Is this the NOAA North Tropical Atlantic Index, as described here?
It seems to match your description.
http://iridl.ldeo.columbia.edu/maproom/ENSO/Time_Series/NATL.html
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Is this the NOAA North Tropical Atlantic Index, as described here? http://iridl.ldeo.columbia.edu/maproom/ENSO/Time_Series/NATL.html 1 comment
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@moh_kohn
Perhaps not: here's another view of that same index that doesn't seem to match the posted data:
https://stateoftheocean.osmc.noaa.gov/sur/atl/tna.php