What distinguishes SIGMETs from AIRMETs?

SIGMETs are specifically designed to communicate information about severe and extreme weather conditions that can significantly affect the safety of aviation operations. They provide warnings about phenomena such as thunderstorms, tornadoes, or volcanic ash that pose a serious threat to all aircraft types. The information contained in SIGMETs is crucial for pilots to make informed decisions, as it relates to hazardous weather that requires immediate attention.

In contrast, AIRMETs focus on less severe weather conditions. They provide information about weather phenomena that are significant but not necessarily severe enough to warrant a SIGMET. AIRMETs are intended for use by all aircraft and are more applicable to general weather considerations. Therefore, the distinction between SIGMETs and AIRMETs lies in the severity of the conditions they monitor and report.