Eta 925 mb Fgen and 850-700 mb Sat EPV, at 12z, 09/17

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A plan view of Eta 0-hr 2-D frontogenesis at 925 mb (green contours) and mean layer saturated EPV from 850 to 700 mb (with weakly stable (just above zero) and unstable (negative) values shaded), valid at 12z, 9/17/04. The collocation of strong frontal-scale forcing and elevated instability matches up well with heavy rainfall on composite radar images at this time.