2023-09-20 09:13:15
Guerrilla thunderstorms in Kanto and other areas tonight. Widespread instability tomorrow, the 21st. Warning-level heavy rain possible in Tohoku and other areas.
September 20, 2023 18:13
Tonight (20th), watch out for guerrilla thunderstorms in eastern Japan, including the Kanto region. Tomorrow, the 21st (Thursday), the atmospheric conditions remain widely unstable. There is also a risk of warning-level heavy rain in areas such as Tohoku. Caution and vigilance are required to prevent landslides and river flooding caused by heavy rain.
Be careful of guerrilla thunderstorms when returning home
Today, the 20th (Wednesday), atmospheric conditions are unstable over a wide area from Kyushu to Tohoku. From the evening onwards, heavy rain, as much as an overturning bucket of over 30 mm per hour, was falling in localized areas, mainly in eastern Japan, including the Kanto and Tokai regions.
Towards late tonight (the 20th), extremely heavy “cascading rain” of more than 50 mm per hour will fall in some places, mainly in eastern Japan including the Kanto region. If rain clouds develop more than expected or stay in the same place, there is a risk of “warning-level heavy rain.”
Please be on the lookout for thunderstorms, tornadoes, and other strong wind gusts through the early hours of tomorrow, Thursday the 21st.
If you hear rumblings of thunder or suddenly feel cold wind blowing, it’s a sign that thunderclouds are approaching. Please try to ensure your safety by evacuating to a sturdy building.
Additionally, there is a risk of hailstorms, so please be careful when managing crops and agricultural facilities.
[雨の予想]
The predicted hourly precipitation on the 20th is high in all places.
Northern Kanto region 40mm
Southern Kanto region 50mm
The predicted 24-hour precipitation from 6:00 p.m. on the 20th to 6:00 p.m. on the 21st is expected to be high in all areas.
Northern Kanto region 80mm
Southern Kanto region 80mm
This is expected.
The front that separates the seasons gradually moves southward.
Tomorrow, the 21st (Thursday), the low pressure front is expected to move toward northern Japan, and on the 22nd (Friday), the front is expected to gradually move southward to the southern coast of Honshu. Warm, humid air will flow towards the low pressure system and front, and atmospheric conditions are expected to continue to be extremely unstable over a wide area from Kyushu to Tohoku into the night of tomorrow, the 21st (Thursday).
There is autumn air to the north of the front, and summer air to the south, and the conflict continues. On the 23rd (Saturday: Autumn Equinox Day), the front is expected to move down to the southern coast of Honshu, and the area around Honshu will be covered by a migratory high pressure system. This weekend (23rd and 24th) it will be sunny all over the country, and many places will have crisp autumn skies during the day.
Tomorrow 21st (Thursday) Locally extremely heavy rain from Kyushu to Tohoku
Tomorrow, the 21st (Thursday), rain and thunderstorms will occur over a wide area from Kyushu to Tohoku. Rain clouds are forming locally and there is a risk of heavy rain.
The amount of rainfall expected in the 24 hours up to 6pm on the 21st is heavy in some places.
Northern Kyushu region 120mm
Tokai region, Hokuriku region, Chugoku region, Shikoku region 100mm
Tohoku region, Kanto-Koshin region, Kinki region 80mm
This is expected.
Tohoku is at risk of warning-level heavy rain
Tomorrow, the 21st (Thursday), the possibility of warning-level heavy rain is “medium” across a wide area from Kyushu to Tohoku, and is “high” in Akita.
Through the night of the 21st, people need to be on guard against landslides caused by heavy rain, rising river waters, and gusty winds such as lightning strikes and tornadoes.
What is extremely heavy “waterfall-like 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 (in areas where extremely heavy rain has fallen), please be careful of landslides, flooding of low-lying areas, and rising/flooding of rivers.
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