Air carrier First Officer reported continuing the takeoff even after receiving a predictive wind shear warning because the calm ambient conditions seemed to preclude the possibility of wind shear.

Narrative

This event occurred during Takeoff roll on Runway 27R in ATL. Captain and First Officer received a predictive wind shear warning between 80-100 kts; during calm wind conditions. Other weather conditions/reports did not constitute a wind shear event ie: convective activity; strong winds or microbursts. The ATIS was reporting calm winds and no other aircraft that were taking off or landing reported any type of wind shear activity. We believed this to be an erroneous alert because the message lasted approximately 3 seconds and then extinguished. We continued the takeoff and experienced no wind shear during climb out. We believed the message to be erroneous because the weather conditions were not conducive for wind-shear activity. There could've been a glitch in the system. Also being very new to the aircraft and it's systems could've played a part. During training were only trained on wind shear events during poor weather conditions. We have a flow chart that we use to determine if wind shear conditions exist. There were no conditions that even led us to the chart nor any weather reports or ATC/Pilot reports of any kind of possible wind-shear. The AOM (Aircraft Operating Manual) states we must reject the takeoff for any predictive wind shear message prior to V1. However; due to the fluid nature of the situation we deemed it safer to continue the take-off. Perhaps understanding our own human factors and incorporating guidance found in the AOM in a more timely manner; this could've been prevented.