Whitewater back country

We had nice turns in the whitewater backcountry. Noted widespread surface hoar to 10mm in size between 1600 and 2250 meters. This is getting buried now and may become our next problem. We dug a profile at 2070 meters on a south aspect and found repeatable sudden plan results down 40 cm’s on what we assumed was the Jan 3 SH layer. The HS at this location was 220 cm’s. The Dec 26 MFCr was down about a meter, was knife hard and had facets below it.