Flight Crew Air Transport Pilot (ATP)
Confusion; Situational Awareness; Time Pressure
Ground Event / Encounter Other / Unknown
Flight Crew Rejected Takeoff
Environment - Non Weather Related; Weather
Takeoff was delayed due to a weather cell approaching the airport. There was light rain. One aircraft had just executed a go-around due to glideslope issues. We waited until several aircraft had landed with no reports of windshear and an Airbus in front of us finally took off after a several minute delay. We were comfortable that this many aircraft had taken off with no issue and noted that the cell looked very small and there was only a light wind. During takeoff roll at around 60 KTS Tower announced a windshear alert. It was for Runway 11 but before I recognized that it was the other runway I elected to abort since we were still in the low speed regime. We taxied clear of the runway; ran the QRC and appropriate checklists; and taxied back for a second departure. Several aircraft departed without event while we were waiting after our first aborted takeoff. On the second takeoff; Tower once again announced a windshear alert. However this time we were in the high speed regime in a heavy airplane and I did not see any signs of windshear on the airspeed indicator. We elected to continue the takeoff and it was uneventful.In hindsight we could have delayed the second takeoff attempt; however many aircraft had departed in the time between our first abort and our takeoff. There was no way we could have predicted two windshear alerts from the Tower; one on each takeoff attempt. In the future I might be even more cautious departing when there are small buildups in the airport area; even though this would mean I would be the only aircraft delaying departure while dozens of aircraft depart successfully.
An EMB-145 flight crew rejected their first takeoff attempt when the Tower announced a windshear alert warning. After a delay and several subsequent departures by other aircraft they were once again cleared for takeoff and; once again; the Tower announced a windshear alert. This time they were already in the high speed regime and continued the takeoff which was uneventful.