Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 21
Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach
Environment - Non Weather Related; Procedure
There was a pair of arrivals staggered by about 0.5-0.75 miles; with the Runway 28 Right arrival preceding Runway 28 Left arrival.  There was a solid 16-32 knots crosswind from the north depending on what altitude they were at.  Runway 28 Left glide slope is 2.85 degrees while Runway 28 Right is 3.00 degrees.  In this very rare set of circumstances; the left arrival is getting a rough ride form the right arrival. Aircraft X  [the first E175] was cleared to land Runway 28 Right and Aircraft Y [the second E175] was cleared to land Runway 28 Left. Aircraft Y was about 2.3 mile final when they advised going around.  I gave them runway heading and 3;000.  I advised them of traffic that departed north and stopped climbing in their southbound turn; an A320; and got visual separation transferred to the pilot.  I then coordinated the go around and was asked the reason.  I said I assumed unstable approach but was not sure.  The aircraft was coming up on level flight and so I confirmed the reason.  The pilot said they were hit by wake turbulence.  I shipped them to Departure; then coordinated with their coordinator the reason.  We logged it in the Tower log; but did not write an MOR (mandatory occurrence report). When the airplane came back around and landed; I inquired about the event.  They said that the airplane yawed to the right and then began rolling to the left so they went around.  That sounds very unsettling to me; however they made it out to fly another approach. No recommendations; it sounds like the pilots did what they were trained to do to save the ship.
SFO Local Controller reported an E175 pilot executed a go-around from short final after encountering wake turbulence from another E175 on final approach to the parallel runway.