Originally Posted by vilas
PWS need not necessarily lead to reject take off because you are not yet in WS but reversal or wild fluctuations of trend arrow is sure sign you are in it.
Do you understand that PWS is part of the Weather Radar System and is looking at windshear 0.5 to 3nm ahead of the aircraft?
Airspeed indications may be completely normal during the takeoff run. If you get a warning at 100kts with no airspeed fluctuations, do you really want to continue if windshear is 0.5nm ahead? You may be barely off the ground before you hit the windshear.