What type of weather report is required to be issued during severe icing conditions not associated with thunderstorms?

• A. AIRMET
• B. SAFETY ALERT
• C. WIND ADVISORY
• D. SIGMET

Answer: (D)

The correct answer is SIGMET. A SIGMET, or Significant Meteorological Report, is specifically designed to provide information about hazardous weather conditions that can significantly affect aircraft operations, particularly in flight. When severe icing conditions occur that are not associated with thunderstorms, issuing a SIGMET alerts pilots and air traffic controllers about the potential danger.

This type of report includes information relevant to severe weather phenomena such as icing, turbulence, volcanic ash, and other hazards that could pose risks to aviation.

The other types of reports, while related to weather, serve different purposes. An AIRMET is intended for less severe weather phenomena that may still be significant for aircraft operations, but it is not used for severe icing events. A SAFETY ALERT is more general and not a formal weather report, typically used to communicate urgent safety information. A WIND ADVISORY relates specifically to wind conditions and does not address icing issues at all. Thus, for severe icing conditions, a SIGMET is the appropriate and required report.