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NCEI provides precipitation data that can be used to show probability or the amount of precipitation to ameliorate or end a drought at different monthly scales.

GPCC Drought Index: a standardized anomaly of precipitation and potential evapotranspiration regarding to long-term means.

GPCC Drought Index: a standardized anomaly of precipitation and potential evapotranspiration regarding to long-term means.

The Evaporative Demand Drought Index (EDDI) is an experimental tool that examines how anomalous the atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere") is for a given