Started hiking in the rain at Porter Fork trailhead. Rain turned to snow at 7,000 feet. At 8,000 feet storm snow was 2 feet deep. Noticed collapsing and cracking while breaking trail on the flat. Ascended sub ridge with average 28 deg slope angle, with short pockets 35 deg steep. A steep walled gulley is north of sub ridge. Breaking thru the steep pockets collapsed and cracked the snow pack, avalanching the adjacent gulley. Snowpack failed at the new snow old snow interface, crown was 2 feet. Ultimately avalanched about a quarter mile of the gulley. Topped the sub ridge in a flat pine grove and skied down the up track. Slope south of sub ridge averages 33 deg. It cracked and collapsed during descent, but did not avalanche.

After descent, ascended sub ridge on skin track for second run. Reached pine grove about 2pm. Noticed all aspect natural avalanche cycle had occurred since first run. Many, but not all, paths in upper Porter Fork had avalanched. Maybe 5 or ten avalanches. West face of Raymond, north facing Porter Fork flat top, south face of gulley had all avalanched. All avalanches appeared to fail at new snow old snow interface, with 2 foot crowns. Skied down the up track again.

Ascended skin track to pine grove for third and last run. Skied down the up track again, though ventured a couple feet south to ski cut east facing 33 deg slope, which avalanched. My assessment is the avalanche danger on Sunday will be extreme.