A new mesocyclone developed on the front flank of a fast-moving, mean, nasty, heavy-precipitation supercell, then raced past us to the NW and N. For a short while, the rotating but ragged wall cloud area wasn’t wrapped completely in rain yet, and this brilliant CG split the fading daylight. My satisfaction with seeing this–at least our fourth supercell of the day in western Iowa–later was dampened when I learned that a previous mesocyclone from the same storm had produced the killer tornado at the Little Sioux Scout Ranch.
6 S Denison IA (11 Jun 8) Looking NW
41.9226, -95.3494