Eta 925 mb Fgen and 700 mb Sat EPV, at 12z, 09/18

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A plan view of Eta 0-hr 2-D frontogenesis at 925 mb (green contours) and saturated EPV at 700 mb (with weakly stable (just above zero) and unstable (negative) values shaded), valid at 12z, 9/18/04. The collocation of strong frontal-scale forcing and elevated instability matches up well with observed heavy rainfall at this time.