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2.5-deg NCEP-NCAR Reanalysis plots of 925-hPa dilatation axes [bars, length proportional to magnitude of resultant deformation, plotted for values greater
than 1 deformation unit (10-5 s-1) only], wind speed (shaded in m s-1), potential temperature (black contours, every 2 K), and ascent (dashed green contours, every 1 x 10-3 hPa s-1)
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