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<br />Does the interaction of AMO with PD~ <br />produce two families of drought? <br /> <br />Observed PDSI <br />(Fye et al. 2003) <br /> <br />I nslrum enta I PDSI <br /> <br />Drought frequency <br />(McCabe et al. 2004) <br />AMO (+) <br /> <br /> <br /> <br />PD~ (+) <br /> <br /> <br /> <br />PD~ (-) <br /> <br />DRY WET <br /> <br /> <br />. I <br />:o! -1.5 -1.0 4>.5 0,5 1.0 ~1.5 <br /> <br />Red: Higher probability of drought <br />Blue: Lower probability of drought <br />. USGS <br /> <br />Courtesy, Hugo Hidalgo <br />