Narrative:

The wind was shifting; I was cutting the ATIS and local control had noticed it was changing even more. I stopped cutting the ATIS so we could discuss the runway change. We had decided to change since aircraft X just went around due to the wind. Local control still had one more inbound and I did not hear local control give aircraft X any instructions as I was working on the ATIS and runway change. As I get done cutting the ATIS aircraft Y was landing roll and aircraft X was 1/4 mile away and descending to the runway. Aircraft X landed opposite direction about 20 seconds in before aircraft X. I held my comments about what happened to myself at that time so I could finish the weather input. I found out local control was telling me that he did not issue a landing clearance and instructed the pilot to go around. Not 5 minutes later we had a vehicle get onto the runway so that increased my workload and I called for relief. This became my focus now. I started completing the paperwork for the vehicle deviation and once dealing with the checklists noticed that odo (opposite direction operations) could be considered a significant event. I again reached out to a supervisor for guidance.hindsight is always 20/20. We don't see runway changes often; I should have waited on the ATIS and watched local control with the movement of traffic (local control is under 1 year certified).

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Original NASA ASRS Text

Title: TOA Tower Controller and GA pilot reported an aircraft possibly landed with an opposite direction traffic rolling on the runway.

Narrative: The wind was shifting; I was cutting the ATIS and local control had noticed it was changing even more. I stopped cutting the ATIS so we could discuss the runway change. We had decided to change since Aircraft X just went around due to the wind. Local control still had one more inbound and I did not hear local control give Aircraft X any instructions as I was working on the ATIS and runway change. As I get done cutting the ATIS Aircraft Y was landing roll and Aircraft X was 1/4 mile away and descending to the runway. Aircraft X landed opposite direction about 20 seconds in before Aircraft X. I held my comments about what happened to myself at that time so I could finish the weather input. I found out local control was telling me that he did not issue a landing clearance and instructed the pilot to go around. Not 5 minutes later we had a vehicle get onto the runway so that increased my workload and I called for relief. This became my focus now. I started completing the paperwork for the vehicle deviation and once dealing with the checklists noticed that ODO (opposite direction operations) could be considered a significant event. I again reached out to a supervisor for guidance.Hindsight is always 20/20. We don't see runway changes often; I should have waited on the ATIS and watched local control with the movement of traffic (local control is under 1 year certified).

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.