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National Radar - The precipitation pattern during the strong low-pressure system of November 1998 can be seen in the animation. Note the counterclockwise motion of the precipitation as the cyclone moves from west to east. Heavier precipitation is indicated by the warmer colors (red, yellow). Winter-type precipitation is falling over the North-Central States during this animation and the line of precipitation extending down to the Gulf Coast indicates thunderstorms and rainfall found along a front.

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