What does the acronym PIREP stand for?

The acronym PIREP stands for Pilot Report. This term refers to a report made by pilots that provides valuable information regarding current atmospheric conditions during flights. PIREPs include observations of weather phenomena, turbulence, wind shear, cloud conditions, and other elements that are pertinent to aviation safety and operations. They are critical for the dissemination of real-time weather information and can significantly influence flight planning and safety decisions.

The other options do not accurately describe the nature or purpose of PIREPs in aviation. While a 'Preliminary Report' might suggest an early stage of reporting, it lacks the specificity related to pilot observations. A 'Personal Report' does not pertain to aviation context, and 'Performance Report' typically refers to assessments of an aircraft's capabilities or pilot performance rather than real-time weather reporting.