Evolution of the U.S. Tornado Database: 1954–2003

@article{Verbout2006EvolutionOT,
  title={Evolution of the U.S. Tornado Database: 1954–2003},
  author={Stephanie M. Verbout and H. Brooks and L. Leslie and D. Schultz},
  journal={Weather and Forecasting},
  year={2006},
  volume={21},
  pages={86-93}
}
Abstract Over the last 50 yr, the number of tornadoes reported in the United States has doubled from about 600 per year in the 1950s to around 1200 in the 2000s. This doubling is likely not related to meteorological causes alone. To account for this increase a simple least squares linear regression was fitted to the annual number of tornado reports. A “big tornado day” is a single day when numerous tornadoes and/or many tornadoes exceeding a specified intensity threshold were reported anywhere… Expand

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