What information must a controller include in a PIREP, alongside the type of aircraft and altitude?

In a pilot report (PIREP), it is crucial for a controller to include the time of the observation because it provides context regarding the conditions that were experienced by the aircraft. The time helps other pilots and controllers understand when the reported information is relevant, particularly in the context of rapidly changing weather conditions, potential turbulence, or other situational factors that might affect flight safety.

Including the time is essential for situational awareness and decision-making in aviation. It allows for an accurate assessment of how current the information is, which is particularly important in a dynamic environment where conditions can change quickly. For instance, knowing that certain weather phenomena were reported at a specific time can help subsequent aircraft anticipate what to expect during their flight.