Convective SIGMETs are valid for how long?

Convective SIGMETs are valid for how long?

• A. 2 hours
• B. 1 hour
• C. 6 hours
• D. 3 hours

Answer: (A)

Convective SIGMETs are valid for two hours from the time of issue. This two-hour window reflects the forecast horizon for convective hazards, since thunderstorms can develop or dissipate quickly. If the weather is expected to persist beyond two hours, a new Convective SIGMET is issued to cover the additional time, or the activity may be canceled earlier if it ends. The other durations don’t match the standard convective hazard forecast period, which is kept at two hours to balance timely alerts with the rapidly changing nature of convective weather.

Convective SIGMETs are valid for two hours from the time of issue. This two-hour window reflects the forecast horizon for convective hazards, since thunderstorms can develop or dissipate quickly. If the weather is expected to persist beyond two hours, a new Convective SIGMET is issued to cover the additional time, or the activity may be canceled earlier if it ends. The other durations don’t match the standard convective hazard forecast period, which is kept at two hours to balance timely alerts with the rapidly changing nature of convective weather.