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Abbreviations and codes used in the observer's diary

Table 4: Code for observing and reporting visibility (download PDF version)

CODE General DescriptionVisibility Range
(inclusive)
Standard Distance
yards metres yards metres
X DENSE FOG 0 - 24 0 - 19
E 25 - 44 20 - 39 22 20
0 THICK FOG 45 - 104 40 - 99 44 40
1 105 - 210 100 - 199 110 100
2 FOG 220 - 430 200 - 399 220 200
3 MODERATE FOG 440 - 1090 400 - 999 440 400
FOG LIMIT
4 VERY POOR VISIBILITY 1100 - 2190 1000 - 1999 1100 1000
5 POOR VISIBILITY 2200 - 4390 2000 - 3999 2200 2000
miles km miles km
6MODERATE VISIBILITY 4
3 - 6 4 - 9 4⅓ 7
7 GOOD VISIBILITY 7 - 12 10 - 19 10
8 VERY GOOD VISIBILITY 12½ 20
13 - 24 20 - 39 18⅔ 30
9 EXCELLENT VISIBILITY 25 or over 40 or over 25 40

 

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Last Revised: 2008 July 1st
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