CWAs are issued for existing or anticipated adverse weather conditions within what period of time?

The correct duration for which Convective Weather Advisories (CWAs) are issued is two hours. CWAs are designed to provide timely information regarding severe weather phenomena, such as thunderstorms that could impact aviation operations. These advisories focus on existing or anticipated adverse weather conditions that could affect flight safety and efficiency.

The two-hour timeframe is critical because it allows pilots, air traffic controllers, and dispatchers to make informed decisions based on the likelihood of hazardous weather developing or continuing in that period. This timeframe is particularly effective for monitoring short-term weather patterns that can change rapidly, which is common with convective weather.

Other options extend beyond this critical brief window, which does not align with the immediate nature of CWAs aimed at addressing current or near-term weather threats.