Article by: anees

According to the Japan Meteorological Agency, since 1951 the average rainy season has been from around June 7 until July 19

The rainy season varies depending on places in Japan but typically ranges from early June to mid-July. According to the Japan Meteorological Agency, since 1951 the average rainy season has been from around June 7 until July 19. Luckily, meteorologists can more or less predict when the rainy season will begin and end across each region.

Rainy season happens when two bodies of warm air – one from the North Pacific and the other from Southeast Asia – collide with two bodies of colder air from China and the Sea of Okhotsk in early spring. This rather unfortunate meeting results in a period of consistently damp weather for everyone caught in its path as June arrives.

Heavy Rain Fall

According to the Japan Meteorological Agency (JMA), says that common indicators of the phenomenon preceding the localized heavy rain, and lightning, that come with linear rainbands include the sky suddenly turning dark and cold winds blowing.

Japan's Meteorological Agency says an inflow of warm, damp air toward the front has made rain clouds develop, mainly along the Pacific coast. Niijima in Tokyo's Izu island chain is believed to have had 90 millimeters of rain between 7 a.m. and 8 a.m. on 1st July Thursday. Landslide warnings have been issued for Kagoshima and Shizuoka prefectures and the Izu Islands. The agency says a band of rain clouds has developed over Tokyo. The weather information issued for Tokyo supplements an alert level of four or above on a scale of 1 to 5.

a picture of a lightning striking over the dark city in the background

Heavy rain is forecast for the Pacific coast of southwestern, central, and eastern Japan through Friday 2nd July, with localized hourly precipitation of more than 50 millimeters accompanied by thunder and lightning. The Tokai region can expect up to 250 millimeters of rainfall through Friday 2nd July morning, while southern Kyushu, the Amami region, and the Kanto-Koshin region can expect up to 150 millimeters.

By Saturday 3rd July morning, 100 to 200 millimeters of rain is forecast for the Tokai region, 100 to 150 millimeters for southern Kyushu and the Amami region, and 50 to 100 millimeters for the Kanto-Koshin region.

Precaution measures

When heavy rain falls on flat areas, there is a risk of rainwater flowing into underground areas, like shopping centers in urban areas. The JMA suggests evacuating into buildings to escape downpours, but calls for caution when evacuating, as some underground roads may have been flooded, and the covers for manholes on flooded streets above ground may have also been washed away.

Additionally, while the surrounding area may have clear skies, storms in mountain or upriver areas may lead to heavy downstream flooding. When there are reports of rainfall upstream from your location, the JMA advises residents to move away from riverbanks.

"Even a little bit of water running on the ground surface has the possibility of knocking a person over," said a JMA representative. "In areas where the water has become muddy and you can no longer see where you are placing your feet, you should be extra careful of deeper spots."

At the same time, when in open areas, it is important to be careful of lightning strikes. As a precaution, when lightning strikes a tree or other location, to avoid getting struck from the side by an additional discharge of electricity, it is suggested to stay more than 4 meters away from tall structures such as large trees and electric poles. When there are no nearby buildings into which to escape, it is said that keeping your body posture low to the ground is effective in protecting yourself.

When Driving
But driving in rain, as proved by statistics, is very much dangerous. So it is recommended that safety precautions should be taken when driving.

  • Focus Your Attention On Wheel
    Full beam Headlights (If required)
    Good Distance Between Two Cars
    Drive Slowly and Gently
    Turn Defroster in Case of Fog

Evacuation, Emergency Shelters
Evacuation is the last resort. There is no need to evacuate unless there is danger such as a large-scale fire. However, evacuate immediately if the situation becomes life-threatening.

a white sign with a blue circle inside. The text inside the circle is white and says Evacuation route

Evacuate in the following situations
An evacuation order is issued by the city, police department, or fire department, and so on.
Judging from the surrounding conditions, evacuation appears to be necessary such as the occupied building is prone to collapse.
Note: Before evacuation, switch off the breaker to prevent electrical appliances from causing a fire.

Photo by Andre Furtado from Pexels

Photo by Arthur Brognoli from Pexels

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    Anees

    A Social thinker who focuses on intricate genres including human resources, legal affairs, and careers. I am an Indian living in Chiba with my Japanese wife and two daughters while enjoying the beautiful culture, nature, and delicious food of Japan.

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