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Typhoon Classification (Intensity and Size) - HTML
The Japan Meteorological Agency classifies typhoon intensity and size separately as indicators of approximate strength. 'Intensity' is classified as 'Strong' at 33 m/s or above, 'Very Strong' at 44 m/s or above, and 'Violent' at 54 m/s or above. 'Size' is classified as 'Large' when the radius of the gale-force wind area (15 m/s or above) is 500 km or more, and 'Very Large' at 800 km or more. These classifications are combined to create expressions like 'Large and Strong Typhoon' and are widely used in disaster prevention information.
JMA
typhoon
meteorology
disaster prevention
wind speed
gale-force wind area
storm wind area
<table>
<thead><tr><th>code</th><th>slug</th><th>name</th><th>description</th><th>categoryType</th><th>windSpeedMaxKt</th><th>windSpeedMaxMps</th><th>windSpeedMinKt</th><th>windSpeedMinMps</th><th>windRadiusMaxKm</th><th>windRadiusMinKm</th><th>windSpeedThresholdMps</th></tr></thead>
<tbody><tr><td>intensity-strong</td><td>intensity-strong</td><td>Strong</td><td>Intensity category for typhoons with maximum wind speeds of 33-43 m/s (64-84 knots).</td><td>Intensity</td><td>84</td><td>43.9</td><td>64</td><td>33</td><td></td><td></td><td></td></tr>
<tr><td>intensity-very-strong</td><td>intensity-very-strong</td><td>Very Strong</td><td>Intensity category for typhoons with maximum wind speeds of 44-53 m/s (85-104 knots).</td><td>Intensity</td><td>104</td><td>53.9</td><td>85</td><td>44</td><td></td><td></td><td></td></tr>
<tr><td>intensity-violent</td><td>intensity-violent</td><td>Violent</td><td>Intensity category for typhoons with maximum wind speeds of 54 m/s (105 knots) or higher.</td><td>Intensity</td><td></td><td></td><td>105</td><td>54</td><td></td><td></td><td></td></tr>
<tr><td>size-large</td><td>size-large</td><td>Large</td><td>Size category for typhoons with a gale-force wind area (15 m/s or higher) radius of 500-799 km.</td><td>Size</td><td></td><td></td><td></td><td></td><td>799</td><td>500</td><td>15</td></tr>
<tr><td>size-very-large</td><td>size-very-large</td><td>Very Large</td><td>Size category for typhoons with a gale-force wind area (15 m/s or higher) radius of 800 km or more.</td><td>Size</td><td></td><td></td><td></td><td></td><td></td><td>800</td><td>15</td></tr></tbody>
</table>