Structured Lists Directory

INI

Typhoon Classification (Intensity and Size) - INI

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 
[item.intensity-strong]
code=intensity-strong
slug=intensity-strong
name=Strong
description=Intensity category for typhoons with maximum wind speeds of 33-43 m/s (64-84 knots).
categoryType=Intensity
windSpeedMaxKt=84
windSpeedMaxMps=43.9
windSpeedMinKt=64
windSpeedMinMps=33
windRadiusMaxKm=
windRadiusMinKm=
windSpeedThresholdMps=

[item.intensity-very-strong]
code=intensity-very-strong
slug=intensity-very-strong
name=Very Strong
description=Intensity category for typhoons with maximum wind speeds of 44-53 m/s (85-104 knots).
categoryType=Intensity
windSpeedMaxKt=104
windSpeedMaxMps=53.9
windSpeedMinKt=85
windSpeedMinMps=44
windRadiusMaxKm=
windRadiusMinKm=
windSpeedThresholdMps=

[item.intensity-violent]
code=intensity-violent
slug=intensity-violent
name=Violent
description=Intensity category for typhoons with maximum wind speeds of 54 m/s (105 knots) or higher.
categoryType=Intensity
windSpeedMaxKt=
windSpeedMaxMps=
windSpeedMinKt=105
windSpeedMinMps=54
windRadiusMaxKm=
windRadiusMinKm=
windSpeedThresholdMps=

[item.size-large]
code=size-large
slug=size-large
name=Large
description=Size category for typhoons with a gale-force wind area (15 m/s or higher) radius of 500-799 km.
categoryType=Size
windSpeedMaxKt=
windSpeedMaxMps=
windSpeedMinKt=
windSpeedMinMps=
windRadiusMaxKm=799
windRadiusMinKm=500
windSpeedThresholdMps=15

[item.size-very-large]
code=size-very-large
slug=size-very-large
name=Very Large
description=Size category for typhoons with a gale-force wind area (15 m/s or higher) radius of 800 km or more.
categoryType=Size
windSpeedMaxKt=
windSpeedMaxMps=
windSpeedMinKt=
windSpeedMinMps=
windRadiusMaxKm=
windRadiusMinKm=800
windSpeedThresholdMps=15