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GFS - EU - Rel Hum/Show - 4.5day Inverted

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GFS - EU - Rel Hum/Show - 4.5day Inverted
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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.