http://www.cpc.ncep.noaa.gov/data/indices/qbo.u30.index http://www.cpc.noaa.gov/data/indices/qbo.u50.index
qbo.u50.index
https://www.cpc.ncep.noaa.gov/data/i.../qbo.u30.index https://www.cpc.ncep.noaa.gov/data/i.../qbo.u50.index
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