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2.5-deg NCEP-NCAR Reanalysis plots of 200-hPa meridional wind anomalies (departure from a long-term 15-day mean; shaded
in m s^-1), 250-150-hPa layer-mean PV (solid black contours, every 1 PVU), 250-150-hPa layer-mean irrotational wind (vectors, values above 4 m s^-1 only), and
700-hPa omega (solid red contours, every 3 x 10-3 hPa s^-1, negative values only)
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