Inversions: 2 deg from 700 to 1500 ft., 1 deg from 9600 to 10.000 ft., otherwise normal
Normal
Speed 20 to 35 mph, followed curved course from 15 miles south of Arcola over Manassas, La Plata and McLean
7-en
Not available
1
X
Quantico
2000
National 42
Not available for locality
Not available for locality
No details available
7-en
0300
1
X
Blue-White
60 Miles Southwest DCA
11,000
Capt. Bruen National
DCA: Surface inversions 6 deg below 10,000 ft.
DCA: low, below measuring limits at 11,000 ft.
Came up to altitude of aircraft, hovered 2 miles to left of northbound aircraft. Pilot turned on all lights.
Ball of light took off, going up and away.
7-en
2112
6
X
Red
Vicinity Langley Field
1000 to 2000
Pan-American Ferry 901
Norfolk: Superadiabatic lapse rate around 9000 ft. DCA: surface inversion 2 deg.
Norfolk: high, but fell off at 6000 ft. DCA: sharp fall at 6000 ft.
Estimated speed 1000 miles per hour, heading northest with sudden change to west-southwest
7-en
2340
8
X
X
East and South ADW
Center
DCA: surface inversion 3 deg isothermal between 8000 and 10.000 ft.
DCA: Above 10,000 dropped, then increased slightly, dropping again at 15,000 ft.
Fair to weak targets, speed 100 to 130 miles per hour.
7-en
0100
7
X
DCA to Martinsburg
Capitol 807
DCA: surface inversion 3 deg isothermal between 8000 and 10,000 ft.
DCA: Above 10,000 ft. dropped, then increased slightly, dropping again at 15,000 ft.
Lights moved rapidly up, down, and horizontally. Also hovered.