A Review of Twentieth-Century Drought Indices Used in the United States

  title={A Review of Twentieth-Century Drought Indices Used in the United States},
  author={Richard Heim},
  journal={Bulletin of the American Meteorological Society},
  • R. Heim
  • Published 1 August 2002
  • Environmental Science
  • Bulletin of the American Meteorological Society
The monitoring and analysis of drought have long suffered from the lack of an adequate definition of the phenomenon. As a result, drought indices have slowly evolved during the last two centuries from simplistic approaches based on some measure of rainfall deficiency, to more complex problem-specific models. Indices developed in the late nineteenth and early twentieth century included such measures as percent of normal precipitation over some interval, consecutive days with rain below a given… 

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