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Click the image to see a larger version. The Standardized Precipitation Evapotranspiration Index (SPEI) is an extension of the widely used Standardized Precipitation Index (SPI). The SPEI is designed to take into account both precipitation and potential evapotranspiration in determining drought. Negative values are dry. Positive values are wet. More information |
Click the image to see a larger version. Drought characteristics compared for historical vs. mid-21st century. More information |