They’d followed the spike along the rim of the great high. It was a long, ropy, eccentric F-2, and it had moved, with particular oddity, from the north toward the southwest, a very unusual storm track for Tornado Alley. The F-2 had been exceptionally long-lived, never achieving true earthshaking power, but sipping some thread of persistent energy from the edge of the high. And there had been hail with it, nasty, black, dust-choked hail; but scarcely a drop of rain.