Observation: Public
Observation Details
Name:
Josh HirshbergObservation Date:
March 28, 2021Submitted:
March 28, 2021Zone or Region:
Stevens PassActivity:
Skiing/SnowboardingLocation:
Tunnel CreekTriggered Avalanches
Did you trigger any avalanches?
YesWas it intentional?
NoAvalanche Type:
Dry Loose (Sluff)Size:
Size 1: Relatively harmless to peopleElevation:
5,400Aspect:
SEComments:
Triggered a handful of very shallow (3cm) sluffs in the new snow on steep solar slopes w smooth old crusts.Photo:
Signs of Unstable Snow
None reported
Observations
Terrain: Hollywood Bowl in Tunnel Creek via Stevens Pass ski area.
Weather: Overcast skies, moderate W winds w light blowing snow, light snowfall becoming moderate (S1) by 12:00. Accumulation was 3cm at 13:00. Snow, wind, and avalanche hazard increased after I left the field.
Snowpack: Surfaces were partially frozen. Boot pen varied from 0-30cm. I dug a profile at ESE, 5,400ft in Tunnel Creek. Notable layers: The upper 40cm is a sandwich of multiple semi-frozen crusts and moist melt forms w the most recent wetting front down 40cm. Moist, weak (4F hard) melt forms down 70cm. The Jan 24th facets are 1F hard, showing sintering, and down 216cm with K- hard and P+ hard adjacent layers. See the graph and photo below for more details.
Media
