Which description is true about SIGMETs?

Which description is true about SIGMETs?

• A. They warn of minor weather hazards.
• B. They are issued for significant weather phenomena affecting several aircraft.
• C. They only apply to tropical zones.
• D. They are forecasts for the next 24 hours.

Answer: (B)

SIGMETs warn pilots and air traffic controllers about significant weather phenomena that can affect the safety of flight for multiple aircraft over a region. They’re issued when such hazards are occurring or expected to develop and persist, not for minor conditions and not only for tropical areas. They aren’t forecasts for the next 24 hours; instead, they have a limited validity period (typically up to 4 hours, or up to 6 hours for volcanic ash). This makes the description that they are issued for significant weather phenomena affecting several aircraft the best fit.

SIGMETs warn pilots and air traffic controllers about significant weather phenomena that can affect the safety of flight for multiple aircraft over a region. They’re issued when such hazards are occurring or expected to develop and persist, not for minor conditions and not only for tropical areas. They aren’t forecasts for the next 24 hours; instead, they have a limited validity period (typically up to 4 hours, or up to 6 hours for volcanic ash). This makes the description that they are issued for significant weather phenomena affecting several aircraft the best fit.