Scientists know that urbanization and irrigation can significantly influence rainfall. However, they don't fully know how these effects vary among different types of rain. Researchers have investigated how large-scale urbanization and irrigation in the United States affect the three dominant types of summer precipitation in the mid-Atlantic region. These include mesoscale convective system (MCS), isolated deep convection (IDC), and non-convective (NC) precipitation. MCS precipitation is from large systems of thunderstorms.