I just quickly read 2 things:
1-The emergency covers 6 states: North Dakota, Nebraska, Michigan, Illinois, Kentucky and Maryland.
2-One issue in a September article is an Exxon refinery in Illinois that closed down because of floods. It supplies 11% of the midwest's fuel.
The outages seem scattered and disconnected to me. Here's a 9 minute video discussing the reasons. I did not watch it.
eta: I watched the video. The guy mentioned Omaha shortages, but doesn't really add any information regarding the underlying reasons. It's not worth the watch.