picture is courtesy of Hawaii.edu.
The chart color codes intensity (category based on Saffir-Simpson scale):
| Type | Category | Pressure (mb) | Winds (knots) |
Winds (mph) |
Surge (ft) | Line Color |
| Depression | TD | ----- | < 34 | < 39 | Green | |
| Tropical Storm | TS | ----- | 34-63 | 39-73 | Yellow | |
| Hurricane | 1 | > 980 | 64-82 | 74-95 | 4-5 | Red |
| Hurricane | 2 | 965-980 | 83-95 | 96-110 | 6-8 | Light Red |
| Hurricane | 3 | 945-965 | 96-113 | 111-130 | 9-12 | Magenta |
| Hurricane | 4 | 920-945 | 114-135 | 131-155 | 13-18 | Light Magenta |
| Hurricane | 5 | < 920 | >135 | >155 | >18 | White |
NOTE:Pressures are in millibars and winds are in knots where one knot is equal to 1.15 mph.