What does the low-level wind shear Alert System (LLWAS) primarily detect?

The primary function of the low-level wind shear Alert System (LLWAS) is to detect changes in wind direction and/or speed within a very short distance above the airport. This detection is crucial for ensuring the safety of takeoffs and landings, as low-level wind shear can significantly impact aircraft performance. Wind shear refers to variations in wind speed and direction that can occur at various altitudes, but LLWAS specifically focuses on the low-level atmospheric environment, typically below 2,000 feet, where such sudden changes can be most hazardous.

This system utilizes a network of sensors positioned around airports to monitor wind conditions and provide real-time data. If there is a significant wind shift or increase in speed detected over short distances, the LLWAS alerts air traffic control and pilots, helping them to prepare for or avoid potential hazards during critical phases of flight.

Other options involve concepts related to aviation weather conditions, but they either pertain to different phenomena or altitudes that LLWAS is not designed to specifically monitor or alert on. For instance, detecting rotating columns of air, wind shifts at higher elevations, or simply continuous winds with a uniform direction do not align with the core purpose of the LLWAS system, which is focused on immediate and localized