Which of the following should be included in an urgent PIREP?

An urgent Pilot Report (PIREP) is designed to communicate information about significant weather phenomena that can affect flight safety. In this context, low-level wind shear is a critical condition that can pose serious risks to aircraft during takeoff and landing. Wind shear can cause sudden changes in wind speed and direction, significantly impacting the aircraft's performance and control.

Reporting this type of phenomenon as "urgent" is crucial because it informs other pilots and air traffic control about potential hazards that could directly influence flight operations.

While light rain showers, clear air turbulence, and cloud cover may have implications for flight safety, they typically do not reach the same level of urgency as low-level wind shear. Clear air turbulence is often encountered during flight but may not result in immediate, severe impacts like low-level wind shear does. Cloud cover, although important for visibility, usually does not warrant an urgent PIREP unless associated with severe weather conditions. Therefore, low-level wind shear is rightly highlighted as a top priority in urgent reports.