Private Pilot Private Practice Exam

The primary purpose of a SIGMET (Significant Meteorological Information) is to alert pilots of hazardous weather conditions that could affect the safety of their flight. These advisories are crucial for flight planning and in-flight decision-making, as they provide information on severe weather phenomena such as thunderstorms, icing, turbulence, volcanic ash, and dust storms. Being informed about such hazardous conditions helps pilots to take appropriate actions, either by altering their route, altitude, or, in some cases, delaying or canceling a flight in order to ensure safety.

The other options do not accurately reflect the primary role of a SIGMET. Routine weather patterns and general weather changes are typically addressed by METARs and TAFs, and ground weather observations are reported through other means and do not convey the critical threat level that SIGMETs provide. Therefore, the emphasis on hazardous conditions in SIGMETs is what sets them apart and highlights their purpose in enhancing flight safety.