June Lake Area-San Joaquin Mountain

North End San Joaquin Mountain
Submission Info
Friday, February 8, 2019 - 2:45pm
Red Flags: 
Recent avalanche activity
37° 44' 42.7668" N, 119° 6' 8.2728" W
Snowpit Observations
More detailed information about the snowpack: 

Winds are starting to harden and firm up snow near and adjacent to ridgeline. Adjacent to ridgeline there was shallow windboard (5cm) starting to develop, but it was still soft enough to skin upon. Sheltered snow surface within northerly trees still provided deep cushioned turns. Ski Pen ranged from 30-50cm dependent on how much pressure was put into the turn. Snow was visibly being transported nearly all day by southerly winds and was pluming from the high ridges and summits. 10,200 was our high point for the day in a fairly sheltered environment.  Did not observe any fresh windslab, but it looked like the more exposed above-treeline terrain very well was building wind driven slab on the northeasterly lee aspects. There was one small slide, which looked to be a cornice drop above Fern Creek on the west side of the drainage (D.5 R1 150'vert).

Dug a hasty pit at 9500ft N aspect, 32 degree slope. 


HNS: 140cm

CTM15 Q2SC @ 20cm down, CTH25  Q1RP @ 45cm down, ECTX

Moderate to hard failures at hardness changes between wind deposited snow or varying snow intensity periods.

The northerly trees we were traveling in appeared to have received a very large amount of snow during the storm, as previous rock bands and granite buttresses are now gone beneath the blanket of new snow.  Massive settlement of the pack cleary visible everywhere with tree cones, settlement rings, and small glide cracks opening adjacent to large tree wells.

Snowpack photos: 
Snowpit videos (tests, etc): 
Weather Observations
More detailed information about the weather: 

15F at 130pm 10,200ft.

Superb day with dark blue skies above the desert with increasingly cloudy conditions over the Sierra Crest starting around 1100-1130. Very light snow flurries started around 245pm. Consistent southerly winds all day in higher terrain and snow was visibly bannering off the peaks. Crisp and cold.

ESAC receives support from ...