Observation: Public
Observation Details
Name:
Josh HirshbergObservation Date:
March 13, 2021Submitted:
March 13, 2021Zone or Region:
Stevens PassActivity:
Skiing/SnowboardingLocation:
Upper Nason creekTriggered Avalanches
Did you trigger any avalanches?
YesWas it intentional?
NoAvalanche Type:
Wet LooseSize:
Size 1: Relatively harmless to peopleElevation:
5280ftAspect:
SEComments:
2 small wet avalanches triggered on a convex rollover around 12:45. 10cm deep, 20ft vertical.Observed Avalanches
Did you observe any avalanches?
YesAvalanche Type:
Wet LooseSize:
Size 1: Relatively harmless to peopleElevation:
4,400ftAspect:
SEComments:
A notable natural slide gouged below surface layers running to D1.5, roughly 30cm deep. It likely ran on the 12th.Photo:
Signs of Unstable Snow
None reported
Observations
High, thin clouds allowed the sun to soften solar aspects up to at least 5,400ft by 11:00. Solar aspects had a solid overnight freeze. Polar aspects stayed mostly dry (except under tree canopy) as low as 4,000ft. We saw a few glide cracks that had opened on rock slabs over the past week.
5,100ft on SE
HS +400cm. Mid-Jan crust down 250cm
0-3cm- F hard, moist, melt forms
3-18cm- P+ hard, melt-freeze crust
18-50cm- 1F-P+ hard
50-58cm- P+ hard melt forms
Media
