518
Table IX.
In 2 hours.
In 3 hours.
In 4 hours.
Code Figure.
Barometer steady-Has not risen
or fallen more than
0.3 mb. (.01 in)
0.5 mb.
(.01 in)
0.7 mb. (.02 in)
0
Barometer rising slowly-Has
risen
0.7-1.0 mb.
1.0-1.5 mb.
1.3-2.0 mb.
1
(.02-.03 in)
(.03-.05 in)
(.04-.06 in)
Barometer rising-Has risen
1.4-2.4 mb. (.05-.07 in)
2.0-3.5 mb. (.06-.10 in)
2.8-4.8 mb.
2
(.08-.14 in)
Barometer rising quickly-Has
risen
2.6-4.0 mb. (.08-.12 in)
4.0-6.0 mb. (.12-.18 in)
5.2-8.0 mb. (.15-.24 in)
3
Barometer rising very rapidly —
Has risen
Barometer falling slowly-Has
fallen
Barometer falling - Has fallen
over 4.0 mb.
over 6.0 mb.
over 8.0 mb.
1
(,, .12 in)
|
(,, .18 in)
(,, .24 in)
0.7-1.0 mb. (.02-.03 in)
1.0-1.5 mb. (03-.05 in)
1.3-2.0 mb.
5
(.04-.06 in)
1.4-2.4 mb. (.05-.07 in)
2.0-3.5 mb. (.06-.10 in)
2.8-4.8 mb.
6
(.08-.14 in)
Barometer falling quickly-Has
fallen
2.6-4.0 mb. (08-.12 in)
4.0-6.0 mb. (12-.18 in)
5.2-8.0 mb. (.15-.24 in)
7
Barometer falling very rapidly—
Has fallen
over 4.0 mb.
(,, .12 in)
(„,
over 6.0 mb. .18 in)
(,,
over 8.0 mb. .24 in)
00
8
(The change in 3 hours should be given if possible).
Table XII,
Dense fog Thick fog
Fog
4.
...
Moderate fog
Mist or haze, or very
poor visibility
Poor visibility
Moderate visibility
Good visibility
Very good visibility
...
Excellent visibility
Objects visible at 27 yards Objects visible at 55 yards. Objects visible at 1 cable Objects visible at 2 cables
Objects visible at Objects visible at Objects visible at
mile (nautical) 1 mile (nautical) 2 miles (nautical)
Objects visible at 5 miles (nautical)
Code Figure.
0
1
...
Objects visible at 10 miles (nautical) Objects visible more than 30 miles (nautical)
1
4
6
(Further information concerning the code may be found in the "Marine Observer" for January, 1934, and subsequent issues, obtainable from the Meteorological Office, London).
15th May, 1936.
C. W. JEFFRIES,
Director.