What best describes the purpose of issuing a PIREP?

The primary purpose of issuing a PIREP, or Pilot Report, is to report weather conditions experienced during flight. PIREPs serve as an essential means of communication between pilots and air traffic control or meteorological services, providing real-time data that reflects the actual weather conditions in specific areas. This information can include reports of turbulence, icing, cloud bases and tops, visibility, and other significant weather phenomena relevant to flight safety.

Pilots generate PIREPs based on their firsthand experience and observations, allowing for a more accurate and timely sharing of weather information than what may be available from other sources. This real-time data is critical for other pilots and meteorologists as it helps to enhance flight planning and operational safety across all flights.