How far from their jurisdiction must controllers advise pilots of hazardous weather?

Controllers are required to advise pilots of hazardous weather conditions that may affect their flight path, even when those conditions are outside of their jurisdiction. The distance for such advisory action is established as 150 nautical miles (NM). This is based on the need for pilots to have timely and relevant information for decision-making and ensuring safety as they navigate through or around adverse weather.

Advising pilots at this distance allows for adequate reaction time and planning for any reroutes or altitude changes necessary to avoid dangerous conditions. The specific 150 NM threshold is designed to provide a safety buffer and ensure that controllers extend their vigilance beyond their immediate area of responsibility to maintain overall flight safety in the airspace system.