Why do footprints in the snow fill up as fresh snow falls?
Say a footprint in the snow is an inch deep, measured from the surface. Now, say another inch of snow falls. The bottom of the footprint will now be an inch higher, that is, at the original level of the surface of the snow. But the snow surface is now also an inch higher…
Boadicea's Chariot 
Interesting, Bravo. I cannot explain, but it’s the same principle as water filling a bucket or rain gauge, I would have thought.
In other words, I don’t have a clue. 😦
The footprint gradually fills up with new snow and displaced snow from the sides of the print. A kind of mini-avalanche occurs that eventually levels out thus restoring balance and unity. It was also theorised that, as everyone knows each drop of snow is unique, the new snow drops do not fit snugly like a jigsaw and are thrown into the hole more like a child’s toybox. This quickens the filling process.
Glad to have been of help, Bravo.
vair impressive, Mr Royalist!
Wind
No, I’m not being rude, I mean wind as in breeze, gust, blow etc.
Bravo, interesting! I’ve noticed that when the snow is 2 ft. deep one’s impression doesn’t disappear!
~Snow safety, avoid yellow snow.
It’s not yellow, Rick, it’s amber. Beware of amber snow, especially the bit that reads ‘Zangado’. I woz there although only Hawkeye Weegie might recognise the fact as I leave no trace apart from the signature. Aaoooooohhh!
OZ