Interesting topic. Michigan has plenty of corn fields and foliage so the difference there is negligible. Great lakes and front timing definitely have a bit to do with it. My observations is pattern in which drought/dry areas have a lot to do with it. When the OV and upper Mississippi valley are dry to drought conditions then MBY tends to get great thunderstorms (2021 is a great example). In simple if IA, IN, IL and WI are having a rocking summer then normally MBY isn't. When they are complaining in this banter thread about dryness are normally my best storm summers. No it is not always a sure bet to work out that way (it's the weather). I look for a specific pattern that works more times than not for MBY.