Cases and themes
Events where objects were tracked on radar, often alongside visual sightings. 56 events, newest first.
Military29 Jul 1952
An Air Defense Command radar in central Michigan tracked a fast target over Saginaw Bay and vectored an F-94. The crew reported a bright light and a brief airborne radar lock-on before the target pulled away. Blue Book chief Edward Ruppelt later wrote that it had no good explanation.
Photo: US Air Force, Public domain
Military19 Jul 1952
On two weekends in July 1952, radar at Washington National Airport and Andrews AFB tracked unexplained targets, some matched by pilot sightings, and jets were sent to intercept. The Air Force publicly suggested temperature inversions as a likely cause.
Photo: Warren K. Leffler, Public domain
Sightings14 Jul 1952
The crew of a Pan American airliner flying from New York to Miami reported eight UFOs near Newport News, Virginia. Blue Book chief Edward Ruppelt lists it among the July 1952 reports leading up to the Washington radar sightings later that month.
SightingsJul 1952
1952 brought the Air Force more UFO reports than any year before, about eight times the totals for each of the previous two years per the Condon Report. Project Blue Book chief Edward Ruppelt dated the 'Big Flap' from about June 1, with reports peaking in July, including the Washington radar cases.
Photo: Associated Press, Public domain
Military10 Sep 1951
Army Signal Corps radar at Fort Monmouth tracked fast and high targets over two days, and a T-33 crew reported an object near Sandy Hook. The reports reached Gen. Charles Cabell and led to a revived Project Grudge under Edward Ruppelt; investigators later blamed an airplane and balloons.
Photo: Acroterion, CC BY-SA 4.0
Government8 Jul 1947
An FBI Dallas teletype relayed what Eighth Air Force headquarters told agents about the object recovered near Roswell: a hexagonal object hung from a balloon that resembled a high-altitude weather balloon with a radar reflector, being flown to Wright Field for examination.
Photo: Roswell Daily Record, Public domain
