 Before the advent of satellite imagery in 1961, however, many tropical cyclones were underestimated in their durations.John is also the longest-tracked tropical cyclone in the Northern Hemisphere on record, with a path of .Cyclone Rewa of the 1993–94 South Pacific and Australian region cyclone seasons had one of the longest tracks observed within the Southern Hemisphere, traveling a distance of over during December 1993 and January 1994.