Here is an excellent example of summertime lake-effect or as some might refer to it “anti” lake-effect. That is because at this time of the year daytime air temperatures get much warmer than the adjacent water temperatures of the lakes. In conditionally unstable airmasses, the cooler lakes will suppress cloud growth as well as convection/thunderstorms. In fact, there is some truth to the comment that the lakes may actually protect areas downwind from severe weather in the summer.
In the main image above, you see a satellite image, which shows cloud free lakes. The important image is the first one below; those are radar echoes surrounding Lake Erie and the red blobs are thunderstorms, which are almost all completely over land. Notice the air temperatures are close to 90F in many areas while Lake Erie’s water temperatures are in the upper 70s to low 80s.