1. An electronic display processor for an avionic weather radar system comprising: at least one input for receiving electronic aircraft data providing aircraft heading, and for receiving radar scan data providing for echo information at a plurality of scan angles and ranges; at least one output for outputting a graphical representation of at least a portion of the radar scan data mapped to a display angle and display range; and an electronic computer communicating with the input and output devices and executing a stored program to correct a display angle of echo information in the graphical representation according to any change in a heading of the aircraft between a time of acquisition of the radar scan data and a time of outputting of the graphical representation.