Cold water is heavier than warm water. When the wind blows hard enough and long enough from the east or north east it "slides" the warm water inside and to the west. When all the warm water is gone the wind pushes the denser cold water in the same direction. Because it is so much heavier than the warm water the cold water bull dozes the warm water to the west and around the western end of the lake. Quite literally, the warm water you were fishing in off Rochester last week will probably have done a full circle around the lake by tomorrow. Believe it or not, upwellings are good for the lake. They redistribute oxygen and nutrients and bait fish. Kind of like rebooting your computer.
However, for those of us that are fishing everyday and have been spoiled with half mile runs all summer.....it sucks! I went to the 30 line out of the Oak this afternoon. First time in two years!!!