Kyushu – Tokai Rain clouds and thunderclouds in places Thunderstorms and very heavy rain in the afternoon Be careful of flooding on roads (Weather forecaster, Chief of day shift, September 10, 2023) – Japan Weather Association tenki.jp
Kyushu – Tokai Rain clouds and thunderclouds in places. Thunderstorms and very heavy rain in the afternoon. Be careful of flooding on roads.
September 10, 2023 13:19
Today, the 10th, atmospheric conditions are extremely unstable mainly in western Japan due to warm, humid air and cold air in the upper atmosphere. There are rain clouds and thunderclouds in places from Kyushu to the Tokai region. After this, there will be rain and thunderstorms here and there, with localized “very heavy rain” and “heavy rain.”
Rain clouds and thunderclouds in places from Kyushu to Tokai
Today, the 10th, warm, humid air around the edge of a high-pressure system is flowing from western Japan to northern Japan. Additionally, cold air has entered the skies over western Japan, making the atmospheric conditions extremely unstable.
There are rain clouds and thunderclouds in places from Kyushu to the Tokai region, and lightning is also occurring. In one hour, 64.5 mm of extremely heavy rain fell in Cape Ashizuri, Kochi Prefecture (until 9:40 am). In addition, heavy rain of 37.0 mm (until 9:21 a.m.) was observed at Cape Muroto, Kochi Prefecture, and 30.5 mm (until 11:10 a.m.) in Minamiise Town, Mie Prefecture.
Beware of thunderstorms and very heavy rain in the afternoon
As of 1:00 p.m., rain clouds and thunderclouds have developed over the sea south of western Japan, and they will continue to flow from Kyushu into the Tokai Sea. Rain and thunderstorms are expected to occur here and there from Kyushu to the Tokai region, with localized areas likely to experience “very heavy rain” or “heavy rain” accompanied by thunder. Be careful of flooding on low-lying roads such as underpasses. Also be careful of thunderstorms, tornadoes, and other strong wind gusts.
There will be areas of showers and thunderstorms, mainly in inland areas from Kanto-Koshin to Tohoku. Please be careful of sudden changes in the weather.
What is very heavy rain?
Very heavy rain refers to rain with an hourly rainfall of more than 50 mm and less than 80 mm. This is an image of rain falling like a waterfall and continuing to fall. Also, umbrellas are completely useless, and about half of the people sleeping inside a wooden house notice the rain. Driving outside is dangerous because the water is spraying all over the place, making the area whitish and reducing visibility.
In addition, 50 mm of rain per hour means that if the rainwater does not flow to another place and accumulates, the rain that falls will be 50 mm high. If 50mm of rain falls on 1 square meter in an hour, the amount of rain will be 50 liters. For example, the area of an open umbrella is approximately 1 square meter, so if you hold the umbrella for an hour, the amount of rain that is equivalent to 50 milk cartons will hit the umbrella.
However, in reality, when rainwater from the surrounding area collects, it can accumulate in excess of the amount of rain that fell at that spot. In areas where extremely heavy rain is expected, please be careful of landslides, flooding of low-lying areas, and rising and flooding rivers.
Flooded roads are dangerous, avoid driving
Roads flooded due to heavy rain are dangerous. The water level on flooded roads cannot be determined visually. Even if you don’t think it’s a big deal, it may be at a dangerous depth.
The effects of flooding on a car vary depending on the shape and design of the car, but generally speaking, driving in water that is more than half the height of the tires will cause abnormalities in the engine and electrical system, making it impossible to drive. There is a risk that this may occur. If the tires are completely submerged in water, the vehicle will float and become difficult to move. Furthermore, if the water depth is below the door, the water pressure outside the car will make it difficult to open the door from the inside, and if the door exceeds half the height, it will become almost impossible to open from the inside. If the water gets deeper or the current gets faster, your car may be washed away.
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2023-09-10 04:19:11
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