...I gave you a reference, " INTERACTION BETWEEN SNOW METAMORPHISM AND CLIMATE: PHYSICAL AND CHEMICAL ASPECT", where it is state that metamorphosis of snow by humidity is important in avalanches...
Do I insult you?...But you insult people, like the person trap in Mt Jackson because she underestimate the power of the wind in her way back and stayed a live because she had the skill and intelligence to stay in a shade area.
I don't know why I keep trying.WARNING: SERIOUS SNOW GEEK TALK COMING BELOW!
You are talking about TWO different processes, confusing the transfer of vapor pressure "humidity" WITHIN
the snowpack and the additional load on the snowpack of humidity from the ATMOSPHERE
(surface hoar, and negligible for "weight" reasons).
The first is important as it is the main process that will determine whether the layers are faceting or rounding. Without digging a full snow profile and taking the temperature gradient for the entire snowpack the easiest way to figure out what is probably happening is depth/air temp.
Deep (more than a meter) and warm (32+) promote rounding
Shallow (less than a meter) and COLD promote faceting
Neither adds weight to the snowpack, as I have already explained. It does shift where the mass in each crystal goes to. Rounding crystals actually don't loose or gain mass, but they shift mass from the sharper ridges to the valleys, making the grain more "round". As I said this creates a stronger layer, which may be a dangerous slab IF it is sitting on a weaker layer (like facets/surface hoar).
If ANYTHING the snowpack will lose some mass through sublimation
during this whole process, though top layers will feel heavier as they compress, they have gained NO mass from atmospheric humidity.
"metamorphosis of snow by humidity is important in avalanches" - Yes... you are correct, all I am saying is it is not making the snowpack "heavier", perhaps more or less dense based on what I said above, but atmospheric humidity ONLY comes into play in the formation of Surface Hoar, which can be a very dangerous buried weak layer, but adds no noticeable "weight" to the snowpack... so I think we both agree, but the way it is explained can be tricky.
Reference: The Avalanche Handbook, 3rd Edition, considered the best technical book on the subject (and hundreds of hours taking courses through Level 3 AIARE, and spending time in workshops and seminars dedicated to snow science.)http://www.amazon.com/The-Avalanche-Handbook-David-McClung/dp/0898868092/ref=dp_ob_title_bk/191-8247558-6921602
And as for the Jackson lady, all I said was if she had a map & compass she could have walked herself to safety in 1 hour 45 minutes... better than spending the night out in those temps... but she kept her head and stayed alive. Not insulting her, simply stating what is COMMON knowledge. Map & Compass are the first two items on every gear list... how is that insulting?