What weather phenomenon is indicated by the code "TS" in aviation observations?

The code "TS" in aviation observations signifies a thunderstorm. In meteorological reporting, this notation is used globally to alert aviators to the presence of thunderstorm activity, which can be hazardous to flight operations. Thunderstorms can produce various dangerous phenomena, including turbulence, lightning, hail, and significant precipitation, all of which can impact both takeoff and landing procedures, as well as in-flight safety.

Understanding the specific implication of "TS" is critical for pilots and aviation personnel because it dictates their operational decisions, such as altering flight paths or preparing for potential delays. The intensity and unpredictability of thunderstorms make them one of the foremost weather concerns in aviation.