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Meteorological Impact Statements (MIS)

     Meteorological Impact Statement (MIS). A MIS is an unscheduled flow control and flight operations planning forecast. It is a non-technical forecast and briefing product for personnel at Air Route Traffic Control Center (ARTCC), Air Traffic Control Systems Command Center (ATCSCC), Terminal Radar Approach Controls (TRACONS) and Air Traffic Control Towers (ATCTs) responsible for making flow control-type decisions. The MIS details weather conditions expected to adversely impact air traffic flow in the CWSU area of responsibility, and is valid up to 12 hours after issuance time. The MIS may be effective immediately for existing conditions when CWSU operations begin, or for rapidly deteriorating conditions, or up to two hours in advance of expected conditions.

     An MIS provide's additional information on the current or expected weather information and is tailored to meet the unique requirements of the host ARTCC. These special requirements are coordinated between the host ARTCC and the CWSU.

     A MIS enables ATC facility personnel to include the impact of specific weather conditions in their flow control decision making. Before issuing a MIS, the CWSU meteorologist must ensure forecast conditions triggering the MIS reflect meteorological consistency with other products, such as those issued by the Aviation Weather Center (AWC), other national centers, and the Weather Forecast Offices (WFOs).