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Hand-analyzed surface map at 7 pm cdt Wednesday evening. Labeled are an important pre-existing thunderstorm outflow boundary in blue, and the location...Hand-analyzed surface map at 7 pm cdt Wednesday evening. Labeled are an important pre-existing thunderstorm outflow boundary in blue, and the location of where the supercell developed in southeastern Chase County (pink 'X'). Also noted are a weak surface low (meso-low) in red, and a cold front. Dewpoint temperatures (deg F) are in green contours, with mean sea-level pressure contours (mb) in black.

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