TOML

Typhoon Classification (Intensity and Size) - TOML

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
[[items]]
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 = ""

[[items]]
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 = ""

[[items]]
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 = ""

[[items]]
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

[[items]]
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