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| MODEL | NGM | Eta | GFS | GFSx | TYPE | Norm | Inv |
| TIME | Init | 12h | 24h | 36h | 48h | 60h | 3d | 3.5d | 4d | 4.5d | 5d | 5.5d | 6d | 6.5d | 7d | 7.5d | 8d | 8.5d | 9d | 9.5d | 10d | 9panel | Loop |
| PLOT | 500 mb Hght/SLP | SL Pres/Prec | 1000 mb | 850 mb | 700 mb | 500 mb | 300 mb | Rel Hum/Show | 4 Panel |
The Relative Humidity/Showalter Index chart depicts two fields: integrated relative humdity from 850 to 500 mb (in color contours) and Showalter index (in white line contours). Negative index values are shaded black.