What is the first piece of information listed in a PIREP?

In a Pilot Report (PIREP), the first piece of information typically listed is the time of the observation. This is important because it establishes the context of the weather conditions being reported and allows air traffic control and meteorologists to correlate the information with other reports and forecasts. Accurate timing is crucial for safety and operational efficiency as it helps in tracking weather changes and planning accordingly.

The particular time of the observation is also essential for situational awareness among pilots and air traffic controllers, enabling them to assess the relevance and accuracy of the data in relation to other reports, especially in a dynamic environment where conditions can change rapidly.