The Vaisala AviMet® Low-Level Windshear Alert System is a ground-based system that detects low-level windshear in runway corridors. The system gives visual and audio alerts to air traffic controllers and other airport personnel in clear and concise numerical and/or graphical form. At airports that are known to experience low-level horizontal windshear, the AviMet LLWAS can be fundamental to improving safety and operating efficiency.

The AviMet LLWAS processes the wind data using the Phase-3 windshear algorithm. The algorithm was developed for the U.S. Federal Aviation Administration (FAA) by the National Center for Atmospheric Research (NCAR) and patented by the University Corporation for Atmospheric Research Foundation (UCAR). Vaisala is an accredited licensee of the Phase-3 windshear algorithm and can demonstrate compliance with Phase-3 performance.

The Vaisala AviMet Low-Level Windshear Alert System is part of the Vaisala AviMet total aviation weather management solution that bridges the gap between weather and aviation operations. Vaisala AviMet comprises of the technology platform, services, and a growing set of end-user applications ranging from ATC to de-icing applications.