In this context, the Palmer Drought Severity Index (PDSI) showed a trend of + 0.34/century, finding an increase in the drought risk in several areas such as in the Southwest and Southeast (Ge et al. 2016 ; Apurv and Cai, 2021 ), the Northwest and the Northern Great Plains (Ge et al. 2016 ).
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Temperature and precipitation in the US states: long memory, persistence, and time trend.
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