The Turner stability class or Turner stability index is a classification of atmospheric stability over an interval of time based on measurements of surface-level wind speed and net solar radiation. Classes range from 1 (most unstable) to 7 (most stable). The Turner stability class system was devised by D. B. Turner as a modification of the Pasquill stability class system. [1]
The following table is used to determine the Turner stability class for a given wind speed and net solar radiation:
Wind speed (knots) |
Net radiation index | ||||||
---|---|---|---|---|---|---|---|
4 | 3 | 2 | 1 | 0 | -1 | -2 | |
0, 1 | 1 | 1 | 2 | 3 | 4 | 6 | 7 |
2, 3 | 1 | 2 | 2 | 3 | 4 | 6 | 7 |
4, 5 | 1 | 2 | 3 | 4 | 4 | 5 | 6 |
6 | 2 | 2 | 3 | 4 | 4 | 5 | 6 |
7 | 2 | 2 | 3 | 4 | 4 | 4 | 5 |
8, 9 | 2 | 3 | 3 | 4 | 4 | 4 | 5 |
10 | 3 | 3 | 4 | 4 | 4 | 4 | 5 |
11 | 3 | 3 | 4 | 4 | 4 | 4 | 4 |
≥ 12 | 3 | 4 | 4 | 4 | 4 | 4 | 4 |
The net radiation index is determined by following a procedure (see flowchart) that takes into account the cloud cover, ceiling height, and solar altitude.
The Turner stability class or Turner stability index is a classification of atmospheric stability over an interval of time based on measurements of surface-level wind speed and net solar radiation. Classes range from 1 (most unstable) to 7 (most stable). The Turner stability class system was devised by D. B. Turner as a modification of the Pasquill stability class system. [1]
The following table is used to determine the Turner stability class for a given wind speed and net solar radiation:
Wind speed (knots) |
Net radiation index | ||||||
---|---|---|---|---|---|---|---|
4 | 3 | 2 | 1 | 0 | -1 | -2 | |
0, 1 | 1 | 1 | 2 | 3 | 4 | 6 | 7 |
2, 3 | 1 | 2 | 2 | 3 | 4 | 6 | 7 |
4, 5 | 1 | 2 | 3 | 4 | 4 | 5 | 6 |
6 | 2 | 2 | 3 | 4 | 4 | 5 | 6 |
7 | 2 | 2 | 3 | 4 | 4 | 4 | 5 |
8, 9 | 2 | 3 | 3 | 4 | 4 | 4 | 5 |
10 | 3 | 3 | 4 | 4 | 4 | 4 | 5 |
11 | 3 | 3 | 4 | 4 | 4 | 4 | 4 |
≥ 12 | 3 | 4 | 4 | 4 | 4 | 4 | 4 |
The net radiation index is determined by following a procedure (see flowchart) that takes into account the cloud cover, ceiling height, and solar altitude.