During May and early June of 2007, a mobile, X-band, phased-array, Doppler radar (MWR-05XP) was used for the first time to probe severe convective storms in the Plains of the U. S. Volume scans were collected in supercells and squall lines every 16 seconds. The radar was scanned mechanically through 360 deg in azimuth and electronically through 15 elevation angles. Results from the first year of testing and plans for the future will be discussed.