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The 2D probability density distributions for daily values of the wave phase speed c and the zonal mean zonal wind (U) at 500 mb aggregated from 35°N to 65°N for days in July−August during 1979–2012 (solid lines) for (A) wave 6, (B) wave 7, (C) wave 8, and (D) the mean distribution for these three waves. Color contours plot the anomaly during resonance months, showing an increase in quasi-stationary flow patterns with reduced zonal mean winds.
