Hourly Precipitation (mm) | Forecast Terms | Image that people receive | Influence on people | Indoor (in the case of wooden house) | Outdoor | When riding a car |
---|---|---|---|---|---|---|
10 or more - less than 20 | Slightly Heavy rain | Amid driving rain (The rain sounds like “Zah Zah”) | The feet get wet by rain splashing from the ground | Being unable to hear one’s voice well due to rain | There are puddles on the whole ground | |
20 or more - less than 30 | Heavy rain | Dousing rain | Getting wet even with an umbrella | Taking approximately half of sleeping people notice the rain | Visibility is poor even with a faster wiper | |
30 or more - less than 50 | Intense rain | Rain as if a bucket of water is being emptied | Roads become like a river | When driving at high speed, a water film is formed between the wheel and the road surface and the brake does not work. (hydroplaning phenomenon) | ||
50 or more - less than 80 | Very intense rain | Rain in torrents (constant rain with rasping sound like “Goh Goh”) | Umbrella is useless at all | Splashing makes the surroundings whitish and poor visibility | Driving a car is dangerous | |
80 or more - | Torrential rain | Feeling of pressure that makes feel stuffy. Feeling of fear. |
Source: Created with reference to Japan Meteorological Agency website
(Prepared in August 2000, partially amended in January 2002, in March 2017 and in September 2017)
Emergency Warning |
Heavy rain、Storm、Snow-storm、Heavy snow、High waves、Storm surge |
Warning | Heavy rain、Flood、Storm、Snow-storm、Heavy snow、High waves、Storm surge |
Advisory | Heavy rain、Flood、Gale、Gale and snow、Heavy snow、High waves、Storm surge、Thunderstorm、Snow melting、Dense fog、 Dry air、Avalanche、Low temperature、Frost、Ice accretion、Snow accretion |