Hazardous Inflight Weather Advisory Service (HIWAS) provides continuously updated hazardous weather within how many nautical miles of selected VORs?

• A. 50 NM
• B. 100 NM
• C. 150 NM
• D. 200 NM

Answer: (C)

HIWAS provides continuously updated hazardous weather information within 150 nautical miles of selected VORs. This service broadcasts advisories such as SIGMETs, AIRMETs, convective SIGMETs, and other urgent weather information that pilots rely on while en route, helping with planning and in-flight decisions between separate weather briefings. The 150 NM radius is the standard coverage for HIWAS, which is why this distance is the correct choice.