He sent this explanation:

It was tough photographing them in the dark last night when they were 20 feet high so I went back this morning at sunrise to find big sets of 15 foot+ waves rolling in. The waves are pounding the seawall still and freezing spray covers everything (including my camera after a few exposures).

Get down there and check it out if you can!

Just wonderful, that's Chicago fishing conditions.

Harris does a nice blog, Great Lakes Angler, too.