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250 hPa PV, Irrotational Wind, Wind Speed, and Ascent

Caption:
+250 hPa irrotational wind (arrows in m/s).
+250 hPa potential vorticity (solid gray contours every 1.0 PVU).
+600-400 hPa layer-averaged ascent (solid red contours every 0.3 Pa/s starting at -0.3 Pa/s).
+250 hPa wind speed (shaded according to the color bar in m/s).
+Image was generated from 1.0x1.0^o NCEP-GFS data. The PV was smoothed by 20 passes of a 9-point local smoother.
+The latitude-longitude lines are every 15^o centered on the central point of 30^oN/90^oE.