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follows a normal distribution, wet and dry climates can be represented and monitored using this index. An SPI value equal to zero means that the corresponding monthly precipitation represents 50% of the cumulative gamma distribution. SPI values ranging from −1 to +1 represent a normal amount (68%) of probability and values out of this range represent relevant deviations from the normal regime. Qualitatively, SPI values ranging from −2 to −1 (13.6% of cumulative probability) are associated with
follows a normal distribution, wet and dry climates can be represented and monitored using this index. An SPI value equal to zero means that the corresponding monthly precipitation represents 50% of the cumulative gamma distribution. SPI values ranging from −1 to +1 represent a normal amount (68%) of probability and values out of this range represent relevant deviations from the normal regime. Qualitatively, SPI values ranging from −2 to −1 (13.6% of cumulative probability) are associated with
. Feng , 2008 : Variation of the North American summer monsoon regimes and the Atlantic multidecadal oscillations. J. Climate , 21 , 2371 – 2383 . Kalnay , E. , and Coauthors , 1996 : The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc. , 77 , 437 – 471 . Keyantash , J. , and J. A. Dracup , 2002 : The quantification of drought: An evaluation of drought indices. Bull. Amer. Meteor. Soc. , 83 , 1167 – 1180 . Kiehl , J. T. , J. J. Hack , G. Bonan , B. A
. Feng , 2008 : Variation of the North American summer monsoon regimes and the Atlantic multidecadal oscillations. J. Climate , 21 , 2371 – 2383 . Kalnay , E. , and Coauthors , 1996 : The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc. , 77 , 437 – 471 . Keyantash , J. , and J. A. Dracup , 2002 : The quantification of drought: An evaluation of drought indices. Bull. Amer. Meteor. Soc. , 83 , 1167 – 1180 . Kiehl , J. T. , J. J. Hack , G. Bonan , B. A
