28938573.pdf

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ATIC NO. ---
AF NO. ---
REPORT NO. ---
DATE OF REPORT ---
TIME OF SIGHTING 0930
SHAPE Round
SIDE Silver Dollar
COURSE ---
NO. IN GROUP 1
MOUND ---
PREMIES ---
SKETCHES ---

DATE OF INFO 3 Nov 50
LOCATION San Francisco, Calif.
SOURCE Civilian
DATE IN TO ATIC ---
COLOR White
SPEED ---
ALTITUDE 20,000'
LENGTH OF TIME OBSERVED 20-30 Min.
TYPE OF OBSERVATION Ground
MANEUVERS ---

Temporary ATIC Form 329
(2 Jan 52)

Brecow

14

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
WASHINGTON

5D-OSI/JEM/ejh

UNCLASSIFIED

THE INSPECTOR GENERAL, USAF
5TH DISTRICT OFFICE OF SPECIAL INVESTIGATIONS
WRIGHT-PATTERSON AIR FORCE BASE, DAYTON, OHIO

IN REPLY REFER TO: 5D 24-21

8 November 1950

SUBJECT: UNIDENTIFIED OBJECT
Observed directly overhead San Francisco, California at approximately 0930 hours, 3 November 1950

TO: Commanding General
Air Materiel Command
Wright-Patterson Air Force Base
Dayton, Ohio
Attention: MCIS

1. Attached hereto for your information and necessary action are copies of a letter from…

UNCLASSIFIED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
WASHINGTON
THE INSPECTOR GENERAL USAF
19th DISTRICT OFFICE OF SPECIAL INVESTIGATIONS
FAIRFIELD-SUISUN AIR FORCE BASE, CALIFORNIA

19D OSI 24/40 SIR-16 3 November 1950

SUBJECT: UNIDENTIFIED OBJECT
Observed directly overhead San Francisco,
California at approximately 0930 hours,
3 November 1950

TO : Director of Special Investigations,
Headquarters USAF,
Washington 25, D. C.

1. SYNOPSIS: Unusual object observed in sky directly
overhead San Francisco at 0930 hours, 3 November 1950.

2. DETAILS: On 3 November 1950 Mr. …

1

the 1200 mp. surface is obtained from the nonogram in the upper left-hand corner by drawing a straight line from the point t on the temperature scale through the point p, (mean sea level or station pressure) on the pressure scale, and reading the height on the height scale.

NOTES: 1. If the sounding reaches above the 120 mp. level, the top of the sounding will be plotted using the pressures indicated in brackets ( ) along the left-hand margin. This part of the curve will then be a pressure-temperature plot, and not a T, log p-plot.

2. This diagram is in all physical respects equivalent to…

1

PUBLISHED BY THE AERONAUTICAL CHART SERVICE, U.S. AIR FORCE WASHINGTON, D.C.
JUNE 1948 (C&SS) BASE NO. 1

HEIGHT in met
(1)
450
(2)
(3)
920
(4)
(5)
350
(6)
(7)
350
(8)
(9)
350
(10)
(11)
400
(12)
(13)
450
(14)
(15)
500
(16)
(17)
550
(18)
(19)
600
(20)
(21)
650
(22)
(23)
700
(24)
(25)
750
(26)
(27)
800
(28)
(29)
850
(30)
(31)
900
(32)
(33)
950
(34)
(35)
1000
(36)
(37)
1050
(38)
(39)
1100
(40)
(41)
1150
(42)
(43)
1200
(44)
(45)
1250
(46)
(47)
1300
(48)
(49)
1350
(50)
(51)
1400
(52)
(53)
1450
(54)
(55)
1500
(56)
(57)
1550
(58)
(59)
1600
(60)
(61)
1650
(62)
(63)
1700
(64)
(65)
1750
(66)
(67)…

GRAM

![img-1.jpeg](img-1.jpeg)

![img-2.jpeg](img-2.jpeg)

![img-3.jpeg](img-3.jpeg)

![img-4.jpeg](img-4.jpeg)

![img-5.jpeg](img-5.jpeg)

![img-6.jpeg](img-6.jpeg)

![img-7.jpeg](img-7.jpeg)

## EXPLANATIONS

ISOBARS are the straight, horizontal lines. The heights in meters of the pressure surfaces in the I.C.A.N. atmosphere are written in brackets ( ) below the pressures on the left hand side of the diagram.

ISOTHERMS are the straight, equidistant lines running diagonally from the left upwards to the right.

DRY-ADIABATICS (i.e. lines of equal potential temperature, or entropy) are the sl…

Form: WRC 9-16

SKEW T, log p - DIA

![img-8.jpeg](img-8.jpeg)