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High is at the surface, the trough is aloft. High comes down the back side of the trough. http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/namer/gfs/18/images/gfs_slp_060m.gif http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/namer/gfs/18/images/gfs_500_060m.gif |