The Evaporative Demand Drought Index (EDDI): A Brief Overview and Discussion

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Predicting the onset, severity, and duration of drought remains a challenge due to the number of interconnected variables that contribute to drought evolution and recovery (e.g., soil moisture, soil type, vegetation, land-use, topography, antecedent vegetative state/stress levels, and atmospheric circulation).  The interactions among these variables span spatial and temporal scales, increasing the complexity of drought prediction.

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