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
You can feel the wind on your face, and leaves rustle slightly.
6~11
1.6 to 3.3
3
Leaves and small branches move, flags flutter.
12~19
3.4~5.4
4
Dust and paper are lifted, small branches sway.
20~28
5.5 to 7.9
5
Small trees sway, and waves appear in inland waters.
29~38
8.0~10.7
6
Large branches shake, wires whistle, and it's hard to hold an umbrella.
39～49
10.8~13.8
7
The whole tree sways, and walking against the wind is difficult.
50~61
13.9~17.0
8
Twigs break, and movement becomes very difficult.
62～74
17.2~20.7
9
Grass houses are damaged, and large branches break.
75～88
20.8 to 24.4
10
Trees may be blown down, and buildings suffer damage.
89～102
24.5 to 28.4
11
Rarely seen on land, big trees fall, and buildings suffer severe damage.
103～117
28.5~32.6
12
Extremely rare on land, with massive destructive power.
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: Wind speed listed here refers to the wind speed 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 wind speed near its center:
- Level 12 or higher is called a typhoon.
- Levels 10–11 are strong tropical storms.
- Levels 8–9 are tropical storms.
- Below level 8 is considered a tropical depression.
Low Pressure Trough and High Pressure Ridge
On the undulating westerly winds in high altitudes, a trough corresponds to a low-pressure area, where warm and moist air brings rain or snow, while cold air behind the trough causes cooler weather. A ridge corresponds to a high-pressure area, leading to clear skies.
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