A self-calibrating Palmer Drought Severity Index

Nathan Wells, Steve Goddard, Michael J. Hayes

Research output: Contribution to journalArticlepeer-review

905 Scopus citations


The Palmer Drought Severity Index (PDSI) has been used for more than 30 years to quantify the long-term drought conditions for a given location and time. However, a common critique of the PDSI is that the behavior of the index at various locations is inconsistent, making spatial comparisons of PDSI values difficult, if not meaningless. A self-calibrating Palmer Drought Severity Index (SC-PDSI) is presented and evaluated. The SC-PDSI automatically calibrates the behavior of the index at any location by replacing empirical constants in the index computation with dynamically calculated values. An evaluation of the SC-PDSI at 761 sites within Nebraska, Kansas, Colorado, Wyoming, Montana, Nonh Dakota, and South Dakota, as well as at all 344 climate divisions shows that it is more spatially comparable than the PDSI, and reports extreme wet and dry conditions with frequencies that would be expected for rare conditions.

Original languageEnglish (US)
Pages (from-to)2335-2351
Number of pages17
JournalJournal of Climate
Issue number12
StatePublished - Jun 15 2004
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science


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