Sprinter

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/17/2021
Name: Andrew Breibart

Zone: Southeast Mountains
Location: Coneys
Aspect: North East, East
Elevation: BTL

Avalanches: NA
Weather: Mostly cloudy and calm. On skate out, intermittent S-1 snowfall.
Snowpack: 4 inches of 12 hour snow in CB South at my house at 6:30 AM.
<2 inches of new snow at trailhead and <1 inch of new snow on ridge line of Anthracite Mesa. Snow in the bowl was 100% supportive spring snow.
Bare areas are appearing around trees with expansive branch system that extends outward from the trunk.

Gothic 7am Weather Update

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/14/2021
Name: billy barr

Zone: Southeast Mountains
Location: Gothic
Weather: Scattered light snow Tuesday and overnight into Wed. with just 1½” new snow and 0.15″ of water. Snowpack sits at 28″, up 1″ from the year’s low. The snowpack did not harden much overnight so could get quite rotten if we get decent sun as there was a bit of clearing starting just before sunrise. Breezy overnight and currently around 3-6 mph SW. Not much to write about but it is the heaviest snow ‘storm’ this month so far.

Tipsy cornices!

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/11/2021
Name: Ben A

Zone: Southeast Mountains
Location: Wolverine Ridge
Aspect: East
Elevation: ATL

Avalanches: Skier triggered very small wet looses on E aspects, and very small dry looses on due north. Both confined to very steep terrain.
Snowpack: Cornice about 100 yards long pulling way back from the Wolverine Ridge. See photos, pretty cool if you’re on the right side of it.

Photos:

crusts, corn, slides

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/07/2021
Name: Mark Robbins

Zone: Northwest Mountains
Location: upper slate drainage

Avalanches: Not sure when these ran or if they’ve already been documented. North end of Schuylkill ridge, probably ENE facing? And Purple Ridge near Poverty Gultch, SW facing. See photos.

Weather: Windy AF up high, in and out of clouds, cool air temps

Snowpack: Skiing just before noon, South facing at 12,500 showed minimal signs of softening. By 12,000 the top inch was soft. By 11,500 and SE exposure we got into full corn, 2-3 inches of soft snow. Mushy but still supportive by 10,500 at 12:15.

Photos:

Wet Slab Star Peak Zone

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/02/2021
Name: Ben A

 

Zone: Southeast Mountains
Location: Star Ridge above Friends Hut
Aspect: South
Elevation: ATL

Avalanches: Wet slab triggered by wet loose late afternoon 4/2. Wet slab triggered below the rock band. Debris ran over the bench and triggered another wet slab.

Photos:

Late day wet snow check-in

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/02/2021
Name: Ben Pritchett

 

Zone: Northwest Mountains
Location: Roadside observations around Crested Butte. Late day wet snow check-in. Assess depth of melt-water infiltration in relation to potential Wet Slab avalanche problems.
Aspect: North, North East, East, West, North West
Elevation: 10,000

Avalanches: Photo 1: A wet snow surface on a mostly dry snowpack at 10,000′ on a northeast-facing slope. April 2, 2021.
Photo 2: A pattern of small natural avalanches on southeasterly-facing slopes near and above treeline. April 2, 2021
Photo 3: A small natural avalanche on a south-facing slope above treeline. April 2, 2021
Photo 4: An example of an easterly-facing slope that could become dangerous without a freeze at mid-elevations.
Photo 5: A pair of recent slab avalanches that ran on the east to northeast-facing slopes off the Ruby/Owen ridge, and Scarp Ridge.

Estimate* 3/29/21- 1- >TL- E-C-N-R1-D1
Estimate* 3/29/21- 1- >TL -SE-C-N-R1-D1
Weather: Ridgeline Wind Speed: Calm
Wind Loading: None
Temperature: 53 F
Sky Cover: Few
Depth of Total Snow: 120 cm
Weather Description: 53 degrees at 10,000′ at 3pm.
Snowpack: Near 10,000 feet, on northwest through north to northeast-facing slopes, the snowpack was mostly dry, with meltwater draining down only around 10cm so far. Below and near treeline, the shoulder aspects of east and west look the closest to developing a Wet Slab avalanche problem. The steeper southeast through south to southwest-facing slopes are wetted to the ground and melting out quickly. At the Butte snotel at a similar elevation, it did not freeze Thursday night, and it may not again tonight (Friday night). In the worst case rocky terrain features rocky with a shallow snowpack, human-triggered Wet Slab avalanche may become possible by late afternoon Saturday. If there’s another night without a freeze on Saturday, natural Wet Slab avalanches might run Sunday.

 

Photos:

Wolverine Cornice Fall

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/01/2021
Name: Tim Mahan

Zone: Southeast Mountains
Location: Mt Emmons. Wolverine Basin.
Aspect: East
Elevation: 12,100

Avalanches: WL-N-R1-D1-O E facing rock band at the top of wolverine basin bowl feature.

Photos:

Large cornice avalanche

CB Avalanche Center 2020-21 Observations

Date of Observation: 04/01/2021
Name: Zach Kinler Evan Ross
Zone: Northwest Mountains
Location: Southern Ruby Range
Aspect: East, South East, South
Elevation: 9,000′-12,600′

Avalanches: Observed several Wet Loose avalanches, both natural and human triggered. Size ranged from D1-D1.5 with activity primarily on steep East, South and Southwest slopes near and above tree line. While traversing the Ruby spine we encountered several large overhanging Cornices which had begun to pull back from the ridge. Two of these were triggered from dry ground on the ridge by simply “pole whacking” the gap.

We got a close look at the previously reported Cornice Avalanche on the SE flanks of Mt Owen. This was a big section of cornice that fell down and resulted in a large D2.5 avalanche. The cornice initially gouged close to the ground in steep rocky terrain, then appeared to run on March interfaces as dust layers can be seen on the bed surface.

Weather: It’s heating up! We skinned in t-shirts most of the day. Temps soared above freezing at all elevations today under abundant sunshine. Westerly winds were light at rideline.

Snowpack: We travelled primarily on sunny aspects from E-S near and above treeline. By 12:00, we observed several small natural Wet Loose avalanches on steep East aspects near tree line. As the day progressed, action moved to South aspects and eventually Southwest slope near and above treeline. While these avalanches were only entraining the upper few inches of wet snow, they were gaining momentum on larger slopes. Skiing off the ridge in the late afternoon, we choose to avoid our intended ski objectives that was south east facing above 12,oooft to due to the fact that we would be triggering loose wet avalanches and didn’t feel we could safely manage the problem on that terrain feature. While briefly hanging out on the bed surface of an old cornice avalanche you could actually hear water cascading somewhere. Sounded like you were standing next to a running water fountain.

Cornices, which have grown large throughout this season on certain leeward aspects, proved to be sensitive where large portions are overhanging ridges and are beginning to pull back from ridgeline. These babies are very unpredictable with some being resistent to cutting while others may be triggered by simply hitting the right spot or right time of day. These beasts were best managed by avoiding traveling on or below slopes where present.

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