File name: ENSO_Rossby_wave.png
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When a Rossby wave perturbs the Northern Hemisphere mid-latitude jet stream, warmer, high-pressure air is transported poleward into the wave crests, and cooler, lower-pressure air is transported equatorward into the troughs. The jet stream becomes a waveguide, steering the oscillation of the Rossby wave. NOAA Climate.gov image.