Within Kinross
What Did the Merged Blips Mean?
The famous merged blips are central to the mystery, but 1950s radar resolution makes them weaker evidence than many retellings imply.
On this page
- What ground radar reportedly showed
- Why two targets could appear as one
- How the merge fed later UFO claims
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Introduction
The most famous detail in the Kinross incident is the reported “merge” of two radar blips shortly before the disappearance of the F-89C Scorpion flown by First Lieutenant Felix Moncla Jr and Second Lieutenant Robert L. Wilson. In many later UFO retellings, this moment became the apparent climax of the case: the interceptor closed on an unidentified target, the two radar returns fused into one, and the jet was supposedly swallowed or destroyed by the unknown object. Yet the actual evidential value of the radar merge is far more limited than popular accounts suggest.
The radar data remains important because it confirms that ground controllers were tracking both the interceptor and another aircraft or radar contact over Lake Superior. However, 1950s ground-controlled interception radar had relatively coarse resolution, intermittent tracking quality, and important operational limitations. A merged return could mean two aircraft were extremely close together on the radar display, but it did not by itself prove collision, contact, or disappearance into another object. Understanding those technical limits is central to understanding why the Kinross incident remains unresolved rather than conclusively mysterious. [openskiesproject.org]openskiesproject.orgThe Kinross IncidentDuring that era, radar resolution was relatively low, causing targets in close proximity to merge on the radar screen… [Wikipedia]WikipediaGround-controlled interceptionGround-controlled interception
What Ground Radar Reportedly Showed
According to later reconstructions based on surviving Air Force material and radar-station history, controllers at Calumet Air Force Station tracked an unidentified or insufficiently identified aircraft over Lake Superior on the evening of 23 November 1953. The target was later officially associated with a Royal Canadian Air Force C-47 transport that was reportedly off course. An F-89C interceptor, callsign Avenger Red, was scrambled from Kinross Air Force Base to identify it. [openskiesproject.org]openskiesproject.orgGround-Controlled InterceptionThis allowed a single radar station to provide a complete 360 degree view of the airspace around the statio… [Wikipedia]WikipediaFelix MonclaThe USAF reported that Moncla had crashed into Lake Superior while tracking a Royal Canadian Air Force (RCAF) C-47 aircraf…
Ground-control operators then guided the interceptor toward the target using Cold War-era ground-controlled interception procedures. Near the end of the intercept sequence, radar operators reportedly observed the two returns converge into a single radar blip. Soon afterwards, the F-89’s Identification Friend or Foe signal disappeared and radio contact was lost. Search operations later failed to recover the aircraft or crew. [2visitkeweenaw.com]visitkeweenaw.comMissing in the Keweenaw | The Kinross Incident20 Nov 2023 — The two aircraft appeared to converge on the control screen at Calumet, then…
This sequence created two very different narratives:
- In the official accident interpretation, the merge represented the interceptor successfully closing with the target before suffering an unrelated accident.
- In later UFO literature, the merge became interpreted as evidence that the unknown object physically absorbed, destroyed, or abducted the interceptor. [HowStuffWorks]science.howstuffworks.comufo government4HowStuffWorksThe 1953 Kinross UFO IncidentRadar operators watched the aircraft close in on the UFO, and then something fantastic happened…
The problem is that the radar evidence itself cannot reliably distinguish between those interpretations.
Why Two Targets Could Appear as One
Radar Resolution in the Early 1950s
The Kinross intercept occurred during an era when military radar was effective for broad tracking but comparatively crude in fine detail. Ground-controlled interception systems were designed primarily to place fighter aircraft near a target, not to produce forensic-quality positional data. Operators viewed sweeping radar displays in which nearby targets could blur together depending on distance, angle, altitude separation, weather interference, and display quality. [Royal Air Force]raf.mod.ukRoyal Air Force80th Anniversary of the First Ground Control Intercept…1 Jan 2021 — Three advances combined to solve the night-time int… Wikipedia The Open Skies Project’s technical discussion of the Kinross case directly addresses this issue [Wikipedia]WikipediaGround-controlled interceptionGround-controlled interception, noting that radar systems of the period had low enough resolution that close targets commonly merged into one display return. The project specifically argues that later UFO writers misunderstood this behaviour and treated a normal radar effect as evidence of physical contact. [openskiesproject.org]openskiesproject.orgOpen Skies ProjectOur goal is to preserve and display the history of this legendary Cold War radar station and its place in the local his…
Modern radar terminology still uses the idea of a “merge” or “merge plot” to describe tracks entering the same radar resolution cell. Contemporary interception doctrine recognises that when two aircraft come within the radar system’s discrimination limits, controllers may temporarily see only one combined return. [IVAO Documentation Library]wiki.ivao.aeroRadar returns/tracks have come together. ICs will refer to fighters in MERGED state when the system's resolution capability is limited or…
In practical terms, this means the Kinross merge could indicate several possibilities:
- The interceptor had approached very closely to the target.
- The radar lacked enough precision to display two nearby returns separately.
- One track temporarily masked or overlapped the other on the display.
- Weather, signal fading, or operator interpretation affected the presentation.
None of those possibilities automatically implies collision.
The Limits of Position Accuracy
Another weakness in later UFO retellings is the assumption that radar displays showed exact physical relationships between aircraft. In reality, 1950s ground radar often produced approximate positional information rather than precise spatial certainty. Operators were working with rotating sweeps, manually interpreted returns, and systems vulnerable to clutter, propagation effects, and intermittent fading. [2marconiradarhistory.pbworks.com]marconiradarhistory.pbworks.comTab RADAR GROUND CONTROL INTERCEPTION…Develop a method whereby information from any two at any time of the following equipments, 12 metre…
Altitude separation was also difficult to judge from many radar displays of the period. Two aircraft at substantially different heights could still appear merged on a plan-position display if their horizontal positions overlapped from the radar’s perspective. A merged blip therefore did not necessarily mean the aircraft occupied the same physical space. [Wikipedia]WikipediaAMES Type 80AMES Type 80
This matters because many dramatic retellings implicitly assume that the radar operators witnessed a literal impact or disappearance event. The surviving descriptions do not support that level of certainty.
What the Merge Did and Did Not Prove
The radar merge remains meaningful evidence, but its evidential strength is narrower than often claimed.
What the merge strongly suggests:
- The F-89 was successfully vectored toward another radar target.
- The interceptor likely came very close to that target.
- Ground controllers were actively tracking the intercept sequence in real time.
- The disappearance occurred during or immediately after the closing phase of the intercept. [2visitkeweenaw.com]visitkeweenaw.comMissing in the Keweenaw | The Kinross Incident20 Nov 2023 — The two aircraft appeared to converge on the control screen at Calumet, then…
What the merge does not prove:
- That the two aircraft collided.
- That the unknown target destroyed the interceptor.
- That the target was extraterrestrial or anomalous.
- That the radar operators saw a single object absorb another object.
- That only one object left the area afterwards.
Some later accounts even claimed that the combined blip continued flying away after the merge, implying that the unknown craft survived while the fighter vanished. Surviving documentation for that claim is weak and inconsistent. The more technically grounded reconstructions instead describe loss of the interceptor’s return and communication rather than a clearly tracked post-merge escape by a UFO. [2mibsar.com]mibsar.comUSAFcrash ReportREPORT OF AIRCRAFT ACCIDENT Use this form in…24 Nov 2025 — The radar return from the other aircraft indicated it was continuing on its…
How the Merge Fed Later UFO Claims
The Influence of UFO Writers
The merged-blip story became central to UFO mythology partly because it condensed the case into a dramatic visual image: two radar targets become one and then vanish. Writers such as Donald Keyhoe helped popularise this interpretation during a period when radar evidence carried enormous cultural authority. Radar was widely viewed by the public as objective and nearly infallible, especially in Cold War air-defence settings. [openskiesproject.org]openskiesproject.orgThe Kinross IncidentDuring that era, radar resolution was relatively low, causing targets in close proximity to merge on the radar screen…
That cultural context mattered. In the 1950s, radar was associated with military precision, secret technology, and national security. To many readers, a radar merge sounded less like an ambiguous technical artefact and more like machine-confirmed proof of something extraordinary.
Yet historians and technically minded researchers later pointed out that the UFO narrative often overstated what the radar operators could actually see. A radar scope was not a cinematic display of aircraft behaviour. It was an interpretive instrument with limited resolution and substantial room for ambiguity. [openskiesproject.org]openskiesproject.orgGround-Controlled InterceptionThis allowed a single radar station to provide a complete 360 degree view of the airspace around the statio… [Wikipedia]WikipediaGround-controlled interceptionGround-controlled interception
Why the Story Persisted
The merge remained compelling because it coincided with several unresolved features of the Kinross incident:
- The interceptor was never conclusively recovered.
- Weather conditions over Lake Superior complicated search operations.
- The official identification of the tracked aircraft as an RCAF C-47 was later questioned.
- Records and recollections from the event were incomplete and sometimes contradictory. [2visitkeweenaw.com]visitkeweenaw.comMissing in the Keweenaw | The Kinross Incident20 Nov 2023 — The two aircraft appeared to converge on the control screen at Calumet, then…
Without wreckage or a definitive accident reconstruction, the radar merge became a symbolic stand-in for the entire mystery. For UFO proponents, it appeared to show direct interaction between the jet and an unknown object. For sceptical investigators, it represented only the final stage of a conventional intercept followed by a probable aviation accident.
The Most Cautious Reading of the Radar Evidence
A careful reading of the Kinross radar evidence leads to a narrower but still significant conclusion. The radar operators almost certainly tracked an intercept in progress, and the interceptor probably closed to near visual range of another aircraft or radar contact over Lake Superior. Shortly afterwards, the F-89 disappeared from communications and radar tracking.
Beyond that point, the radar evidence becomes much less decisive.
The merge itself was consistent with ordinary radar behaviour for closely spaced targets on 1950s ground-controlled interception systems. It does not independently demonstrate collision, hostile action, or extraordinary technology. At the same time, it remains important because it establishes timing and sequence: the disappearance happened during the intercept phase rather than randomly elsewhere in flight. [openskiesproject.org]openskiesproject.orgOpen Skies ProjectOur goal is to preserve and display the history of this legendary Cold War radar station and its place in the local his… [Wikipedia]WikipediaFelix MonclaThe USAF reported that Moncla had crashed into Lake Superior while tracking a Royal Canadian Air Force (RCAF) C-47 aircraf…
That balance explains why the Kinross incident continues to attract debate. The radar data is neither meaningless nor conclusive. It provides enough structure to sustain the mystery, but not enough precision to resolve it.
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Endnotes
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Source: openskiesproject.org
Link: https://www.openskiesproject.org/news/kinross-incidentSource snippet
The Kinross IncidentDuring that era, radar resolution was relatively low, causing targets in close proximity to merge on the radar screen...
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Source: Wikipedia
Title: Ground-controlled interception
Link: https://en.wikipedia.org/wiki/Ground-controlled_interception -
Source: wiki.ivao.aero
Link: https://wiki.ivao.aero/en/home/specialoperations/so-training-documentation/SpecialOperationsFlying/GCISource snippet
Radar returns/tracks have come together. ICs will refer to fighters in MERGED state when the system's resolution capability is limited or...
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Source: Wikipedia
Link: https://en.wikipedia.org/wiki/Felix_MonclaSource snippet
Felix MonclaThe USAF reported that Moncla had crashed into Lake Superior while tracking a Royal Canadian Air Force (RCAF) C-47 aircraf...
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Source: visitkeweenaw.com
Link: https://www.visitkeweenaw.com/blog/post/missing-in-the-keweenaw-the-kinross-incident/Source snippet
Missing in the Keweenaw | The Kinross Incident20 Nov 2023 — The two aircraft appeared to converge on the control screen at Calumet, then...
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Source: mibsar.com
Title: USAFcrash Report
Link: https://www.mibsar.com/Cases/PukaskwaPlaneWreck/USAFcrashReport.pdfSource snippet
REPORT OF AIRCRAFT ACCIDENT Use this form in...24 Nov 2025 — The radar return from the other aircraft indicated it was continuing on its...
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Source: science.howstuffworks.com
Title: ufo government4
Link: https://science.howstuffworks.com/space/aliens-ufos/ufo-government4.htmSource snippet
HowStuffWorksThe 1953 Kinross UFO IncidentRadar operators watched the aircraft close in on the UFO, and then something fantastic happened...
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Source: openskiesproject.org
Link: https://www.openskiesproject.org/news/gciSource snippet
Ground-Controlled InterceptionThis allowed a single radar station to provide a complete 360 degree view of the airspace around the statio...
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Source: marconiradarhistory.pbworks.com
Link: https://marconiradarhistory.pbworks.com/w/file/fetch/139431675/MWT%20Report%201949%20-%20RAF%20Ground%20Control%20Interception%20System%20of%20RAF.pdfSource snippet
Tab RADAR GROUND CONTROL INTERCEPTION...Develop a method whereby information from any two at any time of the following equipments, 12 metre...
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Source: Wikipedia
Title: AMES Type 80
Link: https://en.wikipedia.org/wiki/AMES_Type_80 -
Source: openskiesproject.org
Link: https://www.openskiesproject.org/Source snippet
Open Skies ProjectOur goal is to preserve and display the history of this legendary Cold War radar station and its place in the local his...
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Source: raf.mod.uk
Link: https://www.raf.mod.uk/our-organisation/stations/raf-boulmer/news/80th-anniversary-of-the-first-ground-control-intercept-radar-site/Source snippet
Royal Air Force80th Anniversary of the First Ground Control Intercept...1 Jan 2021 — Three advances combined to solve the night-time int...
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Source: airuniversity.af.edu
Link: https://www.airuniversity.af.edu/Portals/10/AUPress/Books/B_0152_Degering_Radar_Contact.pdfSource snippet
Contact - Air Universityby R DeGering · Cited by 1 — Interceptor aircraft were to be under ground control, who directed them to intercept...
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Source: michigan.org
Link: https://www.michigan.org/property/open-skies-projectSource snippet
Open Skies Project | MichiganWe give guided tours of this Historical Cold War Radar Station. We have 100 acres with over 70 structures on...
Additional References
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Source: facebook.com
Link: https://www.facebook.com/groups/1810956959059610/posts/1814867542001885/Source snippet
Raf blackgang, gci radar stationA GCI (ground control interception) radar station was used to guide fighter planes onto hostile or unide...
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Source: therafatomahabeach.com
Link: https://www.therafatomahabeach.com/the-reason-for-ground-control-intercept-units/Source snippet
The Reason for Ground Control Intercept UnitsThe boffins within the RAF radar section were improving the capabilities of what radar could...
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Source: shortform.com
Link: https://www.shortform.com/podcast/episode/conspiracy-theories-2025-05-21-episode-summary-the-kinross-incident-did-a-ufo-abduct-an-entire-jetSource snippet
The Kinross Incident: Did a UFO Abduct an Entire Jet?21 May 2025 — The initial UFO theory, proposed by NICAP director Donald Kehoe, sugge...
Published: May 2025
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Source: uppermichiganssource.com
Link: https://www.uppermichiganssource.com/2023/11/23/70-years-later-researchers-talk-kinross-incident-research-progress-open-skies-project/Source snippet
[https://www.uppermichiganssource.com70-year](https://www.uppermichiganssource.com70-year) anniversary of Kinross Incident: researchers talk...22 Nov 2023 — 70 years ago, an unexplain...
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Source: facebook.com
Title: heres a terrifying one in 1953 an air traffic controller watched a blip appear o
Link: https://www.facebook.com/mrballen/posts/heres-a-terrifying-one-in-1953-an-air-traffic-controller-watched-a-blip-appear-o/807058585026310/Source snippet
Here's a terrifying one: In 1953, an air traffic controller...A fighter jet was sent to intercept it, but both disappeared from radar se...
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Source: facebook.com
Title: in this untold story we look at identification friend or foe mk ii iff mk ii whi
Link: https://www.facebook.com/rafmuseumcosford/posts/in-this-untold-story-we-look-at-identification-friend-or-foe-mk-ii-iff-mk-ii-whi/1252519940240591/Source snippet
The Royal Air Force Museum MidlandsIn 1958, short lived as it was, RAF Hartland ceased working as Ground Control Intercept station, and i...
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Source: yahoo.com
Title: The blip of the unidentified object “veered in another direction and vanished
Link: https://www.yahoo.com/news/kinross-incident-alien-encounter-fatal-120000982.htmlSource snippet
YahooThe Kinross Incident: Alien encounter or a fatal flight error?23 Nov 2024 — The crew watched as the two signals merged into one on t...
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Source: facebook.com
Title: Marie, Michigan, detected an unidentified object breaching restricted airspace
Link: https://www.facebook.com/LostInMichigan.net/posts/the-kinross-incidenton-november-23-1953-radar-operators-at-sault-ste-marie-michi/1391472015669609/Source snippet
89C interceptor, piloted by Captain Felix Moncla and radar...The Kinross Incident On November 23, 1953, radar operators at Sault Ste...
Published: November 23, 1953
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Source: facebook.com
Link: https://www.facebook.com/VisitKeweenaw/posts/tucked-deep-in-the-keweenaw-woods-the-open-skies-project-a-former-calumet-air-fo/1207746814733207/Source snippet
Tucked deep in the Keweenaw woods, the Open Skies...The UP, back during the Cold War, was a hot bed of military activity...
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Source: reddit.com
Title: that time a jet disappeared chasing a ufo over
Link: https://www.reddit.com/r/UFOs/comments/1dugs4g/that_time_a_jet_disappeared_chasing_a_ufo_over/Source snippet
A look back at the 1953 Kinross Incident": r/UFOsThe radar objects merging until they become one point--that's called a "merge plot", de...
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