If Wu is really surprised, then he's never lived in Cleveland, Buffalo, Chicago or any other area near the Great Lakes.
Lake effect precipitation near (and especially downwind) large inland bodies of water is about as predictable as the sun rising in the east.
Somehow, I have to wonder just how much effect Three Gorges will really have:
~3 X the acre-footage of Shasta Lake;
~1/4 the surface area of Salt Lake.
OTOH, Lake Eire is ~5-6 times the surface area of Salt Lake, as well as much deeper.