Archive Index

Reconstruction


Meteorological Data

Refer to map of weather stations in SE England

1) UK Meteorological Office Daily Weather report
2) Met Office Daily Aerological Record
3) Met Office Isobar and Winds Charts
4) Bentwaters USAF Weather Report
5) Lakenheath USAF Weather Report

(Radar refractivity N-profiles and analysis are presented here)


1) Met. Office Daily Weather Report

1800Z August 13

Felixstowe (elevation 16')

Gorleston (elevation 26')

Mildenhall (elevation 39')

W.Raynham (elevation 263')

Wittering
(elevation 219')

Total cloud

5/8

7/8

5/8

3/8

2/8

Wind direct.

270 (true)

258

247

247

258

Wind speed

20 knots

11 knots

12 knots

14 knots

17 knots

Visibility

25 miles

7.5 miles

21 miles

34 miles

25 miles

Weather since noon

cloud covering more than of the sky throughout

cloud covering more than of the sky throughout

rain

cloud covering > of sky during part of period and < during part of period

cloud covering more than of the sky throughout

Present weather

clouds generally dissolving or becoming less developed during past hour

state of sky on the whole unchanged during past hour

clouds generally dissolving or becoming less developed during past hour

clouds generally dissolving or becoming less developed during past hour

clouds generally dissolving or becoming less developed during past hour

Low cloud

cumulus
2800'

stratocumulus layer 2100'

stratocumulus 3000'

cumulus
4000'

stratocumulus
/cumulus 4000'

Higher cloud

altostratus
10,000'

cirrus
25,000'

cirrus
25,000'

cirrus
25,000'

-

Dry bulb temp.

(+65F)
+18.3C

(65F)
18.3C

(63F)
17.2C

(61F)
16.1C

(62F)
16.7C

Dewpoint temp.

(+53F)
+11.6C

(50F)
10C

(47F)
8.3C

(45F)
7.2C

(44F)
6.7C

Last 3 figures of pressure (reduced to MSL) in mb & 1/10 mb

041

029

037

022

030

Characteristic of barometric tendency

increasing (steadily or unsteadily)

increasing (steadily or unsteadily)

increasing (steadily or unsteadily)

increasing (steadily or unsteadily)

increasing (steadily or unsteadily)

Change of pressure in last 3 hours, 1/10 mb

+21

+19

+18

+14

+13

Ground condition 2100Z

moist

moist

moist

dry

dry

Reports from surface met. stations at Felixstowe, Gorleston, Mildenhall, West Raynham and Wittering for 1800Z August 13 1956

 

  0000Z August 14

Felixstowe (elevation 16')

Gorleston (elevation 26')

Mildenhall (elevation 39')

W.Raynham
(elevation 263')

Wittering (elevation 219')

Total cloud

nil

nil

nil 

nil 

nil 

Wind
direct.

220

 247

225

 236

247

Wind
speed

10 knots 

10 knots

10 knots

20 knots

14 knots

Visibility

12.5 miles

8.75 miles

18.25 miles

34 miles

18.25 miles

Weather since 1800Z

cloud covering or less of the sky throughout the period

cloud covering or less of the sky throughout the period

cloud covering or less of the sky throughout the period

cloud covering or less of the sky throughout the period

cloud covering or less of the sky throughout the period

Present weather

 state of sky on the whole unchanged during past hour

clouds generally dissolving or becoming less developed during past hour

state of sky on the whole unchanged during past hour

state of sky on the whole unchanged during past hour

state of sky on the whole unchanged during past hour

Low cloud

 nil

nil

nil

nil

nil

Higher cloud

nil

nil

nil

nil

nil

Dry bulb temp

(+55F)
+12.7C

(56F)
13.3C

 (54F)
12.2C

 (51F)
10.5C

(53F)
11.7C

Dewpoint temp.

(+52F)
+11.1C

(44F)
6.7C

(48F)
8.9C

(45F)
7.2C

(47F)
8.3C

Last 3 figures of pressure (reduced to MSL) in mb & 1/10 mb

067

057

058

044

050

Characteristic of barometric tendency

increasing (steadily or unsteadily)

increasing, then steady; or increasing, then incr. more slowly

increasing (steadily or unsteadily)

increasing (steadily or unsteadily)

increasing (steadily or unsteadily)

Change of pressure in last 3 hours, 1/10 mb

+09

+03

+09

+06

+07

Ground condition 0900Z

dry

 dry

dry

 dry

 dry

Reports from surface met. stations at Felixstowe, Gorleston, Mildenhall, West Raynham and Wittering for 0000Z August 14 1956

(Data extracted from Met.Office Daily Weather Reports for 13:1800Z and 14:0000Z supplied by Paul Fuller.)


2) Met. Office Daily Aerological Record

Radar and radiosonde upper air soundings at Hemsby, Norfolk, 1402Z August 13 & 0201Z August 14 1956 .

Hemsby 13:1402Z

Hemsby 14:0201Z

Pressure, mb: MSL 999.8; surface 998.3; freezing 670
Tropopause: 10,850 m (235 mb, -54C)

Pressure, mb: MSL 1005.0; surface 1003.5; freezing 800
Tropopause: 14,230 m (141 mb, -50C)

pressure (mb)

height (g.meters)

Temp.
(C)

Dewpoint
(C)

pressure (mb)

height (g.meters)

Temp.
(C)

Dewpoint
(C)

surface

12

18

15

surface

12

11

08

1000

-001

-

-

1000

41

11

08

-

-

-

-

972

-

11

07

936

-

13

09

-

-

-

-

-

-

-

-

900

-

07

01

892

-

10

09

-

-

-

-

850

1361

08

04

850

1385

03

-02

-

-

-

-

826

-

-

-01

-

-

-

-

813

-

01

-03

807

-

-

-11

-

-

-

-

-

-

-

-

751

-

-02

-11

-

-

-

-

737

-

-02

-14

-

-

-

-

730

-

-

-17

700

2944

02

-23

700

2935

-04

-20

660

-

-01

-27

-

-

-

-

633

-

-01

-27

-

-

-

-

-

-

-

-

622

-

-09

-28

-

-

-

-

577

-

-11

-33

570

-

-06

-32

-

-

-

-

500

5585

-15

-38

500

5521

-18

-37

400

7229

-29

-41

400

7154

-29

-48

380

-

-29

-38

-

-

-

-

355

-

-31

-37

-

-

-

-

300

9247

-42

-

300

9156

-42

-

267

 

-49

-

267

-

-47

-

-

-

-

-

247

-

-45

-

235

-

-54

-

-

-

-

-

-

-

-

-

227

-

-41

-

220

-

-50

-

-

-

-

-

206

-

-50

-

-

-

-

-

200

11,908

-49

-

200

11,884

-41

-

194

-

-48

-

-

-

-

-

-

-

-

-

192

-

-41

-

-

-

-

-

160

-

-46

-

150

13,794

-51

-

150

13,811

-48

-

149

-

-51

-

-

-

-

-

-

-

-

-

141

-

-50

-

138

-

-49

-

-

-

-

-

-

-

-

-

130

-

-40

-

-

-

-

-

112

-

-52

-

105

-

-53

-

-

-

-

-

100

16,429

-51

-

100

16,460

-49

-

095

-

-49

-

-

-

-

-

-

-

-

-

091

-

-47

-

087

-

-49

-

-

-

-

-

080

-

-48

-

080

-

-49

-

-

-

-

-

075

-

-47

-

070

-

-50

-

-

-

-

-

061

-

-49

-

-

-

-

-

-

-

-

-

060

-

-49

-

055

-

-49

-

-

-

-

-

Temperature, pressure and humidity

(Data extracted from Met.Office Daily Aerological Records for 13:1402Z and 14:0201Z supplied by Paul Fuller. Reduced and graphed in Analysis of Met. Office Weather Reports & Radiosonde Data.)

 

 

13:1402Z

13:2000Z

14:0201Z

14:0800Z

 

Temp

Pilar

Temp

Pilar

Alt.
(meters)

Pressure
(mbar)

Dir.
(deg.)

Vel. (knot.)

Dir.
(deg.)

Vel. (knot.)

Dir.
(deg.)

Vel. (knot.)

Dir.
(deg.)

Vel. (knot.)

surface

-

230

17

210

10

 240

09

250

20

900

-

250

33

260

30

 270

36

280

40

1500

850

240

34

270

28

270

34

290

 39

2100

750

250

42

260

30

260

44

280

40

3000

700

250

47

 260

42

260

50

280

37

4200

600

250

50

250

56

260

61

270

44

5400

500

250

59

250

62

 250

71

270

66

7200

400

250

61

250

70

 260

98

270

98

9000

300

250

67

 250

83

260

 109

260

99

10500

250

250

70

 260

92

260

 102

260

88

12000

200

260

75

260

74

260

70

 270

59

14100

150

270

50

260

39

 260

46

 250

44

15900

100

250

30

 270

38

-

-

 260

35

18000

75

270

18

250

20

-

-

 240

 19

20400

50

280

08

 230

06

-

 -

 -

-

22800

35

 -

-

 260

56

-

 -

 -

 -

(Note: Pilar reports relate to heights measured by radar; Temp reports relate to corresponding radiosonde measurements of pressure. All speeds are measured by radar.)

Upper winds

(Data extracted from Met.Office Daily Aerological Records for 13:1402/2000Z and 14:0201/0800Z supplied by Paul Fuller.)


3) Met Office isobar and winds charts

Isobar and winds chart for 0600Z (GMT) August 13th 1956

Isobar and winds chart for 1800Z (GMT) August 13th and 0000Z August 14th 1956

Isobar and winds chart for 0600Z (GMT) August 14th 1956

General Synoptic Development & Forecast, mid-day Monday 13th August 1956

General Synoptic Development & Forecast, mid-day Monday 14th August 1956


Crown copyright, Met Office. Reproduced under Licence Number MetO/IPR/2/2002 0050
By granting this licence the Meteorological Office does not endorse the use made of the information or any any conclusions that may be drawn from it.


4) Bentwaters USAF weather report (extract from Air Intelligence Information Report IR-1-56)

Weather report from the Bentwaters weather detachment for the period 2100Z to 2200Z, 13 August 1956 for the Bentwaters area follows:

Winds:
Surface - Direction 230 velocity 5 - 10 knots
6000 ft - Direction 260 velocity 30 knots
10,000 ft - Direction 260 velocity 40 knots
16,000 ft - Direction 260 velocity 55 knots
20,000 ft - Direction 260 velocity 70 knots
30,000 ft - Direction 260 velocity 90 knots
50,000 ft - Direction 260 velocity 40 knots

ceiling: 25,000 ft
Visibility: 9 miles

No thunderstorms were located in the area of the sightings.


5) Lakenheath USAF weather report (extract from AFR 200-2 intelligence report BOI-485)

a) [Observer(s) account of weather conditions]

Clear sky until 0300Z shortly thereafter scattered clouds at 3500 ft.

[Report from nearest AWS or U.S. Weather Bureau Office of wind direction and velocity in degrees and knots at surface, 6,000', 10,000', 16,000', 20,000', 30,000', 50,000', and 80,000', if available]

From midnight until 0600Z

surface wind was 230 deg at 15 knots;
6000 ft 290 deg at 24 knots;
10000 ft 290 deg at 35 knots;
16000 ft 290 deg at 45 knots;
20000 ft 290 deg at 53 knots;
30,000 ft 290 deg at 62 knots;
50,000 ft 290 deg at 75 knots.

c) Ceiling unlimited.

d) Visibility from 0001Z to 0400Z was 10 nautical miles.

e) 1/10 of sky covered at 0300Z.

[Thunderstorms in area and quadrant in which located]

Negative.


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Reconstruction