Natural & Skier Triggered Avalanches on Carson Peak & Dream Mtn-June LK Area

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AVALANCHE OBSERVATION
Carson Peak & Dream Mtn

Drainage:

Submission Info
Chris Engelhardt
Forecaster
Thursday, March 28, 2019 - 9:00pm
Red Flags: 
Recent avalanche activity
Avalanche Type: 
Slab
Slope: 
40degrees
Trigger type: 
Skier
Crown Height: 
2 ft
Aspect: 
North
Avalanche Width: 
50ft.
Terrain: 
Above Treeline
Elevation: 
10 600ft.
Bed Surface: 
Old Snow
Avalanche Length: 
800ft.
Number of similar avalanches: 
1
More detailed information about the avalanche: 

It was a spectacular day with the fresh snow blanketing the range and splitter blue sky dotted with passing clouds. All that fresh snow and blue skies can get folks fired up, as seemed to be the case today. Toured to the Hemlock trees of North San Joaquin Mtn outside of June Mountain and all the way down to canyon floor today.  Must of just missed one of our frequent observers Chris O. as we have similiar things to report on.

Observed Natural Avalanche activity on Carson Pk which looked to be a 1-200ft crown 1-1.5'deep in the Pete's Dream area. Debris wasn't real significant in volume,but ran close to the canyon floor, I'd estimate close to 2500ft vertical or more. There was also reported additional skier triggered slides in Pete's Dream, but from my vantage point I did not see skier tracks in the vicinity of the crown I could see. 

Skier Triggered R3D2 Avalanche on north face of Dream Mtn. 50-75" wide crown 1-2ft deep. Looked like a skier ski cut the steep northerly slope and released a majority of the chute below them. The slide ran around 800-1000ft over cliffy and extreme terrain. A boot pack was visible heading back out, so skier appeared to not be caught and aborted to further ski down the slope. Could also see a track on the bed surface below the crown so that was a good sign. 

Hard to tell, but all avalanches looked to be soft slabs, as I could not see any intact blocks left in the track, or adjacent to the flanks etc, but the slides did run over rocky and cliffy terrain with vertical drops.

While skinning up through northerly trees and open areas, dug several handpits and got very easy shears 20 and 30cm down on thick graupel layers (see pictures). One hasty pit block also failed on isolation which I havent seen for a while. Although this was eye opening, did not experience cracking, collapsing or other evidence of instability in the lower elevations of sheltered trees. There looked to be quite a bit of new snow at higher elevations on the leeward side of  ridgeline in the alpine zone, upwards of 2 feet and perhaps locally more.

HNS: 30-40cm above 8000ft   20cm @ 7000ft

Also dug a 100cm deep pit  @ 9813ft    38deg slope   North Aspect (At this location there was 40cm of F-F+ new snow)

CTM13 Q2@ 40cm down

ECTN11 @ 40cm down  (my ECT did not propogate across the block as Chris O found)

Surface to 40cm down =F-F+ snow (primarily graupel forms)  40cm to 100cm down = 4F to 1F old snow

 

 

Avalanche Photos: 
Blowing Snow: 
Yes
Cloud Cover: 
25% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Moderate
Precipitation: 
Snow
Air temperature trend: 
Warming
Wind Direction: 
Southwest
Accumulation rate: 
None
More detailed information about the weather: 

Pretty clear and sunny over June Mountain and the adjacent backcountry terrain today with some broken passing clouds and light snow flurries.. Pretty calm below 10000' with some moderate SW winds at treeline pushing a bit of snow around, but not a huge amount observed. Heavier clouds and increased snow flurries started around 3pm and it looked quite dark to the north when I got off the moutain at 4pm. 

28F @ 230pm  @ 9813elev

37° 44' 7.1448" N, 119° 5' 53.6928" W

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