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| MODEL | GFS | GFSx | TYPE | Norm | Inv | TIME | 6panel |
| PLOT | 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.