What is the first action required when low level wind shear is reported?

When low-level wind shear is reported, the immediate priority is to ensure that all aircraft operating in or approaching the affected area are aware of the potential hazard. Issuing reports to all aircraft allows them to take necessary precautions and adjust their operations as needed to maintain safety. This proactive communication is critical in helping pilots anticipate and respond to unpredictable changes in wind conditions, which can affect their flight dynamics during critical phases such as takeoff and landing.

The other actions listed, while important in their own right, do not address the urgency of informing pilots about the immediate risk posed by wind shear. For example, notifying ground control, activating emergency systems, or surveying runway conditions might be necessary follow-up measures, but they do not have the same immediate impact on flight safety as ensuring that all aircraft are alerted to the presence of wind shear.