Analysis of data from lightning-flash counters

Data from observations with lightning-flash counters in England and Singapore show the diurnal and seasonal variations, and comparisons are made with the established observations of thunderstorm days. Estimates of radio noise to be expected from local storms are compared with noise measurements made at the same times, and, from the discrepancies which occur, it is concluded that some measured daytime noise values may be considerably too low at medium frequencies. Possible uses of counter data in studies of radio noise are discussed.