GOES-East GeoColor satellite image (True Color daytime, multispectral IR nighttime), courtesy of GOES/NESDIS

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Composite radar image, courtesy of the College of DuPage

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Surface observations, courtesy of the NWS Weather Prediction Center

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Surface fronts, pressure systems, and radar, courtesy of The Weather Channel

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Surface observations, courtesy of the Oklahoma Mesonet

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Norman, Oklahoma sounding, courtesy of NCAR

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250-mb upper-air analysis, courtesy of NCAR

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500-mb upper-air analysis, courtesy of NCAR

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700-mb upper-air analysis, courtesy of NCAR

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850-mb upper-air analysis, courtesy of NCAR