Northern Madison

Natural avalanche on Fan Mountain

Fan Mountain
Northern Madison
Code
SS-N-R2-D2
Latitude
45.29810
Longitude
-111.52400
Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Vertical Fall
1000ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Unstable test results in Beehive

Date
Activity
Skiing

My friend and I toured in Beehive this morning.  Was calm early but the winds picked up late morning and were whipping around pretty good as we left mid-afternoon.   Dug a quick pit at ~9300 ft along the upper east side of the west ridge of Beehive Basin (lower end in the timber before it gets exposed in the upper basin).  Snowpack was ~120cm deep, approximately half of that being from the last storm series.  We got an ECTP11 that was a smooth propagation which failed ~65 cm up from the ground at the interface of the new storm snow.  This reinforced the instability we expected to find and we stuck to a few laps of the smaller / gentler east facing meadows.  Skiing was great though!  With the wind today I’m sure the instability will only get worse before it gets better…

Region
Northern Madison
Location (from list)
Beehive Basin
Observer Name
William Moore

Small windslab along Beehive Ridge

Beehive Basin
Northern Madison
Code
SS-N-R1-D1
Elevation
9000
Aspect
E
Latitude
45.34070
Longitude
-111.39100
Notes

Small natural windslab under the cornice on the Beehive Ridgeline around noon on 12/18. It broke up to around a foot deep, 20 ft wide, and ran about 15 vertical feet.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
1
D size
1
Problem Type
Wind Slab
Slab Thickness
12.0 inches
Vertical Fall
15ft
Slab Width
20.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year