Thornthwaite moisture index

A method for monitoring the soil water budget for relatively large areas based on the pioneering work of C. W. Thornthwaite (1948) using the concept of potential evapotranspiration.

The Palmer Drought Severity Index and the companion "crop moisture index," developed by W. C. Palmer, are modifications of the earlier Thornthwaite work.

Thornthwaite, C. W. 1948. An approach toward a rational classification of climate. Geogr. Review. 38. 55– 94.

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