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<br /> <br />0.3 <br />0.2 <br />0.1 <br /> <br /> <br />A <br /> <br />AMO ==> mean N. Atlantic <br /> <br /> <br />-0.1 <br />-:0.2 <br /> <br /> <br /> <br />+PDO +AMO <br /> <br /> <br /> <br /> <br /> <br /> <br />-PDO +AMO <br /> <br />1960 1980 2000 <br /> +PDO -AMO <br /> <br /> <br /> <br />-AMO <br /> <br /> <br />-PDO <br /> <br />USGS. 2004 <br /> <br />drought frequency <br /> <br />25 % = norma <br />