Date: 201502
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Cloudy
Light: Night
Aircraft: B737 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Landing
Airspace: Class C ZZZ
ATC / advisory: Tower ZZZ
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness; Distraction; Communication Breakdown; Confusion
Second reporter function: First Officer; Pilot Flying
Anomaly: ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Landing Without Clearance; Ground Incursion Runway
Detector: Person Flight Crew
When detected: In-flight
Contributing factors: Weather; Human Factors
Primary problem: Human Factors

Narrative: We were flying Flight X to ZZZ. I was the Pilot Monitoring. The First Officer (FO) briefed a Visual Approach to 10R backed up with the ILS. While descending on the ZZZ RNAV Arrival we visually picked up the airport at approximately 10 miles.  Shortly thereafter Approach asked us if we had the airport in sight; and then cleared us for the visual approach to 10L and switched us to Tower frequency.  The FO was initially heading too far to the east; but then corrected back towards a five mile final/base.  As the FO turned base; there was a small cloud bank between us and the airport that we had not previously observed.  The FO maneuvered around the clouds and then lined up on the runway on speed; and on glide path.  The 10R lighting was very bright and visually over powered the 10L lighting; making 10L very hard to see.  After landing and clearing the runway I realized that we had landed on 10R instead of 10L.  We called the Tower and they had no problem with the mistake and said 'not to worry'!


Second narrative: We were flying Flight X to ZZZ. I was the Pilot Flying. My expectation was that we were going to land to the west. When we received the ATIS; however; they were advertising 10 L/R. We briefed a visual to 10R; backed up by the Localizer. We were descending on the ZZZ RNAV Arrival when Approach Control affirmed that we had the airport in sight and cleared us for the Visual to 10L. We entered 10L into the FMS with a five mile fix off the approach end. I still had it in my head that we were landing west; so instead of turning base; I disengaged the autopilot and started to fly a downwind leg. I quickly realized my mistake and informed the Captain. He set my navigation to proceed direct to the five mile fix off 10L and I turned the aircraft to proceed to that fix. I focused my attention on the instruments; making sure I was at the correct speed and descent rate while navigating to the fix. When I looked back outside; the airport was obscured by a scattered cloud layer. We navigated around it; and saw the runway which had its approach lighting system on bright. I checked my instrumentation; which showed no lateral or vertical deviations. We were stabilized; on VASI; and proceeded with an uneventful landing. We were cleared off the runway by Tower and then cleared by Ground Control to the gate. It was only after we had parked that I realized that we had landed on 10R. I wasn't sure if our clearance had changed at some point during the approach; so I made a quick phone call to Tower to inquire about it and was told by the Tower Controller 'not to worry about it'.


Synopsis: A B737 air crew landed on Runway 10R after being cleared to Runway 10L. The approach was initially obscured by scattered clouds and when they broke out the lighting on 10R was very bright and visually overpowered the 10L lighting.