“Recent analyses in changes in severe local weather (tornadoes, thunder days, lightning and hail) in a few selected regions provide no compelling evidence for widespread systematic long-term changes“. (Source: IPCC, 2001, TAR-02-2, Chapt. 2.7.4., Summary, S.163-164).




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And here's the full report: http://www.ipcc-wg2.gov/[…]/SREX-All_FINAL.pdf