Six cases from April 1952, headlined by the Toronto Corridor Wave and the Flint, Michigan drive-in sighting, marking the start of that year's great UFO flap.
1952: April UFO|UAP & Entity Sightings Archive
April 1952 marks the true beginning of that year’s “great flap” — the dramatic escalation in reported sightings that would culminate in July’s famous Washington, D.C. incident. The month’s centerpiece is the Toronto Corridor Wave, one of the most thoroughly multi-witnessed and multi-instrument-corroborated cases in the entire Canadian record, documented in full via the standalone report linked below. The month also brought a detailed, richly narrated contact case near Nîmes, France, a Flint, Michigan drive-in sighting of up to 180 objects, and a dense, near-daily run of military radar and visual cases spanning Korea, Japan, Germany, and across the United States.
Date: April 2, 1952
Location: Lake Mead, Nevada
Time: 9:00 a.m.
Summary: While on a fishing trip with his wife and a friend, a man observed a silver, very large object at tremendous altitude, described as resembling a B-36 bomber without wings.
Source: Unknown
Date: April 3, 1952 (BBU)
Location: Marana, Arizona
Time: 8:15 a.m. (possibly 8:23-9:15 a.m. MST)
Summary: The pilot of a T-6 aircraft and six pilots on the ground saw a bright, aluminum, shiny, oblong object above 54,000 feet for 52 minutes.
Source: Project 1947; FUFOR Index
Date: April 4, 1952 (BBU 1095)
Location: Duncanville, Texas
Time: 8:30 p.m. CST
Summary: USAF Cpl. Billy D. Greer and PFC John W. Harrington of the Radar Maintenance Section, 147th AC&W Squadron, tracked an unidentified target by FPS-10 radar to the northwest at roughly 80 miles, moving at approximately 2,160 knots (2,500 mph), until it disappeared off the scope at maximum range (about 300 miles). Altitude was estimated at 42,000+ feet based on radar beam coverage at maximum range.
Source: Jan Aldrich; FUFOR Index
Date: April 5, 1952
Location: Kadena AFB, Okinawa
Time: Approximately midnight local time
Summary: A/1C P. T. Burnett, T/Sgt. S. Ball, A/1C J. W. Johnston, and A/1C J. C. Holder of the 372nd Bomb Squadron, in the tent area, watched an unidentified object fly an erratic course from the north horizon to the base area, then maneuver over the base with violent, high-speed zigzagging, stop momentarily, and maneuver further before shooting up out of sight to the west. All maneuvering exceeded the speed of any conventional jet aircraft, estimated at 1,000 knots. The object was a steady, noiseless white light at an estimated 20,000 feet, observed for a total of 10 minutes.
Source: Blue Book files; Dan Wilson
Date: April 5, 1952 (BBU 1096)
Location: Phoenix (possibly Glendale), Arizona
Time: 10:40 a.m.
Summary: Mr. and Mrs. L. G. Ryan, R. L. Stokes, and D. Schook saw a large, dull gray, circular object, followed by two more, fly straight and level at high speed.
Source: Berliner
Date: April 5, 1952 (BBU 1097)
Location: Miami, Florida
Time: 9:15 p.m.
Summary: L. E. VanDercar and his 9-year-old son saw four dark, circular objects with fuzzy edges cross the face of the nearly full moon, each about half the moon’s angular size.
Source: Berliner
Date: April 6, 1952 (BBU 1099)
Location: Temple, Texas (possibly near Miller-Gaughan AFB)
Time: 2:59 p.m.
Summary: H. L. Russell saw 50-75 gray-white discs continually change position within a formation, tilting in unison every 12-15 seconds.
Source: Berliner
Date: April 8, 1952
Location: Near Big Pines, California
Time: Unknown
Summary: A disc-like UFO was observed by a TV network engineer.
Source: Unknown
Date: April 9, 1952 (BBU)
Location: Between Shreveport and Barksdale AFB, Louisiana
Time: 2:30 p.m. CST
Summary: A USAF C-46 pilot and copilot, flying east at 9,000 feet, saw a 30-40-foot, cream-colored, disc-shaped object ahead at about 4,000 feet; the object reversed course, both aircraft made 360-degree turns, and the object climbed into clouds at 12,000 feet at 200-400 mph. A similar sighting occurred 15 minutes later by another C-46 five to six miles north of Barksdale AFB, of an object disappearing on a northern heading at 11,000 feet.
Source: Blue Book Status Report 6; cf. NARCAP
Date: April 9-10, 1952 (BBU)
Location: 6 miles west of Pecos, Texas (possibly near Lackland AFB)
Time: 10:40 p.m. CST
Summary: No further summary detail survives beyond the date, location, and time in the compiled record.
Source: Hynek, The UFO Report, p. 43; FUFOR Index
Date: Late night, undated (widely reported alongside April 1952 entries)
Location: Near Nîmes, France
Time: Late night
Summary: A witness staying at an isolated stone building was awakened by her dogs growling and went out to investigate, encountering three giant, human-like figures and a smaller, ordinary-looking human who spoke perfect French and acted as translator. The giants, well-built and dark-complexioned, resembled “Hindus” in appearance; the eldest, apparently the leader, had a half-marble embedded in his forehead and wore a strap holding a box of buttons around his neck. The translator claimed the aliens had abducted him years earlier. The eldest giant explained they had originally introduced the first human colony on Earth as a penal colony, then showed the witness their craft — a huge, straw-hat-shaped vessel hovering silently nearby — and demonstrated levitation and dematerialization. Before departing, they told her they had come to collect vegetation and mineral samples to evaluate the consequences of atomic explosions. The witness reported numerous psychic experiences afterward.
Source: Joel Mesnard, MUFON Journal #309
Date: April 12, 1952 (BBU 1108)
Location: North Bay CFS, Ontario, Canada
Time: 9:30 p.m.
Summary: RCAF Warrant Officer E. H. Rossell and Flight Sgt. R. McRae saw a round, amber object fly fast, stop, reverse direction, and climb away at a 30-degree angle.
Source: Berliner
Date: April 12 or 13, 1952 (BBU)
Location: Moriarty AFS, New Mexico
Time: 4:45 p.m. MST
Summary: Four USAF airmen saw a silver, disc-shaped object to the east traveling very erratically at high speed, then diving; possibly confirmed by CPS-5 radar tracking.
Source: McDonald files; Jan Aldrich; Blue Book Report 6; FUFOR Index
Date: April 14, 1952 (BBU, CIRVIS Report)
Location: La Crosse, Wisconsin
Time: 12:35 p.m.
Summary: A Central Airlines pilot saw several light-colored objects flying in V-formation at tremendous speed; also sighted from the ground.
Source: Berliner
Date: April 14, 1952 (BBU 1112)
Location: Memphis, Tennessee
Time: 6:34 p.m.
Summary: U.S. Navy pilots Lt. j.g. Blacky and Lt. j.g. O’Neill, flying at 2,000 feet over the NAS Range Station, saw to their left an inverted bowl glowing bright red, roughly 3 feet long and 1 foot high, with vertical slots, approaching at high speed and passing about 300 feet from their aircraft, below an overcast at 4,200 feet.
Source: Berliner; McDonald files; Jan Aldrich; cf. NARCAP
Date: April 15, 1952 (BBU 1115)
Location: Santa Cruz, California
Time: 7:40 p.m.
Summary: Mr. Hayes, brother of a Master Sergeant, saw two faint objects flying fast along the horizon through a 20x spotting telescope.
Source: Berliner
Date: April 16, 1952
Location: Madison, Wisconsin
Time: 8:15 p.m. CST
Summary: Dino Laurenzi observed five to six yellowish-white, glowing, semi-circular objects in a semi-circular formation, nearly straight up, heading east at high speed. After a few seconds they turned sharply left to a northwest heading, gained altitude rapidly, and appeared to fuse together before disappearing, with no sound heard throughout. F-80 and F-86 aircraft were dispatched to investigate; Arthur Prchlik also witnessed the sighting.
Source: Dan Wilson; Blue Book files
Date: April 16, 1952 (BBU)
Location: Shreveport, Louisiana
Time: 9:28 p.m. CST
Summary: Senior USAF pilot Capt. E. Maths (possibly Mathis or Matthis) observed a course-reversing light for 70 seconds.
Source: Willy Smith, pp. 25-29; FUFOR Index
Date: April 17, 1952
Location: Nellis AFB, Nevada
Time: Unknown
Summary: A large group of circular UFOs was reported.
Source: UFOE, III
Date: April 17 or 18, 1952 (BBU 1127)
Location: Yuma Test Station, Arizona
Time: 3:05 p.m. MST
Summary: A group of Army weather observation students, including several graduate engineers, saw a flat-white, circular object fly an irregular trajectory with a brief trail.
Source: Berliner
Date: April 17, 1952
Location: Alaska / Atlantic (nationwide scope)
Time: 7:00 p.m.
Summary: A nationwide Air Defense alert was triggered by vapor trails and radar detections indicating a possible Soviet attack.
Source: Jan Aldrich
Date: April 17 or 13, 1952 (BBU 1124)
Location: Longmeadow, Massachusetts
Time: 8:30 p.m.
Summary: S. B. Brooks and chemical engineer J. A. Eaton saw a round, deep orange object fly fast and erratically, occasionally emitting a shaft of light to the rear.
Source: Berliner
Date: April 18, 1952 (BBU 1128)
Location: Bethesda, Maryland
Time: 11:30 a.m. (possibly 1:30 p.m.) EST
Summary: Witnesses including R. Poerstal (possibly Parstel), Mirage, Watkins, and another man (possibly Young) saw 7-9 circular, orange-yellow lights in a 40-degree V-formation fly silently overhead from south to north.
Source: Berliner; FUFOR Index
Date: April 18, 1952 (BBU 1129)
Location: Corner Brook, Newfoundland, Canada
Time: 4:00 (possibly 3:30) a.m.
Summary: Janitor C. Hamilton saw a yellow-gold object make a sharp turn, leaving a short, dark trail.
Source: Berliner; FUFOR Index
Date: April 18, 1952 (BBU 1131)
Location: Corner Brook, Newfoundland, Canada
Time: 10:10 (possibly 9:40) p.m.
Summary: Reporter Chic Shave saw a round, yellow-gold object fly south, then return — a second, separate sighting the same day at the same location as the earlier entry.
Source: Berliner; FUFOR Index
Date: April 18 or 19, 1952 (BBU 1130)
Location: 50 miles northwest of Kyushu, Japan
Time: 12:07 p.m. (possibly 9:07 p.m.)
Summary: A radar operator tracked an unidentified target at 2,700 (possibly 2,100) mph. Separately, T-6 pilot Lt. D. C. Brigham reported to ATIC seeing a small, disc-shaped object close in on a fighter and maneuver around it.
Source: Berliner; FUFOR Index
Date: April 19, 1952
Location: Pork Chop Hill, Korea
Time: 1:00 p.m.
Summary: Four American Army airmen reported a white, rounded, delta-shaped object flying at 60-80 mph over Communist territory on the Korean western front, in the Old Baldy-Pork Chop Hill area. An official G-2 Intelligence Report confirmed that aerial observers in two separate planes on routine reconnaissance missions independently observed the object.
Source: Associated Press; Blue Book files; Dan Wilson
Date: April 20, 1952 (BBU #14)
Location: Flint, Michigan
Time: 9:15-10:40 p.m.
Summary: A naval aviation student, his wife, and several others at a drive-in movie watched roughly 20 separate groups of aircraft-shaped objects — two to nine per group, up to 180 objects total — fly over in mostly straight lines with occasional standard-aircraft-style turns. Each object was surrounded by and glowing with a cherry-red halo, despite the cloudless night. Richard Haines’ later analysis estimated speeds exceeding 1,200 mph at 10,000-30,000 feet, ruling out flocks of birds given the speed involved. See the Full Report.
Source: U.S. Air Force Project Blue Book Special Report #14 (Battelle Institute Study); Brad Sparks; Richard Haines, “Project Delta”
Date: April 20, 1952
Location: Toronto, Ontario and the Buffalo-London-Centralia corridor, Canada
Time: Approximately 11:00-11:28 p.m.
Summary: Air traffic control at Cleveland Hopkins Airport received calls of objects sighted west of Toronto leaving vapor trails. Toronto ATC requested Niagara AC&W identify the objects. Three RCAF aircrew members saw four objects traveling east to west; Buffalo, London, and Centralia towers independently spotted vapor trails, with Centralia’s operator estimating the objects crossed horizon to horizon in three seconds at 30,000-35,000 feet. Approximately 15 RCAF F-51 and T-33 aircraft were airborne at the time, most pilots confirming the sightings, along with Trans-Canada Airlines pilots; one pilot independently tracked 11 objects on his own radar. See the Full Report.
Source: Canadian Department of National Defence documents; Dan Wilson
Date: April 22, 1952 (BBU 1144)
Location: Naha AFB, Okinawa
Time: 9:00 p.m.
Summary: The crew of a B-29 bomber, on the ground, saw an elliptical object, followed by two more objects and then another two, each with a white light blinking every one to two seconds, performing erratic maneuvers.
Source: Berliner
Date: April 24, 1952 (BBU 1147)
Location: Bellevue Hill, Vermont
Time: 5:00 a.m.
Summary: The crew of a USAF C-124 transport plane saw three circular, bluish objects in loose fingertip formation, two flying parallel to the aircraft.
Source: Berliner; Project 1947
Date: April 24, 1952 (BBU 1148)
Location: Great Blue Hill, near Milton, Massachusetts
Time: 2:30 p.m. EST
Summary: Air Force Cambridge Research Center electronics engineers Alfred P. Furnish and Herbert J. Brun, along with MIT electrical engineering senior Joseph Page, were in an observation tower atop Great Blue Hill and saw, to the northwest, two very thin, flat, dull reddish-orange, squarish objects (roughly 10-15 feet wide) with rounded, waist-pinched edges, flying in a wobbly, consistently undulating “swooping” motion at about 2,000 feet altitude. The objects climbed at roughly 15 degrees to an estimated 240 mph before flying away and disappearing due to distance, with no trail, exhaust, or sound noted across 70+ miles of visibility.
Source: Berliner; FUFOR Index; Loren Gross, UFOs: A History, January-May 1952
Date: April 24, 1952 (BBU 1151)
Location: Clovis, New Mexico
Time: 8:10 p.m.
Summary: USAF Flight Surgeon Maj. E. L. Ellis saw many orange-amber lights, sometimes separate and sometimes fused together, behaving erratically and varying speed from motionless to very fast.
Source: Berliner; FUFOR Index
Date: April 24, 1952
Location: Colorado Springs, Colorado
Time: 10:15 p.m.
Summary: A civilian report in Blue Book files, though not a Blue Book Unknown. Per the Project 10073 record card: a dark object with a luminous glow, swept wing, and no fuselage, executing straight and level maneuvers; possibly a conventional aircraft except for the total absence of sound, which would have been audible given the object’s apparent size — described as ten times larger than a jet aircraft — viewed through bare tree branches before disappearing behind a roofline.
Source: Project 10073 Record Card
Date: April 25, 1952 (BBU)
Location: Darmstadt, West Germany
Time: 9:15 p.m.
Summary: An Air Force instructor pilot, Capt. Wienieski, and his copilot in a C-47 observed a brilliant white, circular object at roughly 2,000 feet over Darmstadt. Wienieski took evasive action when the light appeared to be on a collision course; the main Rhein Tower and Frankfurt Airways confirmed no other aircraft were in the area. The object was last seen climbing at high speed to the northwest.
Source: Weinstein; Jan Aldrich; FUFOR Index
Date: April 25, 1952
Location: San Jose, California
Time: Approximately 11:00-11:15 a.m.
Summary: Two scientists — a biochemist (“Dr. W”) and a bacteriologist (“Dr. Y”) — saw a small, metallic, tilted disc, 4-5 feet in diameter, wobbling like the motion of a water-meter dial roughly 50 feet overhead. Moments later they saw three black, motionless objects at high altitude, roughly 100 feet in diameter, “jittering” together like boats in a stream; as the small disc suddenly climbed away toward Mt. Hamilton, one black object followed on a converging course, and both vanished into the clouds together. Dr. W considered the propulsion method unlike anything in known physics and found the sighting deeply disturbing, but ultimately declined to file an official report to the Air Force out of fear of ridicule. See the Full Report.
Source: NICAP; Dr. James E. McDonald
Date: April 27, 1952 (BBU 1160)
Location: Roseville, Michigan
Time: 4:15 p.m.
Summary: H. A. Freytag (possibly Freitag) and three male relatives, including a minister, saw a silver oval roll, descend, and stop; two silver, cigar-shaped objects then appeared, one departing east and one west, and a third silver cigar flew past at high speed.
Source: Berliner; FUFOR Index
Date: April 27, 1952 (BBU)
Location: Pontiac, Michigan
Time: 11:06 p.m.
Summary: A witness observed an object roughly 200 feet in diameter and roughly 200 feet off the ground; this case was labeled insufficient data by Project Blue Book.
Source: Unknown
Date: April 27, 1952 (BBU 1163)
Location: Yuma, Arizona
Time: 8:30 p.m.
Summary: Off-duty control tower operator M/Sgt. G. S. Porter and his wife saw bright red or flame-colored discs, appearing as large as fighter planes, in seven sightings of a single disc and one sighting of two in formation, all below an 11,000-foot overcast.
Source: Berliner
Date: April 27, 1952
Location: Birmingham (northwest of Detroit), Michigan
Time: 10:45-11:15 p.m. (possibly 10:06 p.m.)
Summary: The Hoffman family of four, in a car, saw a brilliant white, round, flat object with two tiers of windows descend from the northeast, hover with a rocking motion at roughly 15-degree elevation, stop and start at about 100 mph drifting northwest. The witnesses pursued in their car; the object’s lights went off and on four times, changing color between white and orange. They gathered four additional witnesses and called police, the Detroit Times newspaper, and Selfridge AFB before the object disappeared over treetops to the northwest. Possibly the same witnesses involved in later May and June 1952 cases documented elsewhere.
Source: Hynek, The UFO Report, pp. 70-73; FUFOR Index
Date: April 28, 1952
Location: Homewood, Illinois
Time: 5:00 p.m.
Summary: Two civilian witnesses reported to the Air Force that an object resembling a white parachute appeared to circle a large airplane for about three minutes; not listed among Blue Book Unknowns.
Source: CCPBBU
Date: April 29, 1952 (BBU 1167)
Location: Marshall, Texas
Time: 3:30 p.m.
Summary: Private pilot R. R. Weidman (possibly Weedsman) saw a round, white object fly straight with a side-to-side oscillation.
Source: Berliner; FUFOR Index
Date: April 28 or 29, 1952 (BBU 1168)
Location: North of Goodland, Kansas
Time: 10:00 p.m.
Summary: B-29 bombardier Lt. R. H. Bauer saw a white, fan-shaped light pulsing three to four times per second.
Source: Berliner; Project 1947
Date: April 30, 1952 (BBU)
Location: Moriarty AFS, New Mexico
Time: 7:40 and 7:46 a.m. MST
Summary: CPS-5 radar tracked a first target at 4,000 mph, 230° azimuth, 149 miles range, moving 11 miles per 10-second sweep across 4 sweeps, heading toward the radar site. A second track at 7:46 a.m. showed a 4,000 mph target at 280° azimuth, 140 miles range, moving the same rate across 6 sweeps before disappearing at about 70 miles. A third radar case at this same station within roughly two weeks of the April 12-13 sighting above.
Source: McDonald files; Jan Aldrich; FUFOR Index
EXECUTIVE SUMMARY
The Flap Begins in Earnest
April 1952 is where this archive’s record visibly shifts gears — not a single dramatic case but a near-daily accumulation of military radar tracks, formation sightings, and civilian reports across four continents, building directly toward the summer’s Washington, D.C. flap. The Toronto Corridor Wave stands as the month’s most thoroughly corroborated case, its cascading confirmation across four control towers, dozens of aircraft, and independent airborne radar giving it a documentary solidity matched by very few cases in this archive. The Flint, Michigan drive-in sighting, with its startling estimate of up to 180 objects, and the Great Blue Hill case, witnessed by working radar engineers and an MIT senior, round out a month that reads less like a series of isolated incidents than like the visible opening movement of a genuinely escalating wave.
They flew from horizon to horizon in three seconds.
— Multiple independent witnesses, on the April 20, 1952 Toronto Corridor Wave, Ontario, Canada
