Heat stroke warning alert announced to 22 prefectures, mainly in Tokai and Western Japan

2025/08/29 07:16

Today, the 29th, the sun will be bright and bright from southeastern Tohoku to western Japan, where high pressure is covered.
The forecast maximum temperatures are 26c in Sapporo, 32c in Sendai, 35c in Tokyo, 34c in Kanazawa, 36c in Nagoya, 36c in Osaka, 36c in Fukuoka.
There are many extremely hot days, especially in Tokai to Western Japan, and in Nagoya today, if it's a hot day, it's the 15th consecutive day.
In northern Japan, clouds are likely to spread, and temperatures seem to be suppressed. It will be a relatively comfortable experience.



The Ministry of the Environment and the Japan Meteorological Agency have issued heatstroke warning alerts from East to West Japan, and have been announced to 22 prefectures.


In areas where a heatstroke warning alert has been issued, significantly higher temperatures can cause damage to human health due to heatstroke.
There are probably many people who plan to go out during the summer vacation season, but please refrain from activities during hot weather, and try to take frequent breaks, drink water, and salt.
Also, use air conditioners indoors to ensure that you stay in a cool environment and take full advantage of heatstroke indoors.

Weather today, Friday the 29th: It will gradually rain in northern Japan; East to western Japan will be sunny and sunny

2025/08/29 06:24

Today, the 29th (Friday), a low pressure system accompanied by a front is expected to advance through the Sea of Japan and approach northern Japan. In northern Japan, rain clouds gradually spread, and it seems that umbrellas can be used in some places. Eastern to western Japan will be covered in high pressure, and the weather will be sunny and severe.



Clouds are likely to spread in Hokkaido and northern Tohoku from the morning, and the rain area is expected to gradually expand in the afternoon. It is likely to rain, mainly in the south of Hokkaido and northern Tohoku, and in the northern Tohoku region, the rain will likely fall from night, mainly on the Sea of Japan side. If you are late on your way home, please bring rain gear. In other areas, you can rest assured that you can have a folding umbrella when going out.


In the southern Tohoku region and eastern to western Japan will be covered in high pressure and the sunlight will be shining. The heat is severe, especially in Tokai to western Japan, so please take full precautions against heatstroke.
In the afternoon, you should be careful of local thunderstorms, mainly along the mountains.

Tokyo escapes from consecutive hot days, and the heat has risen once again from weekends, "very high temperature" in September [Weekly weather]

2025/08/28 13:30

Cool air from the northeast is flowing in today, and the heat is subsidering in the areas north of Kanto.

In central Tokyo, the hottest days of
35c or higher for 10 consecutive days until Wednesday, August 27th, the highest temperature until noon today, Thursday, August 28th, is 32.8c and is free from the hottest days.

However, starting the weekend, the "extremely lingering heat" will once again be revived in the Kanto region, with many days likely to be extremely hot in excess of 35 C.





As September enters, the weather is widely cloudy and rainy due to the effects of fronts and humid air, but
The "high temperature trend" is expected to continue, especially in the west and eastern Japan, and
The exit of the heat is not easily visible.



In addition, the Japan Meteorological Agency's other day's "Early Weather Information on High Temperatures" will be displayed in red all over the country from August 31st to September 8th, and "quite high temperatures" are expected to be "very high temperatures."

Even in September, the risk of heat stroke continues.



Please continue to take measures against heat stroke, such as frequently hydrating when doing outdoor activities, and ensuring adequate shade, and
Please be careful about your health management.
Please also be careful about managing agricultural crops and livestock.

The largest sea surface temperature in the waters around Hokkaido is 6 C higher than normal, and Typhoon No. 12 lands in Kagoshima [Marine Summary (August 17-23, 2025)]

2025/08/28 11:08

The sea surface temperature around Hokkaido was up to 6 C high. However, the waters that were significantly higher than normal have been reduced.
Below is a summary of the oceans (August 17th to 23rd, 2025).



#Pressure configuration and waves
On the 18th and 20th, a tropical cyclone headed northwards south of Okinawa and west of Kyushu.
Waves rose around the tropical cyclone, and on the 18th, the wave height reached a maximum of 3m in the south of Okinawa.
On the 21st, the tropical cyclone developed into Typhoon No. 12 at 9am, and landed near Hioki City, Kagoshima Prefecture after 5pm.
Waves have risen slightly on the west of Kyushu, near the Nansei Islands, and on the eastern coast of Kyushu.
After Typhoon No. 12 made landfall, it lost its strength and crossed Kyushu.
At 9am on the 22nd, the virus was transformed into a tropical cyclone in the Hyuga Nada.
The waves rose in the Hyuga Nada, around the tropical cyclone.
Another tropical cyclone moved westward east of the Philippines and developed in the South China Sea at 9am on the 23rd to Typhoon No. 13.
The waves have risen slightly in the waters near the Sakishima Islands.



#Sea surface temperature
The sea surface temperature in the Japanese Sea continued to be higher than normal, gradually increasing on the central continent side, reaching 4 C higher than normal.
In the East China Sea and the Southwestern Islands, the average sea area continued.
On the Pacific side, the waters near the Izu Islands continued to be in normal conditions, and slightly lower than normal waters have been reduced.
There was a higher than normal water area off the coast of Sanriku.
The temperature was up to 6 C higher than normal offshore off the coast of Hokkaido and the east of Kurishima Island.
However, the waters that were much higher than normal gradually reduced, and fell below normal in the waters near the Kuril Islands.

It's also hot west of Tokai today. The heat peaks nationwide this week are weekends.

2025/08/28 10:09

The Sea of Okhotsk has a low pressure system that moves eastward, with a front extending from the East Sea of Japan to the south of Kanto.
On the other hand, there is a high pressure system in the Primordia and the East China Sea, spreading around Japan.
Currently, there are many sunny spots, but there are some areas where it is raining, such as Hokkaido.



Today, in northern Japan and Hokuriku, clouds are spreading, but it will gradually clear up.
In East and Western Japan, Amami and Okinawa, there are some areas where clouds are likely to appear in the Kanto, Kinki and Chugoku regions, but there are many areas where it is sunny, and the atmosphere is unstable in the afternoon, making it likely that there will be heavy rain and thunderstorms locally. Be careful of sudden rain and lightning strikes.



Also, although temperatures are dropping slightly north of Kanto today, the heat continues west of Tokai.




From tomorrow onwards it will be hot nationwide with the weekend, and the weekend will likely be high nationwide and dangerous heat.
Please be careful when managing your physical condition, such as heat stroke, and agricultural crops.

Tokyo's longest ever hot days!! In the afternoon, there are places where extremely heavy rain like waterfalls in Kanto

2025/08/27 13:10

#Records have been broken!! Central Tokyo: The longest consecutive days of extremely hot days, the highest number of days per year
Today, Wednesday the 27th, the Kanto region is covered by the Pacific high pressure system, and strong sunlight has been shining since the morning.
Also, the front extends into the Sea of Japan from the low pressure system in the Sea of Okhotsk, causing warm, humid air to flow towards the front.



In the Kanto region, temperatures rose faster than yesterday (Tuesday), and in central Tokyo it reached 35 C in the morning.
This marks the 10th consecutive record of hot days in central Tokyo, bringing it to the longest ever.
The number of days in the year was the 23rd day, the highest ever, marking the highest ever, and this record has also broken.
It's probably when the heat is continuing and your body is getting tired. Be very careful of heat stroke.

#Sudden weather changes in the front line Very heavy waterfall-like rain in the Kanto region
Today, the 27th (Wednesday), the front is expected to move south through the Kanto region.
In Kanto, the air condition will become extremely unstable late into the night due to rising daytime temperatures and the effects of warm, humid air flowing towards the front.



In the southern Kanto region, there are areas where heavy rain with thunder will fall from the evening today, Wednesday the 27th to the beginning of the night.
Even in Tokyo, there are likely places where heavy rain falls, like a 40mm bucket turned over every hour.
In many places, 80mm of rain is expected to fall in 24 hours.


In the northern Kanto region, there are areas where heavy rain with thunder and extremely heavy rain will fall from the afternoon until late at night today, the 27th.
In particular, in Tochigi Prefecture, rain clouds will develop, and there will be areas where extremely heavy rainfall, such as a 60mm waterfall per hour.
In many places, 100mm of rain is expected to fall in 24 hours.


If the rain clouds develop more than expected or if the developed rain clouds continue to hit, there is a risk of heavy rain at the warning level.

In Kanto, beware and beware of low-lying flooding of land, rising rivers, and landslides from the afternoon until late at night today, the 27th (Wednesday).

Weekly weather: Weather changes over short periods in Northern Japan, severe heat in East to Western Japan continues on from September onwards

2025/08/27 08:02

From now on, the weather will likely change in northern Japan over a short period.
The severe heat in eastern and western Japan will continue to continue from September onwards.



Looking at the forecast for the atmospheric pressure layout tomorrow, the 28th, low pressure and front lines will leave Japan, and the area around Honshu will be widely covered by high pressure. The heat in northern Japan is likely to ease. Meanwhile, the heat continues from eastern to western Japan, and many places are likely to experience extreme heat, especially in western Japan.



Looking at the forecast weather maps for the future, it is expected that low pressure and fronts will pass intermittently in northern Japan. In Sapporo and other places, it is likely that there will be days when the morning minimum temperature drops below 20 C.
In Hokkaido, rain will likely fall on this weekend, Saturday the 30th, Monday the 1st and Tuesday the 2nd due to low pressure and fronts. Even on the Hokuriku and Western Japan Pacific side, rain is likely to fall due to the effects of low pressure and front lines, and it seems that there are some areas where the rain is getting stronger.


East and Western Japan are expected to remain strong in the Pacific High Pressure Power, and the heat is likely to continue even after the change in September. It is expected that the days will be extremely hot every day in Nagoya and Osaka, and over a wide area of eastern and western Japan, temperatures will not fall at night even during the night, and many tropical nights will continue even in September. The harsh heat is not over, but please do not neglect to prevent heatstroke day and night.

Behind the south of the cold front, be careful of gusts of winds such as heavy rain, lightning strikes, tornadoes, etc. with lightning over a wide area.

2025/08/27 07:07

A low pressure system accompanied by a front has passed around the Soya region of Hokkaido. A cold front extending from the center of the front leads southwards around Honshu, with a continuous stream of zone-like heavy rainfalls from the Tohoku Sea of Japan side to Kyushu near the front.



As of 6am today, the 27th, Tomikucho, Hokkaido is the number one in total of 24-hour rainfall so far, with 193mm. This amounts to about 1.6 times the amount of rain in August, and means that more than one month's worth of rain fell in one day. In Hokkaido and Akita Prefecture, heavy rain warnings (flood and landslides), flood warnings, and landslide warnings have been issued.


There have been some areas where the ground has been loosened due to heavy rainfall in the Tohoku Sea of Japan side. Even a small amount of rain can cause landslides, so be vigilant. Also, beware of low-level land flooding, rising rivers, and flooding, and be careful of severe gusts of winds such as lightning strikes and tornadoes.



The area of rain is expected to expand from the Sea of Japan side from Kanto to Kyushu. Be careful of sudden changes in the weather in the afternoon. As the front moves south, there is a high possibility that thunderclouds will develop rapidly, mainly inland from western Japan to eastern Japan. Be careful of sudden heavy rain and thunderstorms from the afternoon until tonight.

Heavy rains are widely wary of the weather (Wednesday) - even after the heat has subsided, west to east Japan cannot see the outskirts of extreme heat [weekly weather]

2025/08/26 12:08

From tonight to tomorrow, the 27th (Wednesday), a low pressure system accompanied by the front is expected to pass through the area around Hokkaido, developing.



Summer air is on the south side of the front extending from the cyclone, and autumn air is on the back, and
Different air (seasonal change) collides violently near the front.

For this reason, when the front passes, rain and thunderstorms are especially prone to becoming severe.

Until tomorrow, the 27th (Wednesday) will see heavy warning-level rainfall, especially in northern Japan and the Sea of Japan.



It is expected that the amount of rain will be higher in particular in northern Japan, and the expected amount of rain is high:

24-hour precipitation until 6am tomorrow, the 27th (Wed)

24-hour precipitation until 6am tomorrow, the 27th (Wed) - 6am (Thursday), the 28th (Hokkaido Region: 80mm
Tohoku Region: 100mm


24-hour precipitation from 6am tomorrow, the 27th (Wed) - 6am (Thursday), the 28th (Hokkaido Region: 80mm



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In northern Japan, the ground has been loosened due to previous heavy rain, so even a small amount of rain can increase the risk of landslides.

In areas where heavy rain is expected, do not approach cliffs or mountains, and
Please stay in a safe place, such as resting in a room on the opposite side of the cliff on the second floor or above.




As the impact of fronts extending from low pressures passing through
Alarm-level heavy rain could occur in areas on the Sea of Japan side of the West Japan and eastern Japan.






























































































































































































































































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It will rain widely tomorrow, the 27th (Wednesday), and

/The heat will likely be temporarily subsided in many places.

However, in the west to eastern Japan, there are many places where the days of hot weather exceed 35 C again from the weekend, and we cannot see the exit for the "extremely lingering heat."


There is a "high temperature" expected to continue through September, so please continue to be careful of heat stroke.


On the other hand, in northern Japan, the full-scale "Autumn Rainy Season" has begun
/Rain is falling every few days, and each day you will be able to feel the signs of autumn.

Approaching the low pressure system: Hokkaido is strictly wary of heavy rain disasters tomorrow, the 27th

2025/08/26 07:01

A low pressure system with a front is located near the Primcoean province, moving east-northeast. As this low pressure system develops, it will progress from the northern Sea of Japan to the Sea of Okhotsk tomorrow, tomorrow, the 27th, with a warm front going north through the Hokkaido region today, the 26th, and a cold front going south through northern Japan tomorrow, the 27th. As warm, humid air flows towards the fronts and low pressures, air condition is expected to become extremely unstable in northern Japan.



[Rain Prediction]
In northern Japan, heavy rain will likely fall with lightning or very heavy rain, leading to heavy rain. Previous heavy rains can increase the risk of landslides and flood disasters with less than normal rain. In addition, in the Soya region of Hokkaido, the total rainfall for tomorrow, the 27th may exceed the average month of August.

#Expected amount of rain (in places)
+24-hour precipitation expected by the dawn tomorrow, the 27th
Hokkaido: 180mm
Tohoku: 100mm
24-hour precipitation expected by the dawn tomorrow, the 28th
Hokkaido: 80mm
Tohoku: 100mm

[Disaster Prevention Issues]
In the Hokkaido region, be careful of landslides, low-level flooding, river flooding and flooding, and in the Tohoku region, be careful of landslides, low-level flooding, river flooding and flooding. Also, be careful of severe gusts of wind in northern Japan, such as lightning strikes and tornadoes. If there are signs of developing cumulonimbus clouds approaching, try to ensure your safety by moving inside a sturdy building. There is a risk of falling hail, so be careful when managing agricultural crops and agricultural facilities.