24-25

Loose avalanches around Blackmore

Date
Activity
Skiing

Saw lots of small loose avalanches on Mt Blackmore and nearby slopes, some appeared to be natural and others skier triggered. We saw multiple dry loose on N and E aspects and a wet loose on a southeast aspect.

We also noticed recent wind loading on the southeast side of ridgetops and scouring on north slopes.

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Heather Myers

GNFAC Avalanche Forecast for Thu Mar 6, 2025

Snowpack and Avalanche Discussion

<p><span><span><span><strong><span><span>The avalanche danger will be rising today</span></span></strong></span></span></span><span><span><span><span><span><span> with wind and snow, but there’s a lot of uncertainty with how much snow will fall. .</span></span></span></span></span></span></p>

<ul>
<li><span><span><span><strong><span><span>Wind slab avalanches</span></span></strong></span></span></span><span><span><span><span><span><span> will be the main hazard today as winds from the E and NE increase by afternoon. These wind slabs will be widespread and easy to trigger. HEADS UP - Expect drifting in odd places because winds don’t typically blow from the east.</span></span></span></span></span></span></li>
<li><span><span><span><strong><span><span>Persistent slab avalanches</span></span></strong></span></span></span><span><span><span><span><span><span> 2-3 feet deep remain a threat on isolated slopes in the mountains near West Yellowstone (southern Madison and Gallatin Ranges, and Lionhead). This is a tricky problem and has surprised riders on slopes like one at </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/34421"><span><span><span><span><span><… last Friday</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span> and </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/34413"><span><span><span><span><span><… Creek last Thursday</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>.</span></span></span></span></span></span></li>
<li><span><span><span><strong><span><span>Storm slab avalanches</span></span></strong></span></span></span><span><span><span><span><span><span> in the new snow could become a problem this afternoon on all steep slopes if forecasted snow amounts of 8-12 inches pan out.</span></span></span></span></span></span></li>
</ul>

<p><span><span><span><span><span><span>The avalanche danger will rise to CONSIDERABLE today on wind loaded slopes and MODERATE on non-wind loaded slopes. With the danger rising and multiple avalanche problems, </span></span></span></span></span></span><span><span><span><span><span><u><span><span>the best plan today will be to step back mostly avoiding avalanche terrain and let the storm play out.</span></span></u></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger today near Bozeman, Big Sky, and Cooke City will be rising as well mainly due to east winds.</span></span></span></span></span></span><span><span><span><strong><span><span> Watch out</span></span></strong></span></span></span><span><span><span><span><span><span> for places locally heavier snowfall amounts where the danger will be higher. These places could be in our normal forecast zones or more likely areas to the east.</span></span></span></span></span></span></p>

<ul>
<li><span><span><span><strong><span><span>Wind slab avalanches</span></span></strong></span></span></span><span><span><span><span><span><span> will be the main concern today, and strong winds from the east will cause <strong>drifting in unusual places</strong>. Strong easterly winds had already developed in the Bridgers early this morning and should blow strong in all other places by this afternoon. I bet fresh wind slabs will be easy to trigger but shallow.&nbsp;</span></span></span></span></span></span></li>
</ul>

<p><span><span><span><span><span><span>Don’t take today’s avalanche situation lightly. </span></span></span></span></span></span><span><span><span><span><em><span>Weird weather (east winds) can cause weird avalanches</span></em></span></span></span></span><span><span><span><span><span><span>, so I’d be stepping back today, generally avoiding avalanche terrain to see what this storm does regardless of how much snow falls. Today the avalanche danger is MODERATE. </span></span></span></span></span></span></p>

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Cracking in wind drifted snow

Date
Activity
Skiing

Observed some cracking in wind drifted snow above tree line NE facing slope. No avalanches observed 

 

Region
Cooke City
Location (from list)
Hayden Creek
Observer Name
J Mundt

Old slide in hell roaring drainage

Hellroaring Creek
Northern Madison
Code
SS-R2-D2
Aspect
E
Latitude
44.54900
Longitude
-111.47500
Notes

Came across a old slide in the hell roaring drainage heading towards Gallatin.  East facing. Happened sometime before the recent snow but not long ago. Initial crown seemed to be 12-18 inches and stepped down further down the slope. Was a fairly large debris pile.

 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
R size
2
D size
2
Slab Thickness
15.0 inches
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Came across a old slide in the hell roaring drainage heading towards Gallatin.  East facing. Happened sometime before the recent snow but not long ago. Initial crown seemed to be 12-18 inches and stepped down further down the slope. Was a fairly large debris pile. Photo: S Knowles

 

Northern Madison, 2025-03-05

Old Avalanche N Madison

Wilson Peak
Northern Madison
Code
SS-NC-R2-D2
Latitude
45.32700
Longitude
-111.32500
Notes

Old Avalanche spotted from Wilson yesterday looking  North. Possible cornice fall trigger during the warm up but difficult to tell as it was quite a ways away.  Photo attached. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Cornice fall
R size
2
D size
2
Problem Type
Cornice Fall
Vertical Fall
150ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Old slide in hell roaring drainage

Date
Activity
Skiing

Came across a old slide in the hell roaring drainage heading towards Gallatin.  East facing. Happened sometime before the recent snow but not long ago. Initial crown seemed to be 12-18 inches and stepped down further down the slope. Was a fairly large debris pile.

 

Region
Northern Madison
Location (from list)
Hellroaring Creek
Observer Name
Shane Knowles

Old Avalanche N Madison

Date
Activity
Skiing

Old Avalanche spotted from Wilson yesterday looking  North. Possible cornice fall trigger during the warm up but difficult to tell as it was quite a ways away.  Photo attached. 

Region
Northern Madison
Location (from list)
Wilson Peak