$ cat /dev/random | tee >(aplay -r 8000) | tr -c 'ox0.@' ' '

If you really want to conjure a howling blizzard (R.I.P headphone users though)

Nice. Here's a version with snow falling down instead of up.

clear ; while true ; do tput cup 0 0 ; tput ri ; head -n 1 /dev/random | cut -c "1-$COLUMNS" | tr -c '.,x*oO@'$'\n' ' ' ; done

oh I love this!