If aircraft on your frequency(s) ______, hazardous inflight weather advisories are not required.

• A. have requested their omission
• B. will not be affected
• C. are on a VFR flight plan
• D. are in your sector or area of control jurisdiction

Answer: (B)

Hazardous inflight weather advisories are provided to pilots when there is a weather hazard that could affect the aircraft operating on your frequency. The key idea is that HIWAS is only required if the traffic you’re handling could be impacted by those hazards.

If the aircraft on your frequency will not be affected by the current or forecast weather hazards, there’s no need to broadcast HIWAS to them. In other words, you’re not obligated to initiate or maintain HIWAS dissemination when there’s no potential impact to the traffic you’re controlling.

Pilots or flight plans don’t automatically determine this: a request to omit HIWAS isn’t a trigger to drop it, and being on a VFR flight plan doesn’t guarantee HIWAS is required or not. Similarly, simply being within your sector doesn’t by itself mandate HIWAS if there’s no hazard affecting that traffic. The decision hinges on whether any aircraft on your frequency could be affected by the weather advisories.