Anticyclonic Aftermath

Iowa State University meteorology student and storm chaser Bryce Link observes a turbulent area of the sky that moments before contained a possible anticyclonic (clockwise) RFD spin-up. The spin-up was located on the backside of a mesocyclone that was moving away toward the upper right of this image. The spin-up was not making an audible sound to our chase group. The main vortex, later rated at EF3, was positioned over the town of Mapleton, Iowa about 4.7 miles northwest of this location at Sumac Avenue (foreground) and 170th Street. Shot at 7:32 PM, Saturday, April 9, 2011.