Friday, October 31, 2014

National Drought Mitigation Center

Comparison of Major Drought Indices: Standardized Precipitation Index

Overview: The SPI is an index based on the probability of precipitation for any time scale.

Who uses it: Many drought planners appreciate the SPI’s versatility.

Pros: The SPI can be computed for different time scales, can provide early warning of drought and help assess drought severity, and is less complex than the Palmer.

Cons: Values based on preliminary data may change.

Developed by: T.B. McKee, N.J. Doesken, and J. Kleist, Colorado State University, 1993.

Monthly maps: generated by the National Drought Mitigation Centerat the Western Regional Climate Center.

Daily Gridded SPI: http://drought.unl.edu/MonitoringTools/DailyGriddedSPI.aspx

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