Which weather product is used to alert pilots about weather hazards that is a short-term, unscheduled forecast for ongoing weather within a two-hour window?

• A. PIREP
• B. MIS
• C. CWA
• D. SIGMET

Answer: (C)

Center Weather Advisories provide the short-term, unscheduled forecast that warns pilots about weather hazards expected within the next two hours. They are issued as needed to alert about ongoing or developing conditions—such as thunderstorms, strong winds, turbulence, icing, or reduced visibility—that could affect flight operations. This makes them the most appropriate tool for quick, real-time awareness in the cockpit and for use by air traffic controllers to manage immediate risks.

A PIREP is a pilot-reported observation, not a forecast product, so it reflects current conditions rather than a forward-looking alert. SIGMETs are warnings about significant en-route weather hazards and typically cover more substantial or longer-lasting phenomena, not the brief two-hour window described. MIS is not the standard product used for this specific short-term alert.