Chair Peak/Source Lake Apron. Upper Chair Peak to large bowl uphill/due west of Source Lake.
March 17, 2019, 2:15 p.m. PST
Weather: Warm and sunny. Light winds. Temp 47 degrees Fahrenheit per Alpental mid mountain at 14:00.
Snowpack: Upper 1-1.5ft of 5 day old storm snow had turned to very wet heavy slush on solar aspects.
Area Description: Alpental Valley
Avalanches: D1 loose-wet broke off upper slopes of Chair Peak, off 100ft cliff, and stepped down/gouged apron above upper Source Lake Apron chute. Turned into D 2.5+ wet avalanche which traveled 2/3 the distance to Source Lake and filled the bowl. Debris 4-6ft tall with larger chunks. Ran from ~6000ft to ~4200ft. Narrowly missed 3 snowshoers and dog. Still plenty of similar undisturbed storm-snow turned slush and large cornices in upper slopes of Alpental Valley.
Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an Avalanche? No