A moment earlier I’d noticed that wispy clouds now filled the valleys to the south, obscuring all but the highest peaks. Adams—a small, pugnacious Texan who’d gotten rich selling bonds during the booming 1980s—is an experienced airplane pilot who’d spent many hours gazing down on the tops of clouds; later he told me that he recognized these innocent-looking puffs of water vapor to be the crowns of robust thunderheads immediately after reaching the top. “When you see a thunderhead in an airplane,” he explained, “your first reaction is to get the fuck out of there.