What type of winds must LLWAS detect and predict?

The correct response focuses on low level wind shear (LLWS), which refers to a rapid change in wind speed and/or direction that occurs within a relatively small vertical or horizontal distance, particularly near the ground. LLWAS, or Low Level Winds Alert System, is designed specifically to detect and predict these types of wind conditions at airports to enhance safety for takeoffs and landings.

Low level wind shear can create hazardous conditions for aircraft, particularly during the critical phases of flight when they are close to the ground. This system provides real-time information to pilots and air traffic controllers, allowing them to make informed decisions and take necessary precautions in response to changing wind conditions.

The other options do not correctly align with the purpose of LLWAS. While crosswinds can be a concern for pilots, LLWAS is not limited to detecting only crosswinds, nor does it account for high altitude winds, which are outside the scope of its monitoring capabilities. Additionally, ground level winds, although related, do not encompass the critical aspect of vertical or rapid directional changes that characterize wind shear situations. Thus, low level wind shear is the focus of LLWAS detection and prediction.