A mesoscale convective system (MCS) has been impacting many from St. Louis to the Deep South on Monday, sliding hundreds of miles in a matter of hours.

MCSs tap into heat and abundant moisture to keep their energy flowing. They can drop heavy rain within the thunderstorms very quickly, sometimes causing flash flooding. The WeatherRadar shows Monday's system.

The system has become more bowed and more organized as it has come in contact with a warm, water-laden environment in the Deep South.

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