In TAF reports, what does the code 9999 denote?

The code 9999 in TAF reports indicates visibility greater than 10 kilometers. This code is used to represent excellent visibility conditions under which pilots can expect clear visibility as part of the weather information being relayed.

In TAF (Terminal Aerodrome Forecast) reports, visibility is critical for flight planning and operations since it directly affects a pilot's ability to navigate and land safely. When the value is listed as 9999, it signifies that the visibility is extensive and exceeds the 10-kilometer threshold, which is typically well beyond what would be encountered in low-visibility situations. This information allows pilots to assess the environment in which they will operate, ensuring that safe flight paths can be maintained.