Palmer drought severity index

  • Palmer Drought Severity Index
  • The Palmer Index or the Palmer Drought Severity Index (PDSI) is an index formulated by Palmer (1965) and compares the actual amount of precipitation received in an area during a specified period with the normal or average amount expected during that same period.

    The PDSI is based on a procedure of hydrologic or water balance accounting by which excesses or deficiences in moisture are determined in relation to average climatic values.

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