by whit » Wed Mar 24, 2010 11:36 pm
Definitely some of the weirdest snow I have ridden in a long time. I was thinking about the definition of this snow type, because I have seen it before, although rarely. After some more research, I remembered that it is caused by radiation recrystallization. Here is the definition from The Avalanche Handbook, 2006.......
"GROWTH OF CRYSTALS AROUND CRUSTS IN DRY SNOW: The influence of a crust can significantly alter the condition for transport and deposition of water vapor in a dry snow pack. Faceted crystals sometimes form above crusts to produce a future avalanche situation. Radiation recrystallization provides an example. However the presence of crusts, since they are impermeable to vapor transport, can also allow faceted snow to grow immediately BELOW a hard layer even when surrounding crystals are well rounded. Below a crust, extra water vapor present due to blockage causes supersaturation, allowing facets to form."
And did we ever have some HUGE FACETS and hollow, hollow snow down below (hollow and facets are synonymous). This is a technical explanation of the snow we were experiencing. WG