ETA model initial analyses from 1200 UTC on 28 July 1997.   Analyses are centered over Colorado (lightly shaded in figure).   LEFT:   Sea level pressure analysis with frontal position traced from the National Center for Environmental Prediction (NCEP) difax chart.   RIGHT:   500 mb heights and vertical motion.
        The data show eastern Colorado in a low-level upslope flow pattern following the passage of cold front.   The state is also directly beneath an upper level ridge.   Both conditions are considered favorable for floods.