northern Gallatin

Natural Deep Slab Flanders

Flanders Creek
Northern Gallatin
Code
HS-N-R4-D3-O
Elevation
9600
Aspect
NE
Latitude
45.43300
Longitude
-110.94300
Notes

From obs [2/20/21]: "We observed a large natural slide on Flanders Mountain that likely occurred on Thursday (2/18/21). The crown ranged from 2-5’, but it’s hard to gauge how wide it was, because it covered a lot of elevations. I think there is considerable overlap with the large slide that ran there earlier this season. We did not observe any other slides, collapsing, or cracking, but the wind did pick up in the early afternoon." 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
4
D size
3
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
60.0 inches
Vertical Fall
700ft
Slab Width
1500.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From obs [2/20/21]: "We observed a large natural slide on Flanders Mountain that likely occurred on Thursday (2/18/21). The crown ranged from 2-5’, but it’s hard to gauge how wide it was, because it covered a lot of elevations. I think there is considerable overlap with the large slide that ran there earlier this season. We did not observe any other slides, collapsing, or cracking, but the wind did pick up in the early afternoon." Photo: S. Reinsel

Northern Gallatin, 2021-02-21

From obs [2/20/21]: "We observed a large natural slide on Flanders Mountain that likely occurred on Thursday (2/18/21). The crown ranged from 2-5’, but it’s hard to gauge how wide it was, because it covered a lot of elevations. I think there is considerable overlap with the large slide that ran there earlier this season. We did not observe any other slides, collapsing, or cracking, but the wind did pick up in the early afternoon." Photo: S. Reinsel

Avalanche Details: Natural Deep Slab Flanders
Northern Gallatin, 2021-02-21

Flanders

Date
Activity
Skiing

Here’s one more photo of some of the lower crown of that slide up Flanders. It was deep down lower!

Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
Sam Reinsel

Flanders

Date
Activity
Skiing

We observed a large natural slide on Flanders Mountain that likely occurred on Thursday. The crown ranged from 2-5’, but it’s hard to gauge how wide it was, because it covered a lot of elevations. I’m including a photo with a rough approximation of where it broke—I think there is considerable overlap with the large slide that ran there earlier this season. We did not observe any other slides, collapsing, or cracking, but the wind did pick up in the early afternoon.

Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
Sam Reinsel

East of the Sphinx

Date
Activity
Snowmobiling

Triggered a large slide with a snowmobile. Went all the way to the ground. Crown seemed to range anywhere from maybe 3 ft to 10 ft. Large slabs of snow broke free and slid for about 100 yards

Region
Southern Gallatin
Location (from list)
Sphinx Mountain
Observer Name
Wyatt Carda