For which area are Convective SIGMETs issued?

Convective SIGMETs are specifically issued for significant convective weather phenomena, such as thunderstorms and related hazards, that may occur within defined geographical areas. These areas primarily focus on the lower 48 states of the United States, where the majority of air traffic operates and where such weather can have substantial impacts on aviation safety.

The reason the lower 48 states is the correct context for the issuance of Convective SIGMETs is because they are intended to provide timely information to pilots and air traffic controllers about significant convective activity that could affect flight operations in these densely traveled regions. This includes severe thunderstorms, tornadoes, and conditions that could lead to turbulence or low visibility.

While Convective SIGMETs do not cover the entire country, Alaska, Hawaii, or international waters, the focus is mainly on those areas with the most impact on commercial aviation, which significantly narrows down the effective range of the warnings issued.