Final answer:
Increasing Performance windshear is a sudden change in wind conditions that increases aircraft lift during takeoff or landing. The annunciations are the alerts provided by onboard systems to warn pilots, which can be auditory or visual.
Step-by-step explanation:
Increasing Performance windshear is a specific type of windshear that a pilot may encounter during takeoff or landing. It refers to a sudden change in wind speed and/or direction that results in an increase in performance and lift of the aircraft. Typically, this means that an aircraft experiences a headwind that increases during takeoff or a tailwind that diminishes during landing, which could temporarily increase lift.
The annunciations of windshear refer to the visual or auditory alerts provided by the aircraft's onboard systems. These come in various forms, such as aural warnings from the cockpit voice warning system that might say "Windshear" or visual cues on the flight deck instruments. The annunciations are integral to windshear detection systems, and they allow pilots to take immediate action to maintain aircraft control.