Kyushu Wind Rating Chart
Wind Level
Land Surface Object Signs
Sea Wave / Wave Height (m)
Wind Speed
km/h | m/s
0
Smoke rises straight up, no wind.
Less than 1
0 to 0.2
1
Smoke shows the direction of the wind.
1-5
0.3 to 1.5
2
Slight breeze felt on face, leaves move slightly.
6~11
1.6 to 3.3
3
Leaves and small branches flutter, flags extend.
12~19
3.4~5.4
4
Dust and paper lifted, small branches sway.
20~28
5.5 to 7.9
5
Small trees sway, waves appear in inland waters.
29~38
8.0~10.7
6
Large branches move, wires whistle, umbrellas hard to hold.
39～49
10.8~13.8
7
Trees shake, walking against the wind is difficult.
50~61
13.9~17.0
8
Twigs break, movement becomes very difficult.
62～74
17.2~20.7
9
Grass houses damaged, large branches break.
75～88
20.8 to 24.4
10
Trees can be uprooted, buildings suffer damage.
89～102
24.5 to 28.4
11
Rare on land, big trees fall, buildings are severely damaged.
103～117
28.5~32.6
12
Very rare, highly destructive force.
118～133
32.7~36.9
13
134~149
37.0~41.4
14
150~166
41.5~46.1
15
167~183
46.2~50.9
16
184~201
51.0~56.0
17
202~220
56.1~61.2
*Note: The wind speed listed here refers to the speed measured at 10 meters above ground level on flat terrain.
Typhoon and Tropical Storm
A low-pressure system that forms over tropical oceans is known as a tropical cyclone. Internationally, its intensity is classified based on the maximum sustained wind speed near its center:
- Level 12 or higher: Typhoon
- Levels 10–11: Strong Tropical Storm
- Levels 8–9: Tropical Storm
- Below Level 8: Tropical Depression
Low Pressure Trough and High Pressure Ridge
On the undulating westerly airflow at high altitudes, a trough corresponds to a low-pressure area. The warm, moist air ahead brings rain or snow, while the cold air behind the trough causes cooler weather. A ridge corresponds to a high-pressure area, leading to clear skies.
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