What does the code "SQ" signify?

The code "SQ" signifies squalls, which are sudden, powerful bursts of wind that can be accompanied by precipitation and changes in weather conditions. This term is particularly relevant in aviation and meteorological contexts, as squalls can significantly affect flight operations and safety due to their unpredictable nature and the intense weather they can bring.

Understanding this code is crucial for air traffic controllers as it allows them to communicate effectively about atmospheric conditions that may impact aircraft, helping to ensure the safety and efficiency of air traffic operations. The other codes refer to different types of weather phenomena but do not specifically align with the definition of "SQ."