What type of weather system can produce hazardous precipitation affecting aircraft operations?

The selection of thunderstorms as the correct answer highlights the significant impact these weather systems can have on aircraft operations. Thunderstorms are known for their intense and rapidly changing atmospheric conditions, which can lead to a variety of hazardous precipitation types, such as heavy rain, hail, and icing.

These factors are especially critical during takeoff and landing phases of flight, where visibility can be severely reduced, and aircraft performance may be adversely affected. Furthermore, thunderstorms can also generate dangerous phenomena like wind shear and turbulence, which pose additional risks to aircraft stability and safety.

While cold fronts and warm fronts can also lead to precipitation, they typically produce more widespread but less severe weather compared to the localized and violent nature of thunderstorms. A high pressure system usually brings calm weather, so it does not present the same hazards as thunderstorms do. Thus, thunderstorms stand out as the most hazardous weather system for aviation operations.