Natural deep slab avalanche on Cement Mountain |
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Estimated failure on 4/14 or 4/15. North to Northwest aspect near treeline. Viewed from a distance, but appeared to fail near the ground. HS-N-R3/D3-O
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4/14/13 Remotely triggered slab avalanche on Schuykill Ridge |
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SE aspect near treeline. Failed on wet grains just below storm interface. Remotely triggered by skiers 100 feet away. 2 feet deep, 400 feet wide, 2000 vertical feet. SS-ASc-R3/D2.5-O
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4/14/13 Natural deep slab avalanche on Whetstone |
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NE aspect above treeline. HS-N-R3-D3-O 4-8' deep, 1,000' wide, 2,000' down
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4/14/13 Natural wind slab avalanche in Coon Basin |
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NE aspect above treeline. R1-D2 wind slab release on the lookers left of Coon basin
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4/11/13 Skier triggered slab avalanche on Whetstone |
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East aspect above treeline. "Ski cuts with no success, then skier dropped in...most of the bowl went. Ran 60 yards across with a 2 foot crown. Ran approx 1500 yards with (1) skier caught and semi buried. No one injured. New snow ran on sun crust."
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4/10/13 Snowmobiler triggered deep slab avalanche on the north side of Crystal Peak |
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Just outside of CBAC forecast zone. Snowmobile triggered on a north aspect above treeline, failing near the ground.
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Natural wet slab avalanche in Rustler’s Gulch |
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Occurred in the last few weeks of March. Southwest aspect above treeline. WS-N-R4/D3-G
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Natural persistent slab near Rustler’s Gulch |
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Likely failed late March. Northeast aspect above treeline. HS-N-R3/D2.5-O/G
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Natural wet slide below Purple Bench |
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Likely occurred late March. South aspect below treeline.
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Natural slab avalanche in Peeler Basin |
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Likely occurred 3/24. N-SS-R2/D2-O/G. East aspect above treeline.
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Shallow skier triggered slide on Snodgrass |
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Shallow skier triggered slab avalanche from the NE side of Snodgrass mountain. Slide began as a loose snow avalanche and slowly entrained heavier moist snow. "It had about a 6 inch crown, ran about 75 meters, and was around 20 meters across."
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3/25/13 Natural windslab on Mt. Owen |
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Likely occurred 3/24 or early 3/25. SE aspect above treeline. 6-12" deep, 4F windslab. SS-N-R1/D1.5-S
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Crown profile
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March 2013. Debris below Mt. Baldy avalanche |
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This is the debris of a persistent slab avalanche that occurred on a north to northwest facing slope above treeline, likely during the second week of March. Skier in the middle for scale.
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Estimated 3/10/13 Natural hardslab failing in older layers in Peeler Basin. |
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NE aspect above treeline. Persistent slab possibly triggered by cornice fall. HS-NC-R2-D2-O.
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3/07/13 Skier triggered slab avalanche on Mt. Emmons |
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Triggered on a N/NE aspect near treeline in Wolverine Basin. Failed in old snow layers. (HS-ASu-R2-D2-O)
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2/27/13 Remote Triggered Avalanche on Mt Axtell |
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2nd Bowl. NE aspect at 11,500ft. 20m wide, 40cm deep, and ran close to 1000ft vertical.
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Crown profile
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2/27/13 Avalanche in the Perry Creek drainage |
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Above treeline on S and WSW aspects. Failed near the ground. Trigger unknown; may have been wildlife.
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2/22/13 Skier triggered avalanche in Upper Slate River |
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Soft storm slab on a northeast aspect below treeline.
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2/21/13 Slide in Climax Chutes NE below treeline |
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A skier triggered slide on a recently crossloaded slope.
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2/9/13 Slides on Mt Bellview SE above treeline |
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3 natural slides that ran 2/9 in shallow windslabs.
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2/5/13 Profile from S aspect above treeline |
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2/5/13 Profile from E aspect near treeline |
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2/5/13 Slide near Kebler Pass, SE aspect below treeline. |
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Either remotely triggered by a snowmobile or occurred naturally. ~2 ft crown. SS-R3D2-O.
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2/4/13 Remote triggered avalanche on Mt Emmons E below treeline |
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The crown propagated close to 400ft through features and changed aspect
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Looking across at the crown
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Debris 700ft below the crown
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2/2/13 Natural avalanches in Ruby Range |
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Robinson Basin. NE aspect near treeline. Likely failed 2/1/13 on facets below the recent storm. Estimated crown depths up to 6 ft deep. SS-N-R3D2.5-I
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Near Ruby Mtn. East aspect above treeline. Windslab likely failed 2/1/13 within storm snow. (SS-N-R2D2-S)
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2/1 and 2/2/13. Explosive triggered avalanches at Irwin. West facing terrain above treeline. |
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Widespread avalanche activity. 1'-4' slabs failing on facets and crusts that formed mid January.
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Debris piles up to 8' deep; snapped numerous trees.
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1/31/2013 Natural avalanche in the Anthracites, east aspect near treeline |
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HS-N-R2D.5-O
Heavily windloaded slope failed at the interface of late January storm on facets. 2-6ft deep crown.
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At the crown and looking down on debris
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1/31/2013 Natural avalanche; SE aspect near treeline at Anthracites |
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Fresh windslab. SS-N-R1D1.5-S
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1/31/2013 Profile on N aspect below treeline in Anthracites |
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1/30/2013 Skier triggered soft slab on a North aspect below treeline |
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1/29/13 Widespread natural windslab avalanches on Ruby Mtn. (E, SE aspects above treeline) |
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Average 2ft crowns. D1.5 to D2's. Most likely failed on a precip particle layer within the storm snow the night before.
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1/27/13 Avalanche on SW side of Mt Gothic above treeline |
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Though this is overall a SW aspect, the slide started on a loaded SE facing side of the path.
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1/27/13 Avalanches on E aspect below treeline
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Four adjacent pockets slid on similar steep convexed terrain features.
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1/27/13 Natural avalanche on a SW aspect below treeline |
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SS-N-R1D2-I(O). Failed on a meltfreeze crust and stepped below the crust to the ground.
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1/27/13 Natural avalanches on NE aspect below treeline |
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SS-N-R1D1-I, failing on facets.
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1/27/13 Crown of a skier triggered storm slab on NE aspect below treeline |
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1/25/2013 Widespread persistent weak layers |
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SE aspect below treeline. Facets above and below the melt-freeze crust near the surface.
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North aspect below treeline
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NE aspect near treeline
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1/18/2013 Snowmobile triggered windslab - E aspect above treeline |
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1/17/13-Skier triggered loose snow avalanche- NE aspect below treeline |
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Size D2 "facet sluff" involving most of the snowpack.
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1/11/2013 Natural avalanches on near surface facets, NE aspect near treeline |
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Soft slabs failing on near surface facets (a persistent weak layer that formed during our early January dry-spell). Expect these slabs to remain sensitive but grow in size with additional winds and snow.
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12/31/12 Remote triggered slide in Coon Basin |
Bowl right, NNE aspect. "C" marks crown profile location. "T" marks trigger point. |
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One of the taller sections of crown, 6ft.
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Looking down at the debris from the midle of the crown. The block resting on the bed surface on the right was roughly 10ft wide by 5ft tall.
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Photo taken near trigger point.
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12/30/12 Skier triggered slide from Gothic
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Reported that a sluff triggered this slab on a SW aspect near treeline.--SS-ASy-R1-D1-I
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12/21/12 Explosive triggered avalanche at Irwin |
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Crown of a hardslab avalanche that was explosively triggered on a west aspect above treeline, failing on depth hoar.
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12/15/12 Remotely triggered avalanche, Schuylkill Ridge |
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One of 4 soft slab avalanches remotely triggered from the ridgeline on N to NE aspects near treeline. Crowns 18" to 24", failing on near surface facets buried early December.
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12/14/2012 Remotely triggered avalanche from Mt. Baldy
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Avalanche lookers left of main bowl on Baldy WSW in a small fetch remotely triggered by a huge collapse down on the flats below.
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12/13/12 Natural Avalanches From Irwin Area |
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Soft slab avalanche on a ENE aspect on Mt. Owen, inititated by windloading.
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"East facing south ridge of Ruby. Various SS-N-R1-D1.5-O...appeared to have been crossloaded by SW wind transported snow. Crown through binos looked to range between 1-4ft deep. Looked to be ~100ft wide running ~200ft"
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12/14/12 Touchy Conditions in the Slate River Valley
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Remote triggered slide in Schuykill Basin. ENE aspect at 10,500 ft. ASr-SS-R1-D1.5-O. A skier triggered this slide from the flats from over 100 feet away.
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12/14/12 Shooting cracks on NE aspects |
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Observers reported wide-spread shooting cracks and collapsing from north, northeast and east slopes below treeline. Many of these cracks propagated over 30 feet.
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10th Anniversary Awareness Night!
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Come out to the CB Center for the Arts Friday, Dec. 14th at 5pm to hang with the backcountry commmunity, drink beer, eat pizza, buy swag to support the CBAC, win big in the raffle or bid on sweet new gear in the silent auction. This year's auction will feature beacons, shovels, probes, backpacks, AT boots, skis from Romp and K2 and lots more!
Oh yea, there will be lots of good information to help keep you safer in the backcountry as well.
There will also be an after party at Montanya Rum Bar with special guest The Johnny Congo All Star Band from Denver.
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Examining a weak snowpack with cracks propagating across an entire slope.
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12/9/12 Natural avalanche - Cascade Mtn |
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This avalanche occurred on a north facing slope and showed impressive propagation, with a 1500 foot wide crown.
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12/9/12 Natural avalanche - Richmond Mtn |
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Natural avalanche on the east face of Richmond Mtn, with crown heights estimated at 3 ft.
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12/3/12 Skier triggered and sympathetic slides- Mineral Point |
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Triggered with ski cuts. The small bowl to the left slid naturally mid-storm.
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12/3/12 Remotely triggered slide, near Augusta Mtn
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On a NE slope above treeline. Remotely triggered on a flat slope from 100 ft away. 5" of dense storm snow failed on near surface facets. Numerous other slides occurred in similar fashion; all failing on the near surface facets that formed during the late November dry spell.
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11/20/12 Cracks in Purple Palace trees |
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These cracks occured with a rumbling collapse on the skiers first turn, and they propagated 30ft into the trees. Just below the slope rolled to >30° where other cracks occured, though an avalanche did not release.
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11/18/12 Paradise Divide Slides |
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Two avalanches reported from Purple Ridge. The first picture is of a natural avalanche that occurred sometime between 11/17 and the morning of 11/18. This avalanche was "75 meters wide and ran approximately 200 meters on a slope beteen 35 and 40 degrees."
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Skiers remotely triggered this slide from the valley bottom. "Slide started on a N/E aspect above treeline and propagated to N. facing slopes. Crown varied from 15 cm to 100 cm. Slide was approximately 300 meters wide and ran as much as 150 meters on steep slopes."
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11/11/12 Skier Triggered Slide on Mt. Baldy
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"Five of us approached Baldy from the South(Elkton) and observed no instabilities on the South aspect. Entered chute above WSC(Mt. Baldy NW aspect, 12000 feet) and it felt punchy, slabby. Pulled out to the rocks and crack appeared at my feet, and propagated across the face. I clawed at the scree as the slide pulled away probably running 1500' at maybe 18" - 24" de
ep. It appeared to have run on faceted snow left over from October. Propagated the entire face(maybe 1000 feet? ). The chute held, the fracture was at the mouth of the chute. I was the first one in, so I booted back up through the rocks and we picked our way safely down the ridge to paradise divide. We observed lots of collapsing and cracking through the meadows by paradise divide"
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