Final answer:
The weather requirements at an airport to dispatch an aircraft include minimum visibility and cloud base criteria. Thunderstorms and heavy precipitation can also impact the decision to dispatch an aircraft.
Step-by-step explanation:
The weather requirements for dispatching an aircraft from an airport depend on several factors. One of the most important weather elements to consider is visibility. For example, to dispatch an aircraft, the visibility at the destination airport should be above a certain minimum value, typically around 3 miles or 5 kilometers. This is to ensure that pilots can see other aircraft and the runway clearly during landing.
Another crucial aspect is the cloud ceiling or cloud base. The cloud ceiling is the height of the lowest cloud layer above the ground. To dispatch an aircraft, the cloud base should be above a certain minimum value, which varies depending on the type of operation and aircraft. A higher cloud base ensures safe takeoff and landing operations by providing better visibility.
The presence of certain weather phenomena, such as thunderstorms or heavy precipitation, may also impact the decision to dispatch an aircraft. These weather conditions can affect the safety and efficiency of flight operations, so they need to be carefully considered.