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File: how-negative-pna-days-connect-enso-and-tornadoes-scatterplot.png

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Alternate Text: Scatterplot with colored dots showing how La Niña correlates with a greater frequency of days with negative PNA
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Scatterplot with colored dots showing how La Niña correlates with a greater frequency of days with negative PNA

Image caption

Same as above, but with color added to the dots to show the relative fraction of PNA-negative days in that season compared to average. Green means fewer negative-PNA days than average; pink means more frequent negative-PNA days than average. Springs with La Niña (blue shading) are more likely to have a higher-than-average fraction of days with a negative PNA (pink) value. NOAA Climate.gov, adapted from original by Kelsey Malloy.