A new component of th Jovian radio spectrum has been observed by the plasma wave instruments on Voyagers 1 and 2 at frequencies ranging from about 10 to 56 kHz or higher. This Jovian kilometric radiation is characterized by storms of emissions lasting typically 45 minutes at 56.2 kHz, however some events persist for as long as four hours. The storms usually exhibit impulsive bursts with time scales of a few seconds to several minutes, although some events show smoothly varying intensities as a function of time. High resolution frequency-time spectrograms reveal a continuum-like background with more intense, narrowband features superimposed. The narrowband, or discrete, features tend to decrease in frequency with increasing time, falling ~1 kHz in 5 to 60 seconds. The maximum power emitted assuming an isotropic radiator near Jupiter and a bandwidth for the most intense bursts of ~10 kHz is about 109 watts. The Jovian kilometric radiation is most likely observed within ¿45¿ of 200¿ System III longitude, &lgr;iii, although there is a secondary maximum near &lgr;iii=25¿.