| Trigger | Natural | Remote Trigger | 0 |
| Avalanche Type | Hard Slab | Aspect | North Northwest |
| Elevation | 4500ft | Slope Angle | 40deg |
| Crown Depth | unknown | Width | unknown |
| Vertical Run | unknown |
Avalanche: Hatcher Pass
Location: Sin Valley: NW facing slope on saddle leading into Government valley.
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
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.
Observer Comments
Only in the one test pit.
Weather
Mix of sun and clouds
Snow surface
10 cm crust