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<br />Eastern tropical <br />Pacific sea-surface <br />temperatures <br />(SSTs) were cool <br />and North Atlantic <br />Ocean SSTs were <br />warm for each of <br />the major u.s. <br />droughts during <br />the last century. <br /> <br />Annual SST Anomalies <br /> <br /> <br />, <br /> <br />-0.8 -0.4 0.0 0.4 0.8 <br />Standardized Departure <br /> <br />. USGS <br />