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Thunderstorms

A Strong Squall Line - The sequence of Doppler radar reflectivity images shows the development of a bow echo within a squall line over eastern Missouri/western Illinois. Note the heavy precipitation (red) on the leading edge of the squall line and the development of a bow shape to the line as it approaches St. Louis in the center of the image.

Department of Atmospheric Sciences Severe and Hazardous Weather at Department of Atmospheric Sciences University of Illinois