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Hovmöller plots

Figure: The Hovmöller plots of equatorial $\Phi _{850hPa}$ from the ECHAM4 model GSDIO integration show a) a long-term increase in the heights and b) west-east/east-west propagating features. [Ferret]

Sometimes, contour plots with one axis along a spatial direction (longitude or latitude) and another along the temporal direction can exhibit propagation.

David Stephenson