upwards vs. upward? what's the difference?

[[number]]

also, hi.

[Rover_KE]

Typically, though not exclusively, upward is used adjectivally and upwards adverbially.

You might find this discussion from another board helpful:


http://forum.wordreference.com/showthread.php?t=1234420

Rover

[euncu]

Typically, though not exclusively, upward is used adjectivally and upwards adverbially.

I was thinking that it was about a BrE/AME difference as in toward/towards.
Does something similar apply to upward/upwards?