"Here’s one more photo of some of the lower crown of that slide up Flanders. It was deep down lower!" Photo: S. Reinsel
Avalanche Details: Natural Deep Slab Flanders
Northern Gallatin, 2021-02-21
Northern Gallatin
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
Forecast link: GNFAC Avalanche Forecast for Sun Feb 21, 2021GNFAC Avalanche Forecast for Mon Feb 22, 2021
Northern Gallatin, 2021-02-21
Forecast link: GNFAC Avalanche Forecast for Sun Feb 21, 2021GNFAC Avalanche Forecast for Mon Feb 22, 2021
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
Flanders
Date
Activity
Skiing
Saw evidence of a natural avalanche on an east aspect in the Flanders drainage today. Avalanche appeared to have happened in the last day or two and appeared to have slid at the ground. Visibility made it difficult to determine the extent of the slide.
Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
S Wilson
Whumph on Little Mt. Ellis
Mt Ellis
Northern Gallatin
Code
Latitude
45.57770
Longitude
-110.95500
Notes
From email:"At 6450 feet on a north facing aspect on Little Mt. Ellis I found a snow depth of 75 cm. I dug a pit and got a Ct -7. Ect - 18, both failing on ground facets at 15-20 cm depth. I didn’t see any slides, but I did feel and hear one whumpf on the way up."
Number caught
0
Number buried
0
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year
Natural avalanche on Blackmore east face
Mt Blackmore
Northern Gallatin
Code
HS-N-R4-D3-O
Elevation
9600
Aspect
NE
Latitude
45.44310
Longitude
-110.99900
Notes
From email: "I toured into Blackmore [2/19/21] and observed an old snow avalanche at 9600' on the east face of Mt Blackmore. I was there the day before and didn't see any evidence of avalanche activity; strong overnight winds with ample snow available for transport appeared to be enough to tip the scales."
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
72.0 inches
Vertical Fall
500ft
Slab Width
700.00ft
Weak Layer Grain type
Faceted Crystals
Weak Layer grain size
2.00mm
Weak Layer Hardness
4F+
Slab Layer Hardness
P+
Images
Attached Videos
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year