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Do forest fires affect lightning?

Lightning statistics are analysed downwind of forest fires in 1998 and 2000. The previously studied 1998 case shows anomalously high frequencies of positive cloud‐to‐ground lightning (+CG%) in the southern Great Plains region of the USA, coincident with the smoke plume from forest fires in Central America. Fires in the northwestern USA in summer 2000 produced a smoke pall commensurate with the 1998 fires, but were not accompanied by statistically significant lightning anomalies. Analyses of meteorological data reveal that the southern Great Plains region was abnormally dry and hot during the period of anomalous lightning in 1998.