Jeff Knox Profile picture
Mar 9, 2023 10 tweets 7 min read Read on X
#ufotwitter #ufohistory
Today in UFO History - The Selfridge AFB Incident
March 9, 1950 — Selfridge AFB, Michigan
1/7:45 p.m. A crew of three radar controllers at Selfridge Air Force Base [now Selfridge Air National Guard Base] near Mount Clemens, Michigan, is busy monitoring the
2/ night flying units of the 56th Fighter-Interceptor Group. 1st Lt. Francis E. Parker, 1st Lt. Frank K. Mattson, Sgt. McCarthy, and Cpl. Melton observe an intermittent target on the height range indicator (HRI) scope of the CPS-4 radar at 47,000 feet altitude and higher. Further
3/ indications of what Parker describes as a well-defined, clear target like an aircraft are picked up with increasing regularity over the next 45–60 minutes. During this time, the target seems to stay in the area where the F-80s are flying, but 20,000 feet above them. The radar
4/operators are monitoring two different systems—a CPS-5 radar operating on long-wave frequencies at 40,000 feet, and a CPS-4 radar operating on short-wave frequencies—and the target appears on both scopes simultaneously without fade. The speed varies from a hover in low-density
5/air to nearly 1,500 mph, well in excess of the fastest operational jet at the time, and a climb rate of up to 7,000 feet per minute. [Eberhart]

Sources:
Brad Sparks, Blue Book Unknown File, Case 341, p. 84;
Hynek UFO Report, pp. 123–126;
Hynek UFO Report, pp. 295–297;
Jerome Clark, The UFO Encyclopedia, 3rd Ed., pg.1047–1049;
NICAP, “The Selfridge AFB Incident”;
nicap.org/500309selfridg…
Read the full coverage of this case in NARCAP's Radar Catalog (RADCAT) by Martin Shough. Pages 12-20.
static1.squarespace.com/static/5cf80ff…

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More from @mrjeffknox

Sep 12, 2023
#ufotwitter #ufohistory
Today in UFO History - The Flatwoods Monster Case
September 12, 1952 — Flatwood, WV
1/Around 7:15 p.m., in Flatwoods, West Virginia, two brothers, Edward and Fred May, and their friend Tommy Hyer (ages 13, 12, and 10 respectively) witness a bright object Image
2/cross the sky, coming to rest on land belonging to local farmer G. Bailey Fisher. The boys go to the home of the May brothers’ mother, Kathleen May, where they tell the story of having seen a UFO crash land. From there, Mrs. May, accompanied by the three boys, local children Image
3/Neil Nunley, 14, and Ronnie Shaver, 10, and West Virginia National Guardsman Eugene Lemon, 17, walk to the Fisher farm. At the top of a hill, they reportedly see a large pulsating “ball of fire” about 50 feet to their right. They also detect a pungent mist that makes their eyes Image
Read 78 tweets
Aug 14, 2023
#ufotwitter #ufohistory
Today in UFO History - Lakenheath-Bentwaters incident
August 13–14, 1956 — RAF Bentwaters-Lakenheath, England
1/9:30 p.m. A radar-visual UFO sighting begins at RAF Bentwaters [now Bentwaters Parks], Suffolk, England. A blip traveling approximately 4,000– Image
2/8,000 mph on an east-west course is picked up on radar. It moves in a straight line to a position about 15 miles northwest of Bentwaters. Within a few minutes, about a dozen normal targets are spotted 8 miles southwest, moving northeast at about 100 mph. In front of the targets Image
3/are three objects in a triangular formation, about 1,000 feet apart. All the targets then appear to converge into one extremely large target (several times the size of a B-36), which continues moving to the northeast, then stops for a few minutes, then resumes, and is lost to Image
Read 49 tweets
May 19, 2023
#ufotwitter #ufohistory
Today in UFO History - Pre-Arnold - Disk Seen By Navy Vet and Railway Workers
May 19, 1947 — Manitou Springs, Colorado
1/Around 12:30 p.m. Navy veteran Dean A. Hauser and six other Pike’s Peak Railway workers (including Ted Weigand, Marion Hisshouse, Image
2/T. J. Smith, L. D. Jamison) at Manitou Springs, Colorado, are taking a lunch break when they watch a silver object come in from the northwest, hover overhead, and gyrate at 1,000 feet. The UFO is moving “erratically in wide circles” and reflects light like it is made of metal. Image
3/After 20 minutes it disappears in a straight line to the west-northwest. [Eberhart]

Sources:
“Manitou Vets Relate Story: Another ‘Disk’ Seen,” Denver Post, June 28, 1947, p. 1;
Denver Post, June 29, 1947, p. 6;
Image
Image
Read 4 tweets
Mar 10, 2023
#ufotwitter #ufohistory
Today in UFO History - JANAP 146(C) Issued
March 10, 1954 —
1/JANAP 146 (C), “Communications Instructions for Reporting Vital Intelligence Sightings from Aircraft and Waterborne Sources.” This directive allows waterborne sources for CIRVIS and adds MERINT
2/ reports. Civilian pilots must also report UFOs to the Air Force and refrain from talking about it. [Eberhart]

Sources:
Timothy Good, Above Top Secret, p. 283;
Joint Chiefs of Staff, Joint Communications–Electronics Committee, “JANAP 146(C) Communications Instructions for Reporting Vital Intelligence Sightings from Airborne and Waterborne Sources,” March 10, 1954;
cufon.org/cufon/janp146c…
Read 5 tweets
Mar 10, 2023
#ufotwitter #ufohistory #aviationhistory
Today in Aviation History - First Jet Aircraft To Exceed 1,000 mph in Level Flight.
March 10, 1956 —
British pilot Peter Twiss reaches an official airspeed of 1,132 mph in a Fairey Delta 2 over Chichester, England.
Source:
Newsweek (US Edition) 1956-03-26: Vol 47 Iss 13, Page 45;
"Getting the Record". Flight Magazine. Flight Global. 23 March 1956.
[Internet Archive only seemed to mirror the first page of this article]
web.archive.org/web/2012110217…
Wikipedia, “Peter Twiss”
en.wikipedia.org/wiki/Peter_Twi…
Read 14 tweets
Mar 10, 2023
#ufotwitter #ufohistory
Today in UFO History - Violent Humanoid Encountered in Bolivia
March 10, 1968 — bt. Otoco and Uyuni, Bolivia
1/6:00 p.m. Valentina Flores is bringing in her llamas on her farm between Otoco and Uyuni, Bolivia, when she discovers that her sheep pen is
2/covered with a net made of some plastic-like material, and that inside the pen is a helmeted being, 3.5 ft tall, who is engaged in killing her sheep using a tubular instrument with a hook on the end. Flores throws stones at the being, whereupon he walks over to an instrument
3/resembling a radio and, moving a wheel on it, quickly absorbs all the netting. The woman approaches the pen with a cudgel, upon which the being throws its instrument at her several times; it returns to him like a boomerang, after it inflicts superficial cuts on her arms. The
Read 7 tweets

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