PGA, all depends on severity and actual conditions determined by the pilot along with the warning when it comes to predictive WS.
The “W/S AHEAD” message is displayed on each PFD. The color of the message depends on the severity and location of the windshear.
Note: When a predictive windshear alert (′′WINDSHEAR AHEAD′′ or ′′GO AROUND WINDSHEAR AHEAD′′) is triggered, if the flight crew makes a positive verification that no hazard exists, then the alert may be disregarded, as long as : ‐ There are no other signs of possible windshear conditions, and ‐ The reactive windshear system is operational. Known cases of spurious predictive windshear alerts have been reported at some airports, during either takeoff or landing, due to the specific obstacle environment. However, always rely on any reactive windshear (′′WINDSHEAR′′).
Funny enough in the next check list Airbus cautioned about aborting takeoff with reactive W/S warning.
If windshear is detected, either by the system or by pilot observation, apply the following recovery technique :
If before V1 :
The takeoff should only be rejected if significant airspeed variations occur below indicated V1, and the pilot decides that there is sufficient runway remaining to stop the airplane.
In other words if you're RWY limited and and W/S occurs somewhere above 100 kts close to V1 aborting takeoff is like playing the Russian roulette.
