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Precipitation and Squalls of Wind

(59-70)—Continued. Code figure.

67 Heavy rs.
68 Slight s.
69 Moderate s.
70 Heavy s.

Snow Covering.
71 s over whole country.
72 s with bare patches.
73 Deep drifts.
74
75 Reserve figures.
76

Precipitation (77–97).
77 Slight d.
78 Moderate d.
79 Thick d.
80 Slight r.
81 Moderate r.
82 Heavy r.
83 Slight h.
84 Moderate h.
85 Heavy h.
86 Slight rs.
87 Moderate rs.
88 Heavy rs.
89 Slight s.
90 Moderate s.
91 Heavy s.
92 Slight tir
93 Moderate tlr Without hail.
94 Heavy tlr
95 Slight tir
96 Moderate tlr With hail.
97 Heavy tlr
98

serve

Special Phenomena without Precipita

tion—Continued. Code figure.

36 Glazed frost.
37 Glazed roads.
38 Solar halo.
39 Lunar halo.
40 Solar corona.
41 Lunar corona.
42 Aurora,
43 Squalls.
44 Gale.
45 Gloom.
46 Ugly: threatening.
47 Thunder.
48 Lightning.
49 Thunder and lightning.

Precipitation and Fog (50–58).
50 Slight r
51 Moderate r 2f. or 31.
52 Heavy r
53 Slight r
54 Moderate r 4f. or 5f.
55 Heavy r
56 Slight r
57 Moderate r 6f. to 8f.

58 Heavy r
Precipitation and Squalls of Wind

(59-70). 59 Slight r. 60 Moderate r. 61 Heavy r. 62 Slight h. 63 Moderate r and h. 64 Heavy r and h. 65 Slight rs. 66 Moderate rs.

Reserve figures. 99

Code 11.-Past Weather.-WW.

NOTE.-00_49 Weather without precipitation; 50–97 Weather with precipitation.

No Precipitation or Fog (00–14). Code figure.

00 equals Cloudless. 01

b and bc; med. or high

cloud. 02

b and bc; low cloud. 03

b and c; mixed cloud. 04

bc and c; med, or high

cloud. 05

bc and c; low cloud. 06

bc and c; mixed cloud. 07

c and o; med. or high

cloud. 08

C and o; low cloud. 09

C and o; mixed cloud.

Overcast, with Blue Patches (10-12).
Code figure.

10 equals Med. or high cloud.
11

Low cloud. 12

Mixed cloud. 13

Completely overcast;

low or mixed cloud. 14

b and o; low or mixed

cloud. Fog with Cloud above (15-19). 15 equals Overcast and if. 16

Overcast and 28. 17

Overcast and 3f. 18

Overcast and 4f or 5f. 19

Overcast and 6f to 8f.

Code 11.-Past Weather --WW--Continued.

Haze or Fog (20-24). Code figure.

20 equals Haze 1f.
21

Haze 2f.
22

Fog 3f. 23

Fog 4f. or 5f. 24

Fog 6f. to 8f.

Wet Fog or Mist (25–29).

25 equals Mist 1fe. 26

Mist 2fe. 27

Fog 3fe. 28

Fog 4fe. or 5fe. 29

Fog 6fe. to Sfe.

Passing showers (50-61)-Continued.
Code figure.

59 of slight
60 of moderate show.

61 of heavy
Occasional Precipitation (62-76).
62 Occasional slight d.
63

moderate d. 64

thick d. 65

slight r. 66

moderate r. 67

heavy r. 68

slight r and h. 69

moderate r and h. 70

heavy r and h.
71 Occasional slight
72

moderate
73

heavy

and rs. 74

slight s. 75

moderate s. 76

heavy s.

rs or r

Special Phenomena without Precipi

tation (30–49). 30 equals e (wet air). 31

Exceptional visibility. 32

Dust haze. 33

Dew. 34

Hoar frost. 35

Rime. 36

Glazed frost. 37

Glazed roads. 38

Solar halo. 39

Lunar halo. 40

Solar corona. 41

Lunar corona. 42

Aurora. 43

Squalls. 44

Gale. 45

Gloom. 46

Ugly; threatening. 47

Thunder, 48

Lightning. 49

Thunder and lightning.

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Continuous or nearly Continuous Pre

cipitation (77-91).
77 Slight
78 Moderate drizzle.
79 Thick
80 Slight
81 Moderate rain.
82 Heavy
83 Slight
84 Moderater and hail.
85 "Heavy
86 Slight
87 Moderate rs or r and rs.
88 Heavy
89 Slight
90 Moderate snow.
91 Heavy

Thunderstorms (92–97).
92 Slight tlr
93 Moderate tlr without hail.
94 Heavy tir
95 Slight tir
96 Moderate tlr with hail.
97 Heavy tlr
98

PRECIPITATION.

Passing showers (50–61).

50 of slight 51 of moderate rain. 52 of heavy 53 of slight 54 of moderate hail or r and h. 55 of heavy 56 of slight 57 of moderate rs or r and rs. 58 of heavy

99

}Reserve Numbers.

Code III.-Form of Cloud: Low Cloud.-A. Medium or High Cloud.-B.

Code figure.
Low Cloud: 1 equals Fracto-cumulus.

2

Mammato-cumulus. 3

Low Strato-cumulus (below 1200 m.). 4

High Strato-cumulus (above 1200 m.). 5

Nimbus. 6

Cumulus. 7

Cumulo-nimbus. 8

Stratus. High Cloud: 1

Cirrus.

Code III.-Form of Cloud, etc.--Continuel.

Code figure.

2 3

4 Medium Cloud: 5

6 7 8

Cërro-stratus.
Cirro-cumulus.
False Cirrus.
Thin Alto-stratus (Sun or Vocn visible).
Thick Alto-stratus.
Alto-cumulus (low) (below 3 km.).
Alto-cumulus (higli) (about 3 km.).

Code IV (a), (b), (c).-- II cights and Pressures of l'pper lir Reports.

Code IV (6).—Height of Upper

Wind.-H.

Code IV (a).-Height of Base of Low

Cloud.-N. Code figure.

Metres. O equals Cloud below 150 1

Cloud between 150-300 2

Cloud between 300-500 3

Cloud between 500_750

Cloud between 750_1000 5

Cloud between 1000-1500

Cloud between 1500-2003 7

Cloud between 2000-2500 8

Cloud between 2500-3000 9

No low cloud.

Code figure. Metres.

1 equals 200
2

500
3

1000
4

1500
2000

3000
7

4000 8

5000

Code IV (c).--Height or pressure to ulich Temperature and Humidity Valucs

refer.- p.

[blocks in formation]

Code VI.-Relative Humidity.-H.

Code figure.

O equals 95—100 per cent. 9

90 94 8

80- 89 7

70- 79
60-- 69

Code figure.

5 equals 50—59 per cent. 4

40-49 3

30_39 2

204-29 1

10-19

[blocks in formation]

Code IX.-Characteristic of Barometric Tendency.-B.

Code figure.

O equals steady. 1

unsteady. 2

rising. 3

falling.
falling, then rising.
steady, then rising.
steady, then falling.

Code figure.

7 equals falling, now steady. 8

rising, now steady or

falling. 9

line squall; sudden rise

with marked change of wind and weather.

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Code X.-Direction of Wind.-DD.

Direction is specified to the nearest 40 equals SSW. 5° by use of the numbers 1–72. The 45

SW. numbers corresponding with the usual 49

WSW. “even” points of the old telegraphic 54

West. scale are as follows:

58

WNW. 04 equals NNE.

NW. 09 NE

NNW. 13 ENE.

North. 18 East.

To express directions calculated in 22 ESE.

degrees in this scale, divide the num27 SE.

ber of degrees by 5 (or multiply by 2 31 SSE.

and divide by 10). 36

South.
E. 9., 17° equals 03; 53° equals 11 ; 257° equals 51 ; 313° equals 63.

ANNEX (H).

CUSTOMS.

GENERAL PROVISIONS.

1.

Any aircraft going abroad shall depart only from aerodromes specially designated by the Customs Administration of each contracting State, and named "customs aerodromes."

Aircraft coming from abroad shall land only in such aerodromes.

2.

Every aircraft which passes from one State into another is obliged to cross the frontier between certain points fixed by the contracting States.

. nese points are shown on the aeronautical maps.

3.

All necessary information concerning customs aerodromes within a State, including any alterations made to the list and any corresponding alterations necessary on the aeronautical maps and the lates when such alterations become valid, and all other information concerning any international aerodromes which may be established, shall be communicated by the State concerned to the International Commission for Air Navigation, which shall notify such information to all of the contracting States. The contracting States may agree to establish international aerodromes at which there may be joint customs services for two or more States.

4.

When, by reason of a case of force majeure, which must be duly justified, an aircraft crosses the frontier at any other point than those designated, it shall land at the nearest customs aerodrome on its route. If it is forced to land before reaching this aerodrome it shall inform the nearest police or customs authorities.

It will only be permitted to leave again with the authorisation of these authorities, who shall, after verification, stamp the log book and the manifest provided for in paragraph 5: they shall inform the pilot of the customs aerodrome where he must necessarily carry out the formalities of customs clearance.

5.

Before departure, or immediately after arrival, according to whether they are going to or coming back from a foreign country, pilots shall show their log books to the authorities of the aerodrome

29479_S. Doc. 348, 67-4

81

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