2023-04-28 07:23:07
Golden Week 29th to 30th will be wild and stormy Fear of rain like a waterfall Peak of rain and wind
April 28, 2023 16:23
On the 29th (Sat), the first day of Golden Week, it will start raining in Kyushu, Tokai, and Hokuriku, and after the evening, it will rain locally like a waterfall. On the 30th (Sunday), rain and wind are likely to intensify from Kanto to Hokkaido. Please do not overdo it for outdoor leisure.
A front passes over the Japanese archipelago, atmospheric conditions become unstable
From the 29th (Saturday) Showa Day to the 30th (Sunday), a low pressure system with a front will advance in the Sea of Japan. A cold front extending from the low pressure system is expected to pass over the Japanese archipelago. Warm, moist air will flow toward low pressure systems and fronts, destabilizing atmospheric conditions. Rain clouds and thunderclouds will develop, and very heavy rain is likely to fall locally. The wind will pick up and the weather will be rough. Please do not overdo it for outdoor leisure.
The low pressure system and the front move quickly this time, and the weather suddenly becomes rough, but it seems that the weather will recover relatively quickly.
Rain and wind peaks and precautions
[Kyushu, Chugoku, Shikoku]It will rain from around noon on the 29th (Sat) Showa Day. The rain peaks from the evening of Showa Day on the 29th (Saturday) to the early morning of the 30th (Sunday), and it seems that there will be places where it will rain very heavily like a waterfall accompanied by thunder. Be careful of landslides, flooding of rivers, and flooding of low-lying land. The wind will pick up as well. It is expected to gradually clear up during the day on the 30th (Sunday).
[Kinki/Tokai/Hokuriku]29th (Sat) Showa Day will be sunny in the morning. Clouds will increase in the afternoon, and it is likely to rain gradually after the evening. Stormy weather peaks from the late night of Showa Day on the 29th (Saturday) to the morning of the 30th (Sunday). is. Be careful and vigilant of landslide disasters due to heavy rain, flooding of low-lying land, and flooding of rivers. Winds will be strong, especially in coastal areas, and there will be places where it will rain sideways. Driving a car is easy to be swept away by crosswinds, so be careful. The weather is expected to improve in the afternoon of the 30th (Sun).
[Kanto/Tohoku]On the 29th (Saturday) Showa Day, it will be mostly sunny during the day, so it’s a good time to go out. However, it seems that it will start raining in some places later at night. If you are going home late, it would be good to have rain gear. It will rain in a wide area from around the time the date changes, and it is likely to rain intermittently until the afternoon of the 30th (Sunday). Around noon, the rain will intensify and the wind will strengthen.
[Hokkaido]On the 29th (Saturday), Showa Day will be covered in clouds, and it is expected to rain here and there at night. Rain and wind will intensify in the morning of the 30th (Sun), and it will be rough weather. The rain will gradually stop in the afternoon, but the strong wind is likely to continue.
South winds and hot summer days
The highest temperature will be on the 29th (Sat) Showa Day, the south wind will strengthen, and the temperature will rise even if it is cloudy or rainy. From Kyushu to Tokai, it seems that there will be many places around 23 degrees Celsius. In Kanto and Hokuriku, it will be a summer day with maximum temperature of 25℃ or higher in some places. It looks like it’s going to be sweaty. Your body is not yet accustomed to the heat, so please be careful not to get sick from the heat. Even in Tohoku, the temperature will rise to about 25 degrees Celsius in some places. There are many places in Hokkaido where the temperature is around 18℃, which is expected to exceed the average year.
From Kyushu to Tokai and Hokuriku on the 30th (Sunday), it seems that there will be many places with temperatures around 22°C. The Kanto region will have summer days with temperatures above 25°C in some places. Tohoku and Hokkaido are expected to remain above normal at around 20 degrees Celsius.
What is very heavy rain?
Heavy rain refers to rainfall of more than 50mm and less than 80mm per hour. This is an image of rain that falls like a waterfall and continues to fall. Also, umbrellas are completely useless, and about half of the people sleeping inside a wooden house notice the rain. It is dangerous to drive a car outside because the water splashes all over the place and reduces visibility.
It should be noted that 50 mm of rain per hour means that if the rainwater does not flow to another place and remains as it is, the rain will be about 50 mm high. If 50 mm of rain falls on 1 square meter in an hour, it will produce 50 liters of water. For example, the open area of an umbrella is about 1 square meter, so if you open the umbrella for an hour, it will receive rain as much as 50 milk cartons.
However, in reality, when the surrounding rainwater collects, it may accumulate more than the amount of rain that fell at that point. In places where very heavy rain is expected, please be careful of landslide disasters, flooding of low-lying land, and swelling and flooding of rivers.
What is heavy rain?
Heavy rain refers to rainfall of 30 mm or more and less than 50 mm per hour. This is an image of falling like an upside down bucket. In addition, even with an umbrella, about half of the people sleeping inside a wooden house notice the rain. Outside, the road becomes like a river, and cars running on the highway may experience “hydroplaning,” a phenomenon in which a film of water forms between the tires and the road surface, making the brakes inoperable.
In places where heavy rain is expected, it is possible to cause landslide disasters, flooding of low-lying land, and swelling and flooding of rivers, so caution is required.
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