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700-500 hPa PV, 600 hPa PSI, and 850-700 hPa MFLUX

Caption:
+850-700 hPa layer-averaged moisture flux (arrows with magnitude shaded according to the color bar in mm m/s).
+600 hPa streamfunction (black contours every 6.0x10⁶ m² s^-1).
+700-500 hPa layer-averaged potential vorticity (solid red contours every 1.0 PVU starting at 1.0 PVU).
+Image was generated from 1.0x1.0^o NCEP-GFS data. The moisture flux was computed by multiplying the 850-700 hPa layer-averaged wind by the total column precipitable water using the assumption that the bulk of atmospheric moisture resides in the lower troposphere.
+The latitude-longitude lines are every 15^o centered on the central point of 30^oN/165^oE.