Northwest Avalanche Center

Observation: Public

All Observations

Observation Details

Name:
Dallas Glass
Observation Date:
February 4, 2023
Submitted:
February 4, 2023
Zone or Region:
West South
Activity:
Skiing/Snowboarding
Location:
White Pass Backcountry: 5700ft-6700ft W-N-E-SE aspects.

Signs of Unstable Snow

Did you see shooting cracks? 
Yes, Isolated
Did you experience collapsing or whumpfing? 
No

Observations

Weather: Light to occasionally moderate snowfall while we were out touring. New snow during the tour ~1". At lower elevations light easterly flow was noticeable. At ridgecrest winds were light to moderate out of the SSW with light blowing snow. The sun tried a few times to poke through the clouds but wasn't very successful. While we experienced snow fall throughout the tour, we could feel the warming temperatures. Snowlevels were very close to Pass level ~4500-4600ft.

Snowpack: Storm totals seemed to be around 4in and growing. We could feel a wide variety of older surfaces under the storm snow. On ESE-S-WSW the new snow was poorly bonded to a very firm crust. This made for difficult uphill travel. On WNW-N-ENE, the crust was absent, allowing the snow to feel much deeper than the storm totals would make you believe. We dug several hand pits on a variety of slopes and did not find any unstable snow at the 2/3 interface. We did however have a few hand shears fail on weaker sugary snow (rounding facets) about 18" (45cm) below the surface. I think this is 1/18 interface and it sits about 4-6in (10-15cm) above the MLK crust.

Below 4800ft the snow became much heavier and sticky. We didn't see any loose wet slides during our minimal travel at these lower elevations, bit we did see several new rollerballs.

Media

While we could get uptrack tests to crack, the propagation was minimal.
Example of one of our hand shears failing on rounding facets likely at the 1/18 interface. N, 5900ft.

Advanced Observations

Observed Avalanche Problem #1: 
Wind Slab
Comments: 
We found wind slabs up to 8in thick on W-N-NE aspects near treeline. While we could get these pockets to crack, none of our small slopes produced any results. Their presence did cause us to avoid a few wind loaded slopes with steep convex rolls.
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