Abstract
The Met. Office (UK NMS) has operated a VLF ‘arrival time difference’ thunderstorm location system since 1986. This system's hardware is currently being upgraded and its software enhanced. Hardware improvements will allow the system to operate automatically and increase the number of lightning strokes that may be processed per hour to between 10000 to 12000, improving the system's detection efficiency. Software enhancements will enable flash type (cloud to ground or cloud to cloud), stroke polarity, stroke strength and the number of strokes per event to be determined for lightning occurring over the UK. A VLF propagation model is also being developed to calculate more realistic waveform group velocities with the aim of improving the location accuracy of the system under certain conditions.
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