| Trigger | Natural | Remote Trigger | Unknown |
| Avalanche Type | Unknown | Aspect | Unknown |
| Elevation | unknown | Slope Angle | unknown |
| Crown Depth | unknown | Width | unknown |
| Vertical Run | unknown |
Avalanche: Turnagain
Location: Tincan
Did some road obs down to Johnson Pass then skied up to treeline on Tincan.
Avalanche Details
Saw several avalanches from the road today. I think most were in the D2 to D2.5 size range but it is hard to be confident from afar with poor visibility. There was a cluster of 3 large debris piles on the SE aspect of peak 4940' which released somewhere between 2500 - 3500'. These all looked like they had some cross loading in gully features. There was another large release on a SE aspect further north along Seattle ridge, almost across from the Sunburst parking lot. From a distance it was hard to tell if these released just the storm snow for the past few days or if they released on a deeper weak layer.
There was also an avalanche at about 2200' on the NW aspect of Magnum. With the poor visibility I couldn't tell if this released up higher and ran down to treeline or if the crown was just on the lowest steep roll on the NW aspect of Magnum.
Weather
Light rain up to about 750' then light snow above. Winds were calm to light on Tincan. Temperatures were around 35 F at sea level and 32 F at the top of the pass.
Snow surface
There was a trace of fresh snow on top of a large melt freeze crust. Below about 2000' the crust was breakable and about 5 cm thick. Above 2000' there was more fresh dry snow on the surface and the melt freeze layer underneath was supportable. I only made it up to 2200'.
Snowpack
Dug a snowpit at 2200' on a N aspect near the top of treeline. There was about 15 cm of dry new snow above a 15 cm thick supportable melt freeze crust. The new snow seemed to be bonding to the melt freeze crust fairly well. The most concerning layer was the old snow surface which was 45 cm down. This layer propagated about 1/2 way across the ECT on 19 taps and failed on 18 taps from the CT. All the wet new snow is adding a lot of strength to the upper snowpack at this elevation and helping to bury those persistent weak layers.
Melt water runnels on the surface at 1000' along with a 5cm breakable melt freeze crust : )
Snowpack structure at 2200' on Tincan. Very thick and strong layer of melt freeze snow about 15 cm down from the recent warm storm.
Visibility improved slightly in the afternoon and some parties were skiing on Tincan Common.
Avalanche debris at about 2200' on the NW aspect of Magnum
Natural avalanche on the SE aspect of Seattle ridge across from the Sunburst parking lot.
Two more natural avalanches on the SE aspect of peak 4940'. Both starting around 3500' and running out to treeline.
Natural avalanche on S aspect of peak 4940' at about 3500'