Due to the influence of the front and low pressure, a linear rain belt was confirmed in Niigata Prefecture and Yamagata Prefecture even after 6:00 pm, and it was a record-breaking heavy rain that exceeded expectations.
In Niigata and Yamagata prefectures, there is a risk of extremely heavy rain through the night of the 3rd.
Due to the fact that the front will move southward on the 4th, there is a risk of heavy rain in the Hokuriku and Kinki regions, excluding Niigata, so please pay attention to the latest weather information.
Linear precipitation belts in Niigata and Yamagata
According to the Japan Meteorological Agency, rain clouds developed in Niigata Prefecture and Tohoku due to the influence of a front with low pressure in the Tohoku and Hokuriku areas, resulting in more heavy rain than expected.
According to the Japan Meteorological Agency, a linear rain belt was confirmed, and very heavy rain continued to fall in the same place. Around half past one, we also announced "information on significant heavy rain" in Okitama, Yamagata Prefecture.
Niigata and Yamagata prefectures continue to be covered by well-developed rain clouds.
In the hour until 6:00 p.m.,
the rain gauge installed in Iide-machi by Yamagata Prefecture recorded 64 mm,
and the rain gauge installed in Murakami City by Niigata Prefecture recorded 57 mm.
The amount of rainfall in the 12 hours until 6:00 pm was
▽ 230 mm on three sides in Murakami City, Niigata Prefecture, and
▽ 175 mm on Takamine in Iide Town, Yamagata Prefecture, both of which were the highest in recorded history.
In addition, on the morning of the 3rd, a "linear rain belt" was confirmed in Aomori and Akita prefectures, and although the rain is weakening in the northern part of Tohoku, the high risk of disasters continues in various places.
Due to the heavy rains to date, the risk of sediment-related disasters has increased significantly in Niigata, Yamagata, Fukushima, and Iwate prefectures. In , there is a river that exceeds the "flood danger water level", which has a very high risk of flooding.
Southern Tohoku/Niigata: Extremely heavy rain likely overnight
This is the outlook for the future.
In the southern part of Tohoku and Niigata Prefecture, it will rain very heavily over the night of the 3rd, and there is a risk that the amount of rain will increase further.
In addition, heavy rain is expected in Kinki and Kanto Koshin on the 4th due to the cold air flowing into the sky as the front moves south.
The amount of rain falling in the 24 hours until the evening of the 4th
is expected to be
130 mm in Hokuriku including Niigata Prefecture
, 100 mm in Kanto Koshin and Kinki, and 80 mm in Tohoku.
The Japan Meteorological Agency has urged people to be on high alert for landslides, low-lying land inundation, and river flooding in areas hit by heavy rain.
With the danger of life-threatening disasters rising, especially in Niigata and Yamagata prefectures, it is now night.
If you can confirm the safety of your surroundings, evacuate to an evacuation shelter or a nearby sturdy building, or move to the second floor or higher of the building.
why did it rain
The Tohoku and Niigata prefectures experienced record heavy rainfall, with successive announcements of record-breaking short-term heavy rainfall reports, and the occurrence of linear rainfall belts being confirmed one after another.
Why did it rain so much more than the original forecast?
The Japan Meteorological Agency believes that a large amount of moist air was supplied from a tropical cyclone that changed from Typhoon No. 6, which approached Okinawa at the end of July.
After approaching Okinawa at the end of July, Typhoon No. 6 turned into a tropical cyclone near the East China Sea on August 1 and moved northward near the Korean Peninsula.
On the 3rd, a front stretched from the Sea of Japan to the Tohoku region, but according to the Japan Meteorological Agency, a large amount of warm, moist air was flowing toward this front from the south as if to go around the edge of the high pressure system, and also from a tropical cyclone. It is believed that rain clouds developed one after another due to the supply of
According to the Japan Meteorological Agency, in the first half of next week, humid air is likely to flow around the edge of a high pressure system in northern Japan, and there is a risk that precipitation will increase mainly on the Sea of Japan side.
The Japan Meteorological Agency is urging people to be extremely vigilant against landslides and river flooding in areas that are currently experiencing heavy rain, and is urging them to pay attention to the latest weather information in northern Japan.