May I add to that?
Except for this year, we've seen a very steady decline in the ice cover of the lakes. Much of the evaporation from those lakes occurs in the winter period. You see a lot of water going into the atmosphere from the lakes in the cold season. If you have them covered with ice, that doesn't happen; but if you have them open, it happens much more frequently. That has contributed, along with other things, to the decline of the level of Lake Michigan and Lake Huron. The surface water temperatures are going up as well, and we're seeing more runoff with increased frequency of heavy rain and snowmelt periods in the changing climate.