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EARTH SCIENCE > CLIMATE INDICATORS > LAND SURFACE/AGRICULTURE INDICATORS > DROUGHT INDICES > PALMER DROUGHT SEVERITY INDEX

Definition:
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.

Reference:
Palmer, W.C., 1965: Meteorological Drought Research Paper 45, U.S.
Weather Bureau, Washington, D.C.
From: American Meterological Society, 2000: The Glossary of Meteorology, 2nd
edition, Boston, MA
See also http://www.drought.noaa.gov/palmer.html