PROJECT BLUE BOOK

.
PROJECT 10073 RECORD CARD
1. DATE 2. LOCATION 12. CONCLUSIONS
0 Wos Balloon
24 June 1957 Villa Grove, Colorado 0 Probably Balloon
.OX Possibly Balloon
3. DATE-TIME GROUP 4. TYPE OF OBSERVATION
Ground-Visuai Ground-Radar 0 Was Aircraft
Local 0 Probably Aircraft
24/2330Z AinVisuoi Air-Intercept Radar D Possibly Aircrait
GMT_
5. PHOTOS 8. SOURCE 0 Was Astronomical
Yes 00 Probably Astronomical
X0 No Civilian Possibly Astronomical
A0No
7. LENGTH 7. LENGTH OF OBSERVATION OF OBSERVATION 8. OBJECTS 9. COURSE COURSE Other. Other
000 000 Insufficient Data for Insufficient Data for Evaluation
Unknown Unknown
2 hours 2 hours one one 315 dgr
10. BRIEF SUMMARY OF SIGHTING 11. COMMENTS
Object round at Object round at bottom, star bottom, star shaped shaped Balloon observation.
on top;size of volley ball, on top;size of volley ball, color
bright Gold. Object drifted behind
mountains. Straight flight, no man-
euvers. euvers.
ATIC FORM
.
E

22 inteval ofC ndr agyad fro rgt tTheDy b
for the overinp portion of the pressure range are hiied with thsty vaises (Wee belew.)
15.5 1-51 SATURATION ADIABATS are the curved green ines that atersent the J%e d is0
bar at intervals of 2"C, diverging upward and tending to decime garatet to the dry
170 50 adiabats.
85 90 [30] SATURATION MEXING RAT10 (in gm. per kg) is represented by dosted gree Gnes.
15.0 49 Their values appear between the 1050 and 1000 mb. lines.
26 27 28 THICkNteSS (in hundreds of geepotential feet and meters) of tsy lepers 1000 700.
1000500.700500, 500-300, 300:200, 200150, 150100, 100 50,45975is 1+p
48 sented by numbers and a graduation along the middie of each layer. The thicknesses
14.5 are obtained from the virtual temperature curve by the equal ares method, ssing any
47 straight line as a drviding line.
160 HEIGht in geopotential fect or meters above mean sea lerel, of stasies derel. of
150 155 160 the 10o0 mb. surface is obtained from the nomogram in the upper left hand corser by
14.0+ 46 rawing a straight line from the temperature scale (F) or (C) through the goint.
45 46 47 18 49
(mean sea level or slation pressure) on the pressure scale, and reading hright en the
45 apprepriate height scale.
150-
13.5 ICAO STANDARD ATMOSPHERE SOUNDING is indicated by a thIck brons lie
44 The saturated adiabats and isnpleths of saturation mixing ratie are computed by
150
[10] use of vapar pressure over a plane wnter surface a all temperatures.
43 Extension of chart to 25 mb. has been accomplished by everiap with presqure ads
130 13 din brackets [100 t 400 m and 25] at 100 b. Dry adiabats for the everap cated in brackets [100] at 400 mb, and [25] at 100 mb. Dry adiabats for the evertap
65 are labeled in parentheses( ). are labeled in parentheses( ).
42
20 APPROXIMATE VIRTUAL TEMPERATURE may be obtained from the formula I, 1 APPROXIMATE VIRTUAL TEMPERATURE may be obtained from the formula T, · T
21 where Ty is virtual temperature in "C, I is free air temperature in "C, and w is miaing
12.5+ 41 ratio in grams/kilogram. For purposes of thickness computation, use the mean tem satio in grams/kifogram. For purposes of thickness computation, use the mean tem-
140 peratwre of the layer for I and use the mean mixing ratio of the layer for w. peentwre of the layer for I and use the mean mixing ratio of the layer for w.
31 40 Blark dots along wind scale line indicate the levels for which wind date is reported Black dots along wind scale line indicate the levels for which wind date is reported
and plottrd. The apen circles O indicate the mandalory pressure levels at which wind and plottrd. The apen circles O indicate the mandatory pressure levels at which wind
12.0 data is also entered.
200 200 39
ALL heights used in this diagram are in geopotential feel and meters.
[50]
38
11.5
130
-37
11.0- -36
SKEW T -LOG P AMALYSIS
95 100 [60] -35
44 10.5 TIME
29 30 120 BEET
250 34 AIRMASS ANALYSIS
0 OE TYPE
H 33 S BOUNDARY- FT.
10.0 0 TYPE
ROUNDARY
32 TYPE
16567 170 [70] 60
INSSNONO FREEZING
50 51 52 9.5 LEVELIS)
11o 31 INVERSIONS
300 11 FRONTAL
-30 RADIATION
9.0 SUGSIDENCE
29 THOPOPAUSE

9pOFt.7 D-UFOB-1-57
USAF SKEW T, log p DIAG
Form: AWS WPC 9.16
TEMPERATURE IN DEGREES FAHRENHEIT AND CELS
120*110°100°90° 80° 70° 60° 50° 40° 20* 10* 0. -10° -20* -30* -40
O
208 45°40*35*30* 25* 20* 15° 10* 5* 0* -5° -10- -15* 1020 -25° -30* -35 -40*
6 00 1 so C6 35 83 100 o 40
O 80 75
100 995+1005 28 100
15160
EEET
200 990F1010 a5
985- 1015
300
30 70 75 80
150/100
980 1020 21 22 23 24 25
400 400 6
975 1025 1025
500 120 125 130 135 140 a
50/2511 4
-1030 1030 37 39 40 41 12 43 44
970 46670
600 150 150 150
*647 54 11608 13608 65
-1035
965 80
700
-1040 60
960 55 60
800 16 17 18
1045 55
955
-900
(q oot ueu) ssa) d aunssad eu) 1050 85
40730
950 200
0 -1000
1055 65
945
-1100 1060
50 040

50 EEEE
990-1010 100 85
200
985- -1015
300
100 0 70 75 80
150/100
980 1020 21 22 23 24 25
400 75
975 + 1025
150 -500 120 125 130 135 140
50/2521
+ 1030 37 39 40 41 42 43
970 46670
-600 150 150
34647 13608
200 1035
965
700
-1040 1040 60 60
960 55 80
800 800 200/150
250 16 18
(qw 00ot uey ssa) d 1045 55
955 955
900
1050 85
40730 40730 6 26 26
950 [50] 50 -200 200 200
300 -1000 1675031 1300671111784
1055 65
-45
945 + 80
-1100 1060
60
350 940
-1200 [60] 80 85 90
3597300/200
-250 24 25 26 27 250
935 (31999)(10161
-1300 5
400
930
-1400 135 140 145 150 155
100/501Lil4
42 6 44 45 46 48
450 925 3,900
-1500

3.2%
55
350 350
1700 (26631)[8117]
[90]
-1800 165 110 115 120
550
[100] 460 23036 33 34 35 36 37
5a0031 400
-1900 (14180) 2
C o
600
2000 7450
20812: [6344] 450
55
2100
650 -10 19480
-500
(132891[5574) (18289:[5574] 500
2200 2200 50
12 8 25
550
1159621 (4865 14865 550 550
700 2300 20
45
75 80 85 85
700/5001id7,4+1+1414 7001/5001idp+1
600 23 24
(13801(4206) [4706) 25 25 600 28 26
40
20
650 650 10
11/901 [1591]
1n
10510 155 to
160 165 170 175
1000/500 141 144 180
17 48 19 50 51 52 53
54 55
750
25
800
5030 M3G0
80 85 90
1000/700 h
850 24 25 26
27 28

-1800 509/300 35
550 L3 33
100 400
1053 .234741[7185)
1900 (istso] 40
600 450
2000 450 35
(70812)_[6344]
55
2100 19480 500
T0 500
650 +18289[55)4]
2200 12 A
10 550
550. 20
1159621 [4865]
700L 2300 45 80 85
700/50001ud4+1+1.1 75
25 6 26
-600 23 24
(13801:[4206] (13801: [4206].
40
650 10
20 20
650
(11780[aso1 (11780[as01] 1n 13
35 3
170 175 175 190 180
10510 155 160 165 144/7441d4
30 700 1000/500 1000/500 8 52 52 53 54 55
47 47 48 19 49 2 o 50 si s1
750 750
750
25
m+560
800 85 O 90
6394 5030 80
itti 28 850
1000/7001 26 27
850 24 25 15
900
900
1241 1A 950,
959
0/14 1000
330
-1000
20 25 30 35 40 45 50
105077/ 11 010207222111 -25 -20 -15 -10 o 5 10 15
-45 -40 -35 -30 FAHRENHEIT TEMPERATURE SCALE
LCTA AEXONAGUCAL CHAR AND PNTORMATION CENTER,

B. VOLLEY BALL
C. -BRIGHT T GOLD
D. ONE
E. NEGATIVE
F. NEGATIVE the C
G. NEGATIVE
H. NEGATIVE
I. NEGATIVE ..
C
e
RAGE TWO RJEDEN 116
2. A. SIGHTER CEJECT FROM HIGHWAY
B. APPROXIMATELY 60 DEGREES ELEEATION DASH 315 DEGREES AXIMUTH
C. APPROXIMATELY 40 DEGREES ELEVATION DASH 315 DEGREES AZIMUTH DEGREES AZIMUTH
D. STRAIGHT FLIGHT DASH PATH DASH H NO MANEUVERS H NO MANEUVERS
E. DRIFTET IEHIND MOUNTAINS
F. APPROXIMATELY TWO PAREN 2 PAREN HOURS HOURS
3. A. 24/2330 Z A. 24/2330 Z
E. DAY
5 VILLA GROVE CMM COLORADO
6. CIVILIAN
SuoNor"CMN VILLA GROVE CMM COLORADO
7. A. CLEAR
I. NEGATIVE
C. UNLIMITED
D.L UNLINITED
-

FNONE .. 0
.NEGATIBE
NEGATIVE
1NEGATIVE .
:
3 *
.
.
.
.
PAGE THREE RJEDEN 116 •
11. CAPTAIN EUGENE MAXWELL CMM INTELLIGENCE OFFICER POSSIBLY
A WEATHER BALLON PD END .
1
:
25/30+7Z-1UN 25/30 472-) UN RJEDEN RJEDEN -
1.
•
. .
.
.
.
•

S
D
6
240657-02
listuers
02 2508 22 01a 4≤4 (
26Jun57 10
-4X2
MPHD13V WPCUE_YMB126ENA1Z7
RJED AJEPHO RJWFDN -
RJEDEN 116
251355Z
COMLR -SD2 AISS ENT AFE COLO
ZEN/COHADC ENT AFB COLO
ADH/CONDR 34TH AD KIRTLAND AFE NMEX

Repurt # D1-UrUD-1-D7
1ol o2 WHEN FILLED IN
Title: ,Cverlay showing aircraft plotted by-"Overlayy on the night of 23 June 57
DARA 4 JIAA 1957 IITIAL 3
FICHTERS
TRACK NO UNKNOWN 3
I.D.
XN IN NM PN ON AN EN CN
KM IM MM NM PM OM AM EM CM
KL IL ML ML PL OL AL BL CL
-541
I.n57
C4 57
210√G VoTh
EX OX
7
KJ LJ MJ NJ S AJ BJ CJ
Bigwhe icwhe
0733324J0 0733
VE PH OH OR BE BE CE
KG IG IMG NG QG CG
AireffT pierd up ok sor OMAY
004ONT
LF MT NF PF AF BF C3
QAMESESUNrIAN
CAPT, piiectine chet
ERAF15 2L
1E LE ME NE PE A BZ C3
WHIOE LIED IN ATSS CLAS

eport #Dl-UFOB-1-57
Incl #3
Title: Sketch showing positions and tracks"of Planets Jupiter ahd Saturn on the night of 23 June as drawn by
Captain James E. Sullivan Direction Center Chdef, 668th AC&w, Mather AFB, Calif., Senior Navigator.
90°
Zenith
1
°00 200
30°
| |
225 270
SW W 315
NW 0
180
S = OZ
135
SE NE
$9\frac}$
1he/73

8.5- 28
L.F.C.
100 SIGNIFICANT WIND
-27
350 MAX.
8.0- MIN.
[e0] 26 LEVELS OF SHEAR
STABILITY
-25 INDEX INDEX
5 130 135 7.5 TO TO
uyohha
39 40 8 24 TO TO
400 TO TO
1001 7.0+23 CLOUDS
TYPE
AMOUNT
22 BASES
6.5 TOPS
450 21 ICING
TYPE
-20 SEVERITY
6.0 BOUNDARIES
-19 CONTRAILS
500 PERSISTENCE
5.5+-18 HEIGHT
TURBULENCE
1-17 DEGREE
5.0 HEIGHT(S)
550 -16 MAX WIND GUSTS
HAIL SIZE
S -15 TEMPERATURES
4.5 MAX.
90
y hlplf -14 MIN.
28 CUMULUS CLOUD FORMATION AT TEMP
TIME
4.0--13
DISSIPATION OF LOW LEVEL INVERSION AT TIME
650 112
3.5 REMARKS
-11
2. 200
185 :190 195 700- 3.0 -10
56 57 58 2 59 60 25 9 FORECASTER FORECASTER
750 2.5
493 OAK
5 -7 00002 +7
800 2.0 6604 SONS7
105 TH15 ThUE
100
fi 1.5- 5 Of 6no6 Fin 24 Ju0es7
30 31 32 850
4

TO TO
TO TO
[100] CLOUDS
7.0-23
TYFE
+-22 AMOUNT
BASES
6.5 TOP5
450 21
ICING
TYPE
+20 SEVERITY
6.0 BOUNDARIES
CONTRAILS
500 PERSISTENCE
5.5+18 HEIGHT
TURBULENCE
-17 DEGREE
HEIGHT(3)
550 16 MAX WIND GUSTS
HAIL SIZE
S -15 TEMPERATURES
90 95 4.5 MAX.
-14 MIN.
27 28 29
CUMULUS CLOUD FORMATION AT TEMP TIME
4.0-13
DISSIPATION OF LOW LEVEL INVERSION AT DISSIPATION OF LOW LEVEL INVERSION AT TIME TIME
650 650 -12
3.5 3.5- REMARKS
-11
185 190 195 200 3.0 3.0 -10 -10
hwl
57 57 58 58 59 60 25 -9 FORECASTER
750 750 2.5 -8 8
00 493 OAK
00002 +7
800 2.0 924JON57
6 THIS TRUE
100 105
1114112111 A5 5 OF RAOB FOM 24 JUNESY
30 31 32 850 1.5
4 LAUAOHED FBON OAKLAND
000 1.0
CALiP AND PLoTTeD B
950 0.5 BNUMBER WEATHESTATIONSHAHON
8 -1
MT Me CHEshAN AFB
D00
-o
TIME (GCT) DATE (GCT)
65 70 75 80 85 90 95 100 105 110 115 Wber B SEKENsEN
This diagram replaces AWS WRC a.16 Form: AWS WPC 9.16
corrections and additions to this diagram widt be
direCt to HEADQUARTERS AIR WEATHER SERVICE
Wadhogn 25 D C

AM
-50- -60
EXPLANATION
-45* 150 -50°
60 (357.8) 160 ISOBARS are straight. horizontal brown lines. The heights of the pressure surfaces
53 O -45 in the ICAo Standard atmosphere, below the pressure values on the left, are in paren.
-40 theses( ) for values in feet and brackets[ ] for meter values.
100 -7
[251 9 1SOTHERMS (°C) are the straight. equidistant brown lines running diagonally up-
53
ward from left to right.
32 DRY ADiABATS are the slightly curved brown lines that intersect the 1000 mb. iso-
bar at intervals of 2'C, and run diagonally upward from right to left. The Dry Adiabats
for the overlap portion of the pressure range are labeled with two(2) values. (See below.)
51 SATURATION ADIABATS are the curved green lines that intersect the LOO0 mb. iso-
bar at intervals of 2"C. diverging upward and tending to become paraltel to the dry
85 170 50 adiabats.
90 187.2 5
$uyfx/jmyegp. [30] SATURATION MixiNG RATIO (in gm. per kg.) is represented by dashed green lines.
26 27 150 49 Their values appear between the 1050 and 1000 mb. lines.
28
THICkNess (in hundreds of geopotential feet and melers) of the jayers 10on 700.
1000·500. 700.500. 500300, 300·200, 200-150, 150·100: 100-50, and 50 25 mb. is repre-
48 sented by numbers and a graduation along the middle of each layer. The thicknesses
145 are obtained from the virtual temperature curve by the equal area method, using any
150 160 47 straight line as a dividing line.
+ 155 160 (372.5 HElGht in geopotential feet or meters above mean sea level, or station level, of
45 46 47 the loo0 mb. surface is obtained from the nomogram in the upper left-hand corner by
48 49 140-46 drawing a straight line from the temperature scale (°F) or (C) through the point p,
(mean sea level or station pressure) on the pressure scale, and reading height on the
150 45 appropriate height scale.
13.5 ICAO STANDARD ATMOSPHERE SOUNDING is indicated by a thick brown line.
150 44 The saturated adiabats and isopleths of saturation mixing ratio are computed by
[40] use of vaper pressure over a plane water surface at all temperatures.
+43 Extension of chart to 25 mb. has been accomplished by overlap with pressure indi-
65 13.0 cated in brackels [100] at 400 mb, and [25] at 100 mb. Dry adiabats for the overlap
if are labeled in parentheses( ).
20 42 W
21 APPROXIMATE VIRTUAL TEMPERATURE may be oblained from the formula Ty = I 6
where Ty is virtual temperature in "C, T is free air temperature in C, and w is mixing
140 12.5 41 ratio in grams/kilogram. For purposes of thickness computation, use the mean tem-
343.1) perature of the fayer for T and use the mean mixing ratio of the layer for w.
- 40 Black dots • afong wind scale line indicate the levels for which wind data is reported
and plotted. The apen circles O indicate the mandatory pressure levels at which wind
12.0 data is also entered
200 39
[50] Ali. heights used in this diagram are in geopotential feet and meters.
i +38
130 11.5-
-37
RLLE
11.0-36
SKEYT.LOGPANALYSIS
S
i T18