What occurred at 2300Z in the provided TAF for KMKC?

The correct answer pertains to the specific weather information provided in the Terminal Aerodrome Forecast (TAF) for KMKC at the time of 2300Z. In TAF reports, the ceiling refers to the height of the lowest layer of clouds that cover more than half the sky. When a TAF states a ceiling at 20,000 feet, it means that there is a substantial layer of clouds at that altitude, which would be significant for flight operations.

Having a ceiling at 20,000 feet indicates good weather conditions for aviation, as this altitude is generally well above the minimum for most aircraft operations. High ceilings, like this one, typically reduce restrictions for visual flight rules (VFR) and positively influence overall safety margins for operations.

While other options might suggest different weather phenomena or changes, none provide the same level of clarity regarding the vertical cloud coverage present at the 2300Z forecast. Factors such as broken ceilings or reduced visibility due to fog conditions would denote less favorable conditions for pilots and dispatchers. Thus, identifying the ceiling at 20,000 feet is the most accurate interpretation of the weather forecast at that specific moment in time.