Northern Gallatin

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 of slides
0
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 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
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+
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

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." Photo: T. Guarino

Northern Gallatin, 2021-02-19

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." Photo: T. Guarino

Northern Gallatin, 2021-02-19

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." Photo: T. Guarino

Northern Gallatin, 2021-02-19

Natural avalanche below Maid of the Mist

Maid of the Mist
Northern Gallatin
Code
SS-N-R4-D2
Elevation
8400
Aspect
E
Latitude
45.41640
Longitude
-110.97000
Notes

An ice climber in Hyalite reported a natural D2 underneath the Maid today. Looked like it ran yesterday (2/18/21).

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
4
D size
2
Vertical Fall
500ft
Slab Width
200.00ft
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Blackmore, south end of the east face, 9600'

Date
Activity
Skiing

I toured into Blackmore with a client this morning 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.

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Ty Guarino