What is an unscheduled planning forecast describing conditions expected to begin sometime within the next 12 hours which may impact the flow of air traffic in a specific center's ( ARTCC ) area?

• A. AIRMET
• B. MIS
• C. CWA
• D. SIGMET

Answer: (B)

The key idea is planning information for air traffic flow. A Meteorological Impact Statement describes weather that is expected to begin within the next 12 hours and could impact how a Center (ARTCC) manages traffic. It’s used for planning and coordination, helping facility operations anticipate likely disruptions, delays, or rerouting needs before they happen.

This contrasts with other products that serve different purposes: AIRMETs warn about moderate, less severe weather for flight crews, SIGMETs warn about significant, hazardous weather affecting safety, and Center Weather Advisories are short-term, urgent advisories for conditions likely to affect operations within the next couple of hours. The 12-hour planning horizon and focus on center-level operational impact make MIS the best fit.