Avalanche: Hatcher Pass

Location: Sin Valley: NW facing slope on saddle leading into Government valley.

Route & General Observations

Observed windespread persistant slab failures. All appeared older: 5-10 days old One more recent cornice triggered sz2.5 off a N facing Alp slope to the N/NE of the dot and our test pit.

Test pit at base of slope: HS 150cm. CTE(10) & CTM ((15) sudden collapse/Q1 dn 60 on facts sz 2. (note 1m+ 4F facets below and P slab above). A ECT produced no results on the same layer. However – once the 10cm surface crust was broken we got a collapse below the load – but no propgation.

In my assessment – the 10cm supportive crust and cooler temps are notable. However – we did not feel comfortable traveling on (or under) any N facing unsupported or steep terrain.

Avalanche Details
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Trigger NaturalRemote Trigger0
Avalanche Type Hard SlabAspect North Northwest
Elevation 4500ftSlope Angle 40deg
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Appeared Nc off Bald Mountain Ridge. Also - there widespread avalanches on NW-N-NE slopes on Hatch and government peaks - but these appeared older. The Bald mountain ridge avalanche seemed more recent (fresh debris and crown - perhaps 48 hours old? It ran to valley bottom of Sin Valley, filling the ditch and covering numerous traversing tracks.

Red Flags
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Observer Comments

Only in the one test pit.

Weather & Snow Characteristics
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Mix of sun and clouds

Snow surface

10 cm crust