What does "TS" indicate in a METAR report?

In a METAR report, "TS" stands for Thunderstorm. This abbreviation is used in aviation meteorology to indicate the presence of thunderstorms affecting the reporting station. Thunderstorms can have significant implications for flying conditions, as they may produce hazardous weather phenomena such as turbulence, lightning, heavy precipitation, and even hail.

The identification of thunderstorms is critical for pilots, air traffic controllers, and meteorologists, as it assists in ensuring safety during flight operations. Therefore, the presence of "TS" in a METAR report signals the need for caution, making it an essential piece of information in interpreting the weather conditions at the airport or aerodrome.

Other choices do not accurately reflect what "TS" denotes in the context of METAR reports.