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	Light, isolated moderate		stable
16	Light, occasional moderate		stable
17	Light, frequently moderate		stable
18	Moderate, isolated severe		stable
19	Moderate, occasional severe		stable
20	Moderate, frequently severe		stable
21	Severe, isolated extreme		stable
22	Severe, occasional extreme		stable
23	Severe, frequently extreme		stable
63	Missing value		stable