Notation	Name	Description	Status
0	Nil		stable
1	Light		stable
2	Moderate		stable
3	Severe		stable
4	Nil		stable
5	Light		stable
6	Moderate		stable
7	Severe		stable
8	Nil		stable
9	Light		stable
10	Moderate		stable
11	Severe		stable
12	Extreme, in clear air		stable
13	Extreme, in cloud		stable
14	Extreme, cloud/clear air not specified		stable
15	Missing value		stable