The Doppler on Wheels truck DOW 7 raises its antenna in southwestern Iowa, May 31, 2009. DOW 7 is the mobile command post during Vortex 2 operations -- the 50 foot tall antenna facilitates radio communications in the area...Project Vortex 2 is a two year National Science Foundation funded science mission to study tornadoes and supercell thunderstorms. Shot May 31, 2009, in southwestern Iowa.