Widebody Transport
Air Traffic Control Fully Certified
Situational Awareness; Time Pressure
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach
Procedure; Airspace Structure; Human Factors
Aircraft Z was on a visual approach to Runway 27; Aircraft Y was ready to depart Runway 36L; Aircraft X was on a visual approach to Runway 36L. Aircraft Z was asked to keep his speed up as much as possible. Aircraft X was told to continue and reduce to final approach speed. Aircraft Y was instructed to line up and wait and told about the traffic and when he could expect to depart. Aircraft X was also informed when to expect landing clearance. Once Aircraft Z crossed the Runway 27 threshold and touched down Aircraft Y was cleared for takeoff. Aircraft Y was airborne about midfield when I observed Aircraft X initiate a go-around. Aircraft X immediately started a left hand turn; but never verbally communicated a pilot initiated go-around. I instructed Aircraft Y to fly runway heading and climb and maintain 5;000 feet so as not to conflict with Aircraft X in the left turn. I then instructed Aircraft X to turn left heading 270 and climb and maintain 3;000 feet.If I had not waited for Aircraft Z to touch down and used the Arrival Departure Window (ADW) procedure more effectively Aircraft Y would have been further down the runway thus possibly negating the need for Aircraft X to initiate a go-around. Also; I could have just waited to depart Aircraft Y.
MEM Tower Local Controller reported they had to issue last minute instructions to separate an arriving aircraft which initiated a go-around just as a departure was airborne.