23-24

Wind slab in tobacco roots

Bell Lake
Out of Advisory Area
Code
SS-AS-R1-D1
Elevation
9750
Aspect
N
Latitude
45.53640
Longitude
-112.00300
Notes

Toured up around bell lake today and after a night of wind, triggered a very small wind slab in a north facing couloir at around 9500-10000ft. It was almost 10” deep and was about 10-15ft across. Snow was being loaded through out the day and was staying cold up high. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
R size
1
D size
1
Problem Type
Wind-Drifted Snow
Slab Thickness
10.0 inches
Slab Width
15.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Wind slab in tobacco roots

Date
Activity
Skiing

Toured up around bell lake today and after a night of wind, triggered a very small wind slab in a north facing couloir at around 9500-10000ft. It was almost 10” deep and was about 10-15ft across. Snow was being loaded through out the day and was staying cold up high. 

Region
Out of Advisory Area
Location (from list)
Bell Lake
Observer Name
Jay Alford

Consolidated Snowpack on Miller Mountain

Date
Activity
Skiing

Dug a pit around 9700' on a WNW shaded aspect below a couloir on Miller Mountain in Cooke City. We found ~95cm snowpack, with 5-10" of lower-density fresh snow. We dug to the ground and found a consistent and firm snowpack all the way down, didn't find any facets at the ground. Isolated cracking, ECTN25 ~20-25cm down, below the thick melt-freeze crust from the warm-up immediately before this week's snow. The fresh snow had sluffed out on most chutes before we got there (likely during the storm) but we saw very little sluff triggered by our skiing

The fresh snow skied great on shaded aspects that hadn't been affected by wind. Non-shaded snow surfaces were definitely getting wet by 1 pm, the sun felt hot, but we didn't observe any wet slides before we left. The snow on the ride out was very wet, with watery-slush puddles on the lower parts of the trail.

Region
Cooke City
Location (from list)
Miller Mtn.
Observer Name
William Landrey

Loose Snow avalanches in Beehive and Bear Basins

Beehive Basin
Northern Madison
Code
L-AS
Aspect Range
W-E
Latitude
45.34770
Longitude
-111.38900
Notes

From obs: "We saw several loose avalanches on WSW, ESE & SSE aspects of the ridge between beehive and bear basin.  The one on the ESE slope may have been skier triggered (by another group) and the rest appeared to be natural.  We found a strong crust beneath the foot of new snow throughout our route.  We didn't see any cracks or whumphs, and the new snow wasn't reactive in hand pits.  The snow surface was getting wet as we exited to the beehive trailhead around 3pm."

Number caught
0
Number buried
0
Avalanche Type
Loose-snow avalanche
Trigger
Skier
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Wet loose avalanches in Beehive and Bear Basins

Date
Activity
Skiing

We saw several loose avalanches on WSW, ESE & SSE aspects of the ridge between beehive and bear basin.  The one on the ESE slope may have been skier triggered (by another group) and the rest appeared to be natural.  We found a strong crust beneath the foot of new snow throughout our route.  We didn't see any cracks or whumphs, and the new snow wasn't reactive in hand pits.  The snow surface was getting wet as we exited to the beehive trailhead around 3pm.

Region
Northern Madison
Location (from list)
Beehive Basin

GNFAC Avalanche Forecast for Fri Apr 19, 2024

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>Avalanche concerns through this weekend will chiefly be driven by the new snow that fell this week, in combination with warm temperatures and sunshine.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Avalanches could break in the recent snow, particularly on shady, high elevation slopes. These slides will be the largest and most concerning in areas that got the most new snow and on windloaded slopes. Triggering one of these avalanches is already much less likely than it was during the storm and they will become even harder to trigger as we get further out from the snowfall. Still, stay on alert for signs that the new snow is not bonded well, such as shooting cracks or unstable test results.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>On sunny slopes, the new snow provides the needed ammunition for big wet loose sluffs (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/31834"><span><span><span><strong><span… from last week</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). As the snow surface becomes wet and sticky or you start to see rollerballs and pinwheels, be on high alert. These slides will likely be confined to the new snow, but with a substantial amount of new snow they could pick up a big volume and be quite dangerous. Wet loose slides you trigger will likely break at your feet, but pay attention to what’s above you, because natural slides could come down and hit you from above.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Another concern to keep in the back of your mind is avalanches breaking deeper. Earlier this week a wet slab broke on Mt. Abundance near Cooke City (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/31866"><span><span><span><strong><span… and photos</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>) and on Wednesday riders in the Little Bear area of the northern Gallatin Range remotely triggered a wet slab after the new snow loaded a still wet snowpack (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/31866"><span><span><span><strong><span… and photos</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). Remotely triggered wet slabs are unusual. After a few nights of solid freezes, I don’t expect to see more wet slabs over the next couple days, but regardless, seeing unusual avalanches makes us nervous (especially after the season we’ve had). It’s a good reminder that slides could still fail deeper, whether the snowpack is wet or still dry.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Remain diligent with your snowpack assessments and route-finding, and adapt your decision-making to changing conditions.</span></span></span></span></span></span></p>

Upcoming Avalanche Education and Events

Hyalite Road Closure: Hyalite road is closed to ALL MOTORIZED VEHICLES until the morning of May 16. This is a regular annual road closure to reduce road damage during the spring thaw. Bicycle and foot traffic are allowed. Contact the Bozeman FS Ranger District for more info.

Loose Snow Avalanches Republic Mountain

Republic Mountain
Cooke City
Code
L-AS-R1-D1
Aspect
NE
Aspect Range
N-NE
Latitude
45.00030
Longitude
-109.95400
Notes

A skier triggered multiple loose snow avalanches while skiing near the Fin off of Republic Mountain in Cooke City. 

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Loose-snow avalanche
Trigger
Skier
R size
1
D size
1
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year