You must have more than 1 and less than 33 contour levels. You had a contour interval of 0.5 and a range of -10 to 10 yielding 40 contour levels
This plot is not dissimilar to the PNA

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Dataset time range: 1948 to 2023

Dataset Information: NCEP/NCAR Reanalysis

Date submitted: 12/9/2023 at 11:00