Hello,
i will try this today.
At the moment i've played some missions, some with rain, some with normal weather, and in all missions this happens.
In other games i have not seen such artifacts and i am playing games some years old and new ones in a nice mixture (Dungeon Keeper 2, World in Conflict, C&C3, WipeOut2097, Fifa 2008 etc) and in no game there are this texture-problems.
I will also test with 3DMark and then send you some new screenshots during the weekend.
With best regards,
Michael