Every five minutes a new radar picture came in, and the storms were building as well as moving toward the northeast. Dubuque would no longer work, but Madison, Wisconsin, looked okay. The Madison approach controller was great and let me pick my way through some broken buildups that were starting to pop and then turn east toward Muskegon, Michigan. My new plan, and clearance, was to land at Muskegon for fuel. But, again, the XM picture changed that. Cells were moving up Lake Michigan fast, and they would be over Muskegon before I could get gas and depart. The new plan was Flint, Michigan, well to the east of the cold front where it was 60º F, with drizzle so light that it didn't show on the Nexrad picture. A VOR approach into Flint, top the tanks, and I had an uneventful second leg home to New York with absolutely nothing to look at ahead on the Nexrad.