Within 1952 Radar Flap
How Andrews AFB Documented the 1952 Washington UFOs
This page explores how Andrews AFB radar operators tracked multiple unexplained objects over Washington in July 1952.
On this page
- Radar detection procedures and equipment
- Timeline of July 19–20 and 26–27 sightings
- Visual observations and coordination with civilian radar
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Introduction
In July 1952, Andrews Air Force Base in Maryland became one of the most important military locations in the investigation of the Washington radar sightings. While the broader incident is often remembered as a UFO flap over the American capital, Andrews’ role was more specific and more significant: its radar operators, controllers and tower personnel provided one of the key independent checks on what Washington National Airport was seeing on its own screens. Because the sightings involved both military and civilian radar systems, Andrews helped transform what might otherwise have been dismissed as a local radar malfunction into a national security concern. [Wikipedia]Wikipedia1952 Washington, D.C. UFO incident1952 Washington, D.C. UFO incident
The Andrews data remain central to debates about the case. Supporters of the unexplained interpretation argue that multiple radar systems tracked the same targets simultaneously, while sceptics point to atmospheric conditions, radar limitations and misidentified visual observations. More than seventy years later, the Andrews records still sit at the heart of the question: were controllers tracking genuine airborne objects, or were they witnessing a combination of radar anomalies and ordinary lights distorted by unusual weather conditions? [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
How Andrews Radar Entered the Investigation
The first major weekend of sightings began late on 19 July 1952 when controllers at Washington National Airport detected unusual radar returns moving through restricted airspace around the capital. Senior controller Harry Barnes and his colleagues quickly ruled out obvious causes such as known aircraft movements and equipment failure checks on their own system. When the radar contacts appeared near sensitive areas of Washington, National Airport contacted Andrews Air Force Base for confirmation. [Wikipedia]Wikipedia1952 Washington, D.C. UFO incident1952 Washington, D.C. UFO incident
Initially Andrews operators did not report matching targets. Shortly afterwards, however, reports began emerging from personnel at the base itself. Radar operators detected unusual returns, while observers in the control tower reported strange lights in the sky. This shift was important because it meant that the incident was no longer confined to a single radar installation. The possibility that two separate facilities were observing related phenomena immediately increased military interest. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
For investigators, Andrews offered a crucial comparison point. The base operated within the same regional air-defence environment as Washington National Airport but used separate personnel and equipment. Any overlap between the two systems therefore carried greater evidential weight than a single radar report would have done. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
Radar Procedures and Equipment in 1952
Understanding the Andrews data requires some appreciation of how radar worked in the early 1950s. Air-traffic and military radar systems of the period lacked many of the digital filtering tools that later became standard. Operators viewed returns on cathode-ray tube displays and relied heavily on training and experience to distinguish aircraft from weather effects, ground reflections and other forms of clutter. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
This human element cuts both ways in later interpretations of the case.
On one hand, UFO researchers have long argued that experienced controllers knew the difference between ordinary interference and genuine moving targets. Several participants later maintained that the radar returns behaved unlike routine false echoes. Air Force officer Edward Ruppelt, who later headed Project Blue Book, wrote that many radar specialists involved did not believe inversion effects adequately explained everything observed that night. [Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Twelve…There was talk of temperature inversions and the…
On the other hand, sceptics note that 1950s radar technology was far more vulnerable to anomalous propagation effects than modern systems. Temperature inversions could bend radar beams and create misleading returns that appeared to move or hover. Critics such as aviation journalist Philip Klass later argued that controllers may have been interpreting atmospheric artefacts as solid targets. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
The Andrews records therefore became a test case not only for UFO claims but also for the reliability of early radar interpretation under unusual atmospheric conditions.
The Night of 19–20 July
The most frequently cited Andrews observations occurred during the first weekend of the sightings.
As reports multiplied around Washington, personnel at Andrews began seeing both radar contacts and unusual lights. Airman William Brady reported an orange object with a trailing appearance that accelerated away at remarkable speed. Staff Sergeant Charles Davenport described an orange-red light that appeared stationary before changing direction and altitude abruptly. These observations were visual rather than purely radar-based, but they occurred during the same period that controllers were discussing unidentified returns. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
One of the strongest pieces of evidence cited by proponents of the unexplained interpretation involved simultaneous tracking. According to accounts from the incident, both radar facilities at Washington National Airport and radar at Andrews reportedly tracked an object hovering near a radio beacon. The target then disappeared from all displays at essentially the same time. To believers, this suggested a real object rather than a random equipment malfunction. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
Another factor that attracted attention was the apparent relationship between radar contacts and interceptor aircraft. Radar targets often faded or disappeared when Air Force jets approached and sometimes reappeared after the aircraft departed. Controllers found the pattern striking, although later investigators pointed out that changing radar conditions could also produce intermittent returns. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
The Second Weekend: 26–27 July
A week later, similar reports returned. Once again radar operators around Washington detected unidentified targets, and military authorities responded by scrambling interceptor aircraft. Andrews remained part of the regional tracking network used to monitor the situation. [sgp.fas.org]sgp.fas.orgCIA's Role in the Study of UFOs, 1947-90On 19 and 20 July, radar scopes at Washington National Airport and Andrews Air Force Base tracked…
Project Blue Book documentation relating to the second weekend noted that the most reliable evidence consisted of radar targets rather than visual sightings. This distinction became increasingly important. Investigators found that eyewitness accounts varied considerably, whereas radar contacts appeared to provide a more structured record of events. Even so, the interpretation of those contacts remained disputed. [cufon.org]cufon.orgbb 1661Project Blue Book Case 1661 - CUFONUnidentified objects were sighted between 2000E and 2300E on 26 July 1952. The sightings were visual a…
The repetition of unusual radar reports on two separate weekends strengthened public interest. If atmospheric conditions were responsible, they had apparently produced remarkably similar results on separate occasions. If the targets represented genuine objects, then they had returned to some of the most sensitive airspace in the United States. Either possibility made the Andrews data difficult to dismiss casually. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
Visual Observations and Their Limits
Although the radar evidence receives most attention, Andrews personnel also made visual reports. These accounts are often presented alongside the radar returns as corroborating evidence. Yet they were not always as strong as later retellings suggest.
Captain Harold May, who was present in the Andrews radar centre, became one of the most cited examples. After hearing reports of an unidentified object, he went outside and observed a light that seemed to change colours and altitude. Initially the sighting appeared to support the radar operators’ concerns. However, May later concluded that he had likely been observing a star distorted by atmospheric conditions. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
This reversal is important because it illustrates a recurring pattern in the Washington case. Several observations that appeared dramatic in real time became less convincing when reviewed later. Human perception, particularly at night and during periods of excitement, proved vulnerable to misinterpretation. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
At the same time, not every observer accepted conventional explanations. Some Andrews personnel remained convinced that what they witnessed could not be reduced entirely to stars, meteors or ordinary aircraft. The disagreement among witnesses is one reason the incident remains controversial rather than fully resolved. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
Why the Andrews Confirmation Still Matters
The strongest argument for the significance of Andrews Air Force Base is not any single visual sighting. It is the existence of multiple reporting channels operating within the same event window.
[The Washington sightings involved:]wral.coma radar blip a flash of light how ufos exploded into public viewA Radar Blip, a Flash of Light: How UFOs 'Exploded' Into…Aug 3, 2018 — One theory promoted by the Air Force was that a layer of hot ai…
- Civilian radar at Washington National Airport. [sgp.fas.org]sgp.fas.orgCIA's Role in the Study of UFOs, 1947-90On 19 and 20 July, radar scopes at Washington National Airport and Andrews Air Force Base tracked… * Military radar at Andrews Air Force Base. [sgp.fas.org]sgp.fas.orgCIA's Role in the Study of UFOs, 1947-90On 19 and 20 July, radar scopes at Washington National Airport and Andrews Air Force Base tracked…
- Air traffic controllers and military personnel.
- Commercial and military pilots.
- Ground-based visual observers. [WRAL News]wral.coma radar blip a flash of light how ufos exploded into public viewA Radar Blip, a Flash of Light: How UFOs 'Exploded' Into…Aug 3, 2018 — One theory promoted by the Air Force was that a layer of hot ai…
This overlap created the impression of a multi-sensor event decades before the phrase became common in discussions of unidentified aerial phenomena. Even critics generally acknowledge that the case was more complex than a single mistaken observation. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
For Maryland’s UFO history, Andrews occupies a distinctive place because it supplied the military confirmation that elevated the incident from a local curiosity to a national defence issue. Without Andrews, the Washington radar sightings might have remained a story about one airport’s radar anomalies. With Andrews involved, the episode triggered Air Force investigations, national headlines and one of the largest Pentagon press conferences since the Second World War. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
The Continuing Debate Over the Radar Data
The central dispute has changed little since 1952.
Those who regard the case as genuinely unexplained point to simultaneous radar detections, experienced operators, repeated sightings over two weekends and the difficulty of fitting every report into a single conventional explanation. The Andrews radar confirmations remain one of their strongest pieces of evidence. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
Sceptics focus on the meteorological conditions. Air Force investigators, Civil Aeronautics Administration analysts and later commentators concluded that temperature inversions and related propagation effects could create false radar targets. They argue that once atmospheric distortion, stars, meteors and ordinary aircraft are taken into account, the Andrews observations become far less mysterious. [Wikipedia]WikipediaProject Blue BookProject Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical…
What makes the Andrews case historically important is that neither side fully eliminated the other argument. The radar data were substantial enough to spark serious investigation, yet incomplete enough to prevent a definitive conclusion. That unresolved status explains why Andrews Air Force Base remains one of the most frequently discussed Maryland locations in the history of the 1952 Washington sightings. [2sgp.fas.org]sgp.fas.orgCIA's Role in the Study of UFOs, 1947-90On 19 and 20 July, radar scopes at Washington National Airport and Andrews Air Force Base tracked…
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Endnotes
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Source: Wikipedia
Title: 1952 Washington, D.C. UFO incident
Link: https://en.wikipedia.org/wiki/1952_Washington%2C_D.C._UFO_incident -
Source: sgp.fas.org
Link: https://sgp.fas.org/library/ciaufo.htmlSource snippet
CIA's Role in the Study of UFOs, 1947-90On 19 and 20 July, radar scopes at Washington National Airport and Andrews Air Force Base tracked...
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Source: cufon.org
Title: bb 1661
Link: https://www.cufon.org/cufon/wash_nat/bb_1661.htmSource snippet
Project Blue Book Case 1661 - CUFONUnidentified objects were sighted between 2000E and 2300E on 26 July 1952. The sightings were visual a...
Published: July 1952
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Source: wral.com
Title: a radar blip a flash of light how ufos exploded into public view
Link: https://www.wral.com/story/a-radar-blip-a-flash-of-light-how-ufos-exploded-into-public-view/17744754/Source snippet
A Radar Blip, a Flash of Light: How UFOs 'Exploded' Into...Aug 3, 2018 — One theory promoted by the Air Force was that a layer of hot ai...
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Source: Wikipedia
Title: Project Blue Book
Link: https://en.wikipedia.org/wiki/Project_Blue_BookSource snippet
Project Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical...
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Source: wral.com
Title: a radar blip a flash of light how ufos exploded into public view
Link: https://www.wral.com/story/a-radar-blip-a-flash-of-light-how-ufos-exploded-into-public-view/17745227/Source snippet
A Radar Blip, a Flash of Light: How UFOs 'Exploded' Into...3 Aug 2018 — “I don't think [temperature inversion]({{ 'temperature-inversion/' | relative_url }}) had much to do with it, but...
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Source: history.com
Title: Read more
Link: https://www.history.com/articles/u-s-air-force-closes-the-book-on-ufos-45-years-agoSource snippet
How the US Air Force Investigated UFOs During the Cold...17 Dec 2014 — Perhaps the most extraordinary of all came in July 1952, when a s...
Published: July 1952
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Source: sacred-texts.com
Link: https://sacred-texts.com/ufo/rufo/rufo14.htm -
Source: sacred-texts.com
Link: https://sacred-texts.com/ufo/rufo/rufo13.htmSource snippet
Internet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Eleven...In early June 1952, Project Blue Book was operati...
Published: June 1952
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Source: cia.gov
Title: cia rdp81r00560r000100010001 0
Link: https://www.cia.gov/readingroom/document/cia-rdp81r00560r000100010001-0Source snippet
THE NATIONAL INVESTIGATIONS COMMITTEE ON...The celebrated Washington radar sightings of July 1952 occurred during a period when typical...
Published: July 1952
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Source: archives.gov
Title: Project BLUE BOOK
Link: https://www.archives.gov/research/military/air-force/ufosSource snippet
Unidentified Flying Objects25 Jun 2024 — Pro-UFO researchers claim that an extraterrestrial spacecraft and its alien occupants were recov...
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Source: britannica.com
Link: https://www.britannica.com/topic/Project-Blue-BookSource snippet
Project Blue Book | Definition, History, Aliens, UFOs, & FactsIn the hot summer of 1952 a provocative series of radar and visual sighting...
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Source: washingtonian.com
Title: dc had multiple ufo sightings 71 years ago
Link: https://washingtonian.com/2023/02/13/dc-had-multiple-ufo-sightings-71-years-ago/Source snippet
Airport reported seven unexplained radar blips, including over the White House and Capitol. Other controllers—at National and Andrews Air...
Additional References
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Source: medium.com
Title: ufos and radar targets clutter safety and false certainty c3eab7a878ad
Link: https://medium.com/%40timventura/ufos-and-radar-targets-clutter-safety-and-false-certainty-c3eab7a878adSource snippet
UFOs and Radar: Targets, Clutter, Safety, and False CertaintyFrom Washington 1952 to the Nimitz encounter, this story explores UFOs, rada...
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Source: visiontimes.com
Title: the 1952 washington d c ufo incidents that shocked the white house
Link: https://www.visiontimes.com/2026/02/10/the-1952-washington-d-c-ufo-incidents-that-shocked-the-white-house.htmlSource snippet
UFO Incidents That Shocked...Feb 10, 2026 — Strikingly, when the jets entered the area, the radar targets temporarily vanished; once the...
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Source: dcist.com
Title: in the early 1950s d c was obsessed with ufos heres why
Link: https://dcist.com/story/19/12/09/in-the-early-1950s-d-c-was-obsessed-with-ufos-heres-why/Source snippet
Was Obsessed With UFOs. Here's...Dec 9, 2019 — The incidents over D.C. was one of a number of UFO sightings across the country that the...
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Source: enigmalabs.io
Title: Washington D.C. Incident At 11:40 p.m. on Saturday,
Link: https://enigmalabs.io/library/ca7fafd2-c59e-4b29-a1ec-5dbb92d02fd8Source snippet
Washington D.C. IncidentAt 11:40 p.m. on Saturday, July 19, 1952, an air traffic controller at Washington National Airport spotted seven...
Published: July 19, 1952
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Source: prologue.blogs.archives.gov
Title: Saucers over Washington,
Link: https://prologue.blogs.archives.gov/2019/12/19/saucers-over-washington-the-history-of-project-blue-book/Source snippet
Pieces of HistorySaucers Over Washington: the History of Project Blue Book19 Dec 2019 — The primary purpose of Project Blue Book was to k...
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Source: eurasiantimes.com
Title: America’s “Most Dramatic” UFO Encounter!
Link: https://www.eurasiantimes.com/white-house-under-siege-ufos-swarmed-the-white-house/Source snippet
73 Years After...11 Jan 2026 —... 1952. On July 19-20, radar operators at Washington National Airport, Andrews Air Force Base, and othe...
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Source: reddit.com
Link: https://www.reddit.com/r/UFOB/comments/1hd9ztr/the_1952_washington_dc_ufo_incident_and/Source snippet
RedditThe 1952 Washington D.C. UFO Incident and similarities to...- At one point both radar centers at National Airport and the radar at...
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Source: files.ncas.org
Link: https://files.ncas.org/condon/text/s3chap05.htmSource snippet
Report, Sec III, Chapter 5: Optical & Radar AnalysisWeather: clear with visibility unlimited; temperature inversion layer with sharp humi...
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Source: facebook.com
Title: On This Day in Arlington history,
Link: https://www.facebook.com/ArlingtonHistoricalSociety/posts/on-this-day-in-arlington-history-july-19-1952-harry-s-barnes-the-senior-air-rout/1053390619708592/Source snippet
July 19, 1952...The unknown radar targets could be explained by temperature inversion, which was present in the air over Washington DC...
Published: July 19, 1952
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Source: upload.wikimedia.org
Title: Project Blue Book, BBA PBSR9 300
Link: https://upload.wikimedia.org/wikipedia/commons/c/cd/Project_Blue_Book%2C_BBA-PBSR9-300.pdfSource snippet
Project Blue Book ArchiveAt 0030 EST on 30 November 1952, the CAA radar at Washington National. Airport again began to show "blips" simil...
Published: November 1952
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