Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Weather / Turbulence
Flight Crew Rejected Takeoff
Weather
Rejected takeoff at 80 knots due to CAWS 'Headwind Shear' Warning.  Winds were reported as 190/27 G 35. Gusty wind conditions resulted in receiving a CAWS 'Headwind Shear' warning at 80 KIAS.
Reported wind was 190/25 gusting 35. First Officer (FO) was pilot flying. On takeoff roll; shortly after the 80 knot call; we were given a windshear alert. Captain called a reject and we transferred controls. We taxied clear and ran through the rejected takeoff checklist. Upon completion of the checklist and after checking that brake temps were satisfactory for another takeoff attempt; Capt directed me to enter a windshear profile into the takeoff data. He also became the pilot flying. We then departed the field with no further incident.
Flight crew reports rejecting a takeoff at 80 knots due to CAWS 'Headwind Shear' Warning. The next takeoff is uneventful.