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2.5-deg NCEP-NCAR Reanalysis plots of 600-400-hPa layer
averaged ascent (dashed green, every 2 x 10-3 hPa-1), and 250-150-hPa
layer-averaged wind (shaded every 10 m s-1 starting at 40 m s-1),
potential vorticity (solid blue, every 1 PVU starting at 1 PVU), irrotational wind (vectors in m s-1, values above 3 m s-1 only), and
potential vorticity advection by the irrotational wind (red contours, every 10-5 PVU s-1, negative values dashed, positive values solid, zero
line omitted).
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