Snow Observations List

From woody ridge, we observed a large avalanche across the republic creek drainage (not sure what the peak is called but see the coordinates). I heard it first since it sounded like thunder or a plane, and then saw a huge cloud of snow moving down the mountain across the drainage.  We do not know if it was natural or triggered by someone.

We also observed large collapsing and whumpfing at the top of woody ridge on wind loaded slopes. Nothing moved as it was less than 30 degrees. 

Bozeman Snow Rangers patrolled Taylor Fork, arriving to 120 rigs in the parking lot. Lots of people stoked for a Blue bird powder day. New storm snow seemed to total ~16 inches up high. We saw numerous recent slab avalanches, some large; and parties reporting widespread collapsing. We observed large natural avalanches from afar on the west side of Snowslide Mountain, and the east aspect of a peak south of Woodward Mountain. We observed these from a few miles away and were probably several feet deep and a few hundred feet wide. We observed another, probably rider triggered avalanche in Wapiti Creek that broke on old snow near the ground ~2 feet deep and ~60ft across.

Temps were ~10F. winds were calm. Sunny.

Some cracks but not shooting.

Slabs growing at top of Bradley’s meadow, around 15-25cm in thickness.

East winds did a number and grew slabs in non-typical locations. 

From IG 2/17: “Out on the cedar/ bear creek wilderness line. 12'x200' and probably 6'x400' on the one in the trees. Both remote triggered. We watched em both come down.”

Saw small old wet slab slides on exposed south facing slopes, skied low angle ENE slopes, dug a pit and the snow was very stable

Probably heard the largest whumph i ever personally heard while skiing near the ridge on the Burn at Sheep Creek. Other groups also reported hearing whumphs too.

while skinning out of sheep on a southern aspect we started seeing signs of warming with little pinwheels but none grew big and none were natural.

Very different feeling from 1 week prior - no collapsing, no cracking, no recent avalanches. We stayed on conservative terrain but saw others venturing out a bit with no noticable activity. 

We dug on southern at 9200 ft  and got ECTN, however as we skinned up on the west side we noticed a little bit of whumphing and we noticed some collapsing while skiing small roll overs on the east aspect. 

From instagram: "Just getting to the ridge by prayer flags in Beehive basin. 100 maybe 200 yards wide. Cracked all the way around the corner almost to a couple old tracks. Seemed to be a natural from last night or this morning.

We saw another big natural avalanche further up the ridge into middle that was a few days old. Propagated across multiple gullies. Crown was 2-3 ft."

We rode up Denny Creek below Lionhead Ridge, then around to the north, through Watkins Creek and into the top of Targhee Creek. We saw a lot of old and recent avalanches that happened at various times over the last week, and in a wide variety of terrain. On lower elevation, generally non-wind-loaded terrain in the trees we saw at least 4 avalanches that were 2'+ deep and 100'+ wide. Near ridgelines there were many avalanches, harder slabs, 2'+ deep breaking hundreds of feet wide.

On our way out we saw a fresh avalanche in Watkins Creek that we think was triggered remotely during the day by a group that was riding in a flat meadow above, where we saw their tracks at least 150 feet away (photo). This slide was 2-3' deep and 100-150' feet wide, breaking on old sugary snow. HS-R3/4-D2-O. We rode along the flat terrain above the avalanche and could feel our sled tracks punch through the supportable slab into weak snow at the bottom of the snowpack.

We felt a couple collapses while sitting on our sleds, and saw a couple long shooting cracks while riding. We dug a snowpit in Targhee creek on a northwest facing slope at 9,435'. We had an ECTP27 below a 2.5' deep slab, sitting on 1.5' of weak sugary snow.

Skies were mostly sunny with a light breeze out of the north.

From email: "Was in round lake was visiting with a guy in the warm up shack.  He said he caused a decent size avalanche on the sheep mountain side. 

It was roughly 100 feet wide, he was hit by the avalanche but didn’t get buried."

Large slide. Snowmobile triggered. North side Scotch Bonnet Mtn. 

Multiple avalanches north of Cooke City today. On the north side of Chimney Rock a large natural avalanche happened either this morning or late last night, 400' wide and 1-2' deep. I saw several other natural avalanches on the east side of Wolverine Peak and Miller Ridge, the north side of Bull of the Woods Pass and Miller Mountain. These avalanches happened sometime just before or near the beginning of this recent storm. 

Most notably I saw a very large rider-triggered avalanche on Scotch Bonnet that was triggered today, 800' wide, 3-4' deep. Skiers nearby confirmed that they saw riders below or on the slope, however, they did not see the avalanche happen. On the east side of Henderson, I saw another rider-triggered avalanche that happened today, 200' wide, 1-2' deep.  

Skiing / skinning on north facing areas above the Brackett Creek area with room many to remember big collapses sounding like distant thunder. One was large enough to shake snow off nearby trees. 

Saw this avalanche today off miller ridge. Looks to be natural, soft slab 

Burnt trees just south of Bacon Rind.   Elevation approx. 7600, eastern face, 30-35 deg. slope. I stopped skiing near the top of the steep section.  Warning  my 3 partners not to descend and to traverse to their left (north).  When I attempt to also exit to the left there was a very noticeable whomp and settling, a crack appeared across and up slope running 50+ ft.  I continued exiting to the north with no further incidents.  

From facebook: "Rode up Portal creek today. Meadows were killer! We had first tracks all the way back to Windy Pass. We triggered 4 avalanches with the farthest one being 300 yards away. The one in the photo was the scariest one. We were playing below the windy pass hillclimb and the chute next to it let go. We had a sledder almost get caught in it, but thankfully everyone was ok. It's scary out there!"

Observed cracking and whumping throughout the day. Towards the end of the day one of our riders remote triggered a massive avalanche on the North facing slope to the North of Yellow Mule cabin. The 3-4 ft crown propagated around 600 yards wide and slid on near ground facets to the bottom of the slope below depositing a very large debris pile well into the trees. 
 

No riders were caught and we inspected the debris pile after. Some of the touchiest avalanche conditions we’ve ever been out in. The meadows were riding nice, I would suggest sticking to them and well away from any steep slopes.

For longevity in the backcountry, base terrain selection decisions on indicators of instability rather than stability and consider the big picture rather than the small one. That is what we did in Beehive/ Bear Basins today (2/15). With an avalanche warning in place, a foot of new snow, a natural avalanche across the valley, and a snowpack that has proven to be reliably unstable this season, we ignored stable test results (ECTN teens and 20s) and absence of observed cracking/ collapsing. We executed our plan to avoid terrain over 30 degrees. Additionally, with the season's history of triggering avalanches from long distances away, we were cautious about traveling below steep slopes.

We met an avalanche class who were working on snowpits closer to the ridgeline. The group experienced one large collapse and had a number of test results that propagated on the weak faceted snow low in the snowpack. 

North facing, cross loaded, mid-mountain slope on an east to west running rib at around 9,600'.  Typically this zone is scoured by W-SW winds.  Mild to moderate winds and new snow of 10-12" sitting on an exceptionally weak base produced a natural release during the recent storm cycle, possibly early AM 2/15/24. The slide appeared to run full track, 800' +, taking out most of the north facing wall.