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.

2

-

Cirro Stratus.

3

-

Cirro Culumus.

4

-

False Cirrus.

Medium Cloud:

5

-

-

Thin Alto Stratus

Sun or Moon visible

6

-

Thick Alto Stratus

7

-

Alto Cumulus (low) [below 3 km.].

8

-

Alto Cumulus (high) [above 3 km.]

Code figure.

Metres.

0

equals

cloud

below

150

1

-

cloud

below

150-300

2

-

cloud

below

300-500

4

-

cloud

below

500-750

5

-

cloud

below

1000-1500

6

-

cloud

below

1500-2000

7

-

cloud

below

2000-2500

8

-

cloud

below

2500-3000

9

-

no low cloud.

Code figure

Metres.

1

equals

200

2

-

500

3

-

1000

4

-

1500

5

-

2000

6

-

3000

7

-

4000

8

-

5000

Code figure

0

equals

surface.

1

-

300 metres above surface.

2

-

pressure of 1000 mb.

3

-

pressure of 950 mb.

4

-

pressure of 900 mb.

5

-

pressure of 850 mb.

6

-

pressure of 800 mb.

7

-

pressure of 750mb.

8

-

pressure of 700 mb.

9

-

pressure of 600 mb.

Code figure

Most distant object visible.

Description.

0

less than 25

metres

8 f

50

-

7 f

1

50

-

6 f

100

-

5 f

2

200

-

4 f

500

-

3 f or 1 V

3

1000

-

3 f or 2 V

4

2000

-

2 f or 3 V

5

4000

-

2 f or 4 V

6

7000

-

1 f or 5 V

7

12000

-

1 f or 6 V

8

20000

-

7 V

30000

-

8 V

9

above 30000 and clear air

9 V

Code figure

0

equals

95 - 100

per cent.

9

-

90 - 94

-

8

-

80 - 89

-

7

-

70 - 79

-

6

-

60 - 69

-

5

-

50 - 59

-

4

-

40 - 49

-

3

-

30 - 39

-

2

-

20 - 29

-

1

-

10 - 19

-

Code figure.

Description.

0

equals

Calm-glassy.

1

-

Very smooth-slightly rippled.

2

-

Smooth-rippled.

3

-

Slight-rocks buoy.

4

-

Moderate furrowed.

5

-

Rather rough-much furrowed.

6

-

Rough-deeply furrowed.

7

-

High roller, steep fronts.

8

-

Very high roller, steep fronts.

9

-

Phenomenal-precipitous

Code figure.

0

equals

entirely unfit: fog.

1

-

entirely unfit: rain and low cloud.

2

-

entirely unfit: gales.

3

-

very risky: mist.

4

-

very risky: wind and weather.

5

-

risky: mist.

6

-

risky: wind and weather

7

-

fit.

8

-

very fit.

9

-

perfect

Code figure.

0

equals

entirely unfit: fog.

1

-

entirely unfit: rain, wind and low cloud.

2

-

entirely unfit: gales.

3

-

very risky: high wind.

4

-

very risky: occasional squalls

5

-

risky: strong wind.

6

-

risky: slight squalls.

7

-

fit.

8

very

fit.

9

-

perfect

Code figure.

0

equals

steady.

1

-

- unsteady.

2

-

rising.

3

-

falling.

4

-

falling, then rising.

5

-

steady, then rising.

6

-

steady, then falling.

7

-

falling, now steady.

8

-

rissing, now steady or falling.

9

-

line squall; sudden rise with marked change of wind and weather.