Rainy season front stagnates; Tohoku Sea of Japan side is on high alert for landslides

2026/08/01 07:04

A low-pressure system is located in the Sea of Japan, and a front is extending from the Northeastern District of China to the Tohoku region. This low pressure system is expected to pass through the Tohoku region tomorrow, the 2nd (Sunday), and move towards the east of Japan.
Atmospheric conditions are unstable as warm, humid air is flowing toward fronts and low pressure systems.

By 3 o'clock, extremely heavy rain was being observed at Kaneyama in Yamagata Prefecture, at 59 mm/h, and at Sasunabe in Mamurogawa Town, at 55.0 mm/h, making it the highest rainfall in history for this location in Kanayama.
As of 6:50, there are areas in Akita, Iwate, and Yamagata prefectures where a Level 4 landslide warning has been issued.

Today, the 1st (Saturday), heavy rain is expected to occur in the Tohoku region, accompanied by thunder, and there will be heavy rain in some places.



On the Sea of Japan side of Tohoku, please be on high alert for landslides caused by heavy rain until the evening of today, 1st (Saturday), and be careful of flooding of low-lying land, rising water levels and flooding of rivers. After that, please continue to be careful in the Tohoku region for flooding of low-lying areas and rising river waters until dawn on Sunday, the 2nd, and for landslides until late at night on Sunday, the 2nd. The ground has become loose in some places due to the rain that has fallen so far, so even a small amount of rain can increase the risk of landslides.
Also, be careful of lightning strikes and gusts of wind in the Tohoku region.

#Expected amount of rain (in places where there is a lot)
+Precipitation expected for 1 hour today (Saturday)
Tohoku Sea of Japan side 40mm
Tohoku Pacific side 30mm
+An hourly precipitation expected for tomorrow 2nd (Sunday) Tohoku Japan Sea side 30mm
Tohoku Pacific side 20 mm
+Precipitation amount expected for 24 hours by 6:00 tomorrow 2nd (Sunday)
Tohoku Sea of Japan side 120 mm
Tohoku Pacific side 100 24-hour precipitation expected by 6:00 a.m. on the 3rd (Monday) the following day: Tohoku Sea of Japan side 60 mm
Tohoku Pacific side 30 mm

Weather for today (Saturday): Heavy rain in Tohoku; sunny and extremely hot in Kanto and westward

2026/08/01 06:34

The rainy season front is expected to remain in northern Japan today, the 1st (Saturday). It will be a rainy day in northern Japan. From the Kanto region to the west, a high pressure system covers the area and the weather continues to be sunny and extremely hot, so people need to be careful of heatstroke.



Clouds tend to spread in northern Japan, and intermittent rain will continue mainly in Tohoku. In the northern Tohoku region, the rain is expected to increase locally, causing heavy rain and thunderstorms in some places. The ground has become loose in some places due to the rain that has fallen so far, so even a small amount of rain can increase the risk of landslides. Please be extremely careful about landslides.

It is expected to be sunny and bright with strong sunlight from the Kanto region to western Japan. In many places, the heat will be dangerously high, exceeding body temperature, and in some places it will be as hot as an extremely hot day. Please continue to take all possible precautions against heat stroke, such as staying hydrated and taking salt supplements.
In addition, rain clouds are expected to develop locally in the afternoon, mainly along the mountains of the Kanto region. Please pay attention to changes in the sky.

[Ocean Summary] Seas near Japan remain relatively calm (July 19-25, 2026)

2026/07/31 11:41

Although there were times when the waves were high due to low pressure and fronts, the seas around Japan remained relatively calm.
Below is a summary of the ocean (July 19-25, 2026)



#Pressure distribution and waves
From the 19th to the 22nd, the front moved from central China to the Sea of Japan and stalled near northern Japan. From the 19th to the 20th, a low-pressure system separated from the front moved northeast across the southern Sea of Okhotsk from west of Hokkaido, resulting in high waves of around 3.0 m on the Pacific side of Hokkaido. From the 23rd to the 25th, the front gradually moved southward to the Kanto region. From the 24th to the 25th, the tropical cyclone turned into Typhoon No. 12 and moved westward in the South China Sea, causing waves to reach a height of 3.0 meters in the Sakishima Islands on the 25th. During this period, the Pacific high pressure system was mostly stationary south of the front, so the waves in the Japanese waters and the Pacific side of western Japan were around 1.0m in height.



#Sea surface temperature
Sea surface temperatures near Japan are expanding in areas where they are higher than normal. Continuing from the previous week, temperatures were significantly higher than normal mainly in the northern part of the country, with temperatures up to 5 C higher than normal off the southeastern coast of Hokkaido. Sea areas in Japan continued to be warmer than normal, with temperatures reaching a maximum of 4 C above normal. Sea surface temperatures in the East China Sea and the waters near the Nansei Islands were slightly lower than normal in the first half of the week, but from the second half of the week they ranged from normal to slightly higher than normal. Sea areas off the southeastern coast of the Kanto region continue to be slightly lower than normal. In the waters near the Kuril Islands, the area of higher-than-normal waters has shrunk.

Weather for today, the 31st (Friday): Rain in northern Japan and Hokuriku; intense heat continues from Kanto to western Japan

2026/07/31 07:05

Today, the 31st (Friday), it will rain from Hokkaido to Tohoku and Hokuriku due to the effects of low pressure and a trough of pressure. There are areas where the ground has become loose due to the rain that has fallen so far, so caution and vigilance against landslides is required.
West of the Kanto region, there will be many sunny and extremely hot days. Please be careful of heat stroke.



A low pressure system is located east of Japan and moving northeast. Another low pressure system is located west of Hokkaido and is moving slowly southward. On the other hand, there is an anticyclone in the East China Sea that gently covers western and eastern Japan.

Currently, it is raining in some places in Hokkaido, Niigata Prefecture, Fukushima Prefecture, and northern Kanto.
There are places in Fukushima Prefecture where level 4 landslide warnings have been issued. Please be on high alert for landslides until noon.

Atmospheric conditions continue to be unstable in northern Japan and Hokuriku, with warm, humid air flowing toward low-pressure systems and troughs.
Please be careful of landslides, flooding of low-lying areas, and rising river waters. Also, be careful of lightning, tornadoes, strong wind gusts, and hail.

Sunlight will reach from Kanto-Koshin to western Japan and Okinawa.
However, please be careful of sudden thunderstorms in the afternoon in Kanto-Koshin. Please carry a folding umbrella or an umbrella for both rain and shine, and pay attention to changes in the sky.



It is expected to be an extremely hot day with maximum temperatures of over 35c from Kanto-Koshin to western Japan. Please continue to be careful of heat stroke.
Even in Kumamoto Prefecture, which suffered damage from the recent earthquake, temperatures are expected to reach 36 degrees Celsius, which is similar to body temperature. Those involved in recovery work should take frequent breaks and remember to replenish water and an appropriate amount of salt.

[1-month forecast] Temperatures will be high nationwide in August. Take precautions against heat stroke and be careful of typhoons.

2026/07/30 23:29

On the 30th (Thursday), the Japan Meteorological Agency announced the forecast for the month from August 1st to 31st.

Over the next month, temperatures are expected to be high as the country will likely be covered in warm air. In particular, temperatures are expected to be quite high in northern and western Japan during the first half of the period.
Okinawa/Amami is susceptible to typhoons and humid air during the first half of the season, so there will be a lot of precipitation.



Prediction results from the numerical forecast model.
Monthly average sea level pressure (figure on the left) shows that a low pressure system is predicted to the south of Japan, and in the first half of the period, Okinawa and Amami are expected to be affected by typhoons and humid air. On the other hand, the atmospheric pressure is high near Hokkaido, and during the first half of the period, it is likely to be covered in high pressure mainly over northern Japan and the Sea of Japan side of eastern and western Japan.

The temperature at an altitude of approximately 1,500 meters (figure on the right) will be higher than normal near Japan, especially in northern Japan, and the whole country will likely be covered in warm air.




Forecast of average temperature, precipitation, and sunshine hours for the next month, and weekly average temperature (probability of occurrence (%)).

The average temperature will be high as the whole country is likely to be covered with warm air. In particular, temperatures are expected to be quite high in northern, eastern, and western Japan during the first half of the period.

Northern Japan and the Sea of Japan side of eastern and western Japan are likely to be covered by high pressure during the first half of the period, so precipitation will be at or below normal and sunshine hours will be at or above normal. It looks like there will be more sunny days compared to normal years.

The Pacific side of eastern and western Japan will have many sunny days, similar to normal years.

Okinawa/Amami will be susceptible to the effects of typhoons and humid air during the first half of the season, so precipitation will be high and sunshine hours will be at or below normal. It is expected that there will be fewer sunny days compared to normal years.


In August, temperatures are expected to be higher than normal across the country. The severe heat is expected to continue, so please continue to take precautions against heatstroke.
I'm sure some of you are planning some outdoor leisure activities during your summer vacation. Please take frequent breaks, replenish water and salt, and use a parasol and hat.
Please check the "Heatstroke Warning Alert" jointly announced by the Japan Meteorological Agency and the Ministry of the Environment, and consider changing your plans on the day it is announced.
Even if you spend your time indoors, please use your air conditioner appropriately, including at night.

Also, August is the month with the highest number of typhoons. Particularly in Okinawa and Amami, rainfall may increase due to the effects of typhoons, etc., so please check the latest information and prepare for disasters such as heavy rain.
Currently, Typhoon No. 13 is moving west-northwest near Wake Island with ferocious force. Around August 3rd, it is expected to move towards the waters near Ogasawara with very strong force. After that, depending on its path, it may approach areas from western Japan to the Nansei Islands. Please check the latest information.

Weather for tomorrow 31st (Friday) Beware of heavy rain and thunderstorms in Tohoku; extreme heat continues from Kanto to the west

2026/07/30 18:57

Tomorrow, the 31st (Friday), the weather will continue to be cloudy in northern Japan. The Tohoku region needs to be careful of localized heavy rain. The heat is likely to continue from eastern to western Japan.



There will be a lot of clouds all over Hokkaido, and there will be places where it will rain. It's safe to have rain gear when going out.
Tohoku will also have a lot of clouds, and there will be places with localized heavy rain and thunderstorms. There is a risk of heavy rain, so vigilance should be taken against landslides, flooding of low-lying areas, and rising and flooding rivers. Even on the Pacific side, there are places with showers, so please be careful of changes in the sky.

From eastern Japan to western Japan, many places will be covered in high pressure and will be sunny. Tomorrow is also likely to be dangerously hot, especially in inland areas. In Kumamoto Prefecture, which has been hit hard by earthquakes, heatstroke prevention measures are still essential, with forecasts of 37 degrees Celsius in Hitoyoshi City and 36 degrees Celsius in Kumamoto City. Those involved in recovery work should be careful of heat stroke.
In addition, it is expected to be an extremely hot day in various places, with Tokyo expected to be 36 C, Nagoya 38 C, Osaka 36 C, and Fukuoka 36 C. In inland areas, there are places where the heat approaches an extremely hot day, so vigilance is required.

[Life-threatening heat] Extreme heat of 40 degrees Celsius predicted for areas affected by the Kumamoto earthquake (Commentary: Weather forecaster Atsuko Miyake)

2026/07/30 15:09

The areas affected by the Kumamoto earthquake are expected to experience extremely hot days next week, with maximum temperatures exceeding 40 degrees Celsius.

While the power outage continues, some people are working on recovery efforts.
Please be extremely careful about heat stroke, such as staying hydrated frequently and working within reasonable limits.



Let's take a look at the expected maximum temperature in the weekly forecast.

The Kyushu region will continue to experience extremely hot days with temperatures exceeding 35c.
And on the 3rd (Monday), Saga and Kumamoto are expected to experience extreme heat of 40 degrees Celsius.
Neither Saga nor Kumamoto has ever experienced an extremely hot day with temperatures above 40c.

Let's take a look at the highest temperatures so far in the disaster area, Kumamoto.



The highest temperature so far in Kumamoto is 38.8c.

Statistics began in 1890, so this means that this will be the hottest day in over 130 years.



One of the causes of this heat is typhoons.

Typhoon No. 13 became a fierce force near Wake Island.

It is expected to continue moving westward with ferocious force.

The stronger this typhoon gets, the stronger the updrafts will be above the typhoon.
When the updraft strengthens, it hits the ceiling of the air, which intensifies the downdraft in the surrounding area.

As the typhoon strengthens, the high pressure system south of Kyushu strengthens,
causing intense heat around Kyushu.


From now on, the typhoon will continue to move slowly westward while maintaining its ferocious strength, so the
cyclone is expected to remain in the same position for a while.

For this reason, it looks like the intense heat will continue in Kyushu.



Looking at the weekly forecast, the Kyushu region will continue to be sunny and extremely hot.

The first half of next week will see plenty of sunshine, and the heat will continue to drain your physical strength.

A typhoon will approach in the second half of next week, and clouds will gradually increase.
I'm looking to see if there's a slight change in the weather here.

However, the intense heat is likely to continue, so please continue to be careful about heatstroke.

I hear that many people are sleeping in their cars.
If you are sleeping in your car, please take measures such as
parking it in the shade of a tree to prevent the car from overheating.
Please continue to take good care of yourself and do not overdo it.

[Typhoon No. 13 intensifies, Honshu experiences record heat] 40 degrees Celsius expected in Kumamoto (Commentary: Weather forecaster Atsuko Miyake)

2026/07/30 14:11

From now on, we need to be careful about the path of Typhoon No. 13 and the intense heat around Honshu.



Information on Typhoon No.13.
Typhoon No. 13 became a ferocious force.
It is located near Wake Island and is moving west-northwest at 20 km/h.

The central pressure is 910hPa and the maximum instantaneous wind speed is 80m.
This typhoon is expected to further drop its central pressure to 905 hPa by tomorrow (Saturday).
It is expected to maintain its fierce power until around the 2nd (Sunday).
After that, from the 3rd onwards, the central pressure will increase a little, becoming a very strong force, and the rank will drop by one.

However, there is still a risk that it will approach the Ogasawara Islands, where Chichijima and Hahajima are located, at around 925 hPa.

Chichijima and Hahajima are expected to experience heavy rain at the beginning of the week due to the effects of the typhoon.



Now, let's take a look at the rain and wind forecast for 3pm on the 4th (Tuesday).
The Ogasawara Islands include Chichijima to the north and Hahajima to the south.

According to current forecasts, this time period is when the center of the typhoon is closest.

A strong wind will blow in the Ogasawara Islands from the 3rd to the 4th, and there is a risk that the sea will become turbulent or violent.
Also, depending on the path, heavy rain may become a warning level.
Be prepared for strong winds, high waves, and heavy rain this Saturday and Sunday.
Be sure to put away items that are easily blown away.



And as for predictions of the future course,
still predictions vary considerably depending on each model.
This is the result of one predictive model.
This model predicts that the typhoon will develop again from next week onward and move westward.

Also, there is a possibility that it will move westward with a very strong force and approach the Nansei Islands and Kyushu region, so
Please continue to pay attention to the latest information.

As this typhoon develops, high pressure will become stronger near Honshu.
When the high pressure system strengthens, it becomes sunny and extremely hot.



Let's take a look at the latest weekly forecast.
It is predicted that western Japan will continue to experience extremely hot days of 35 degrees or higher, especially in eastern Japan.
It continues to be extremely hot, especially in western Japan.

And in Kumamoto, which was severely damaged by the recent earthquake, it is predicted that the 3rd (Monday) will be a very hot day with temperatures reaching 40 degrees Celsius.

Kumamoto's temperature of 38.8c is the highest ever recorded, so it will be the hottest day ever.
It looks like the heat will break all previous records.

If you are working on restoration work, please be extremely careful to avoid heat stroke.



, we will look at the weather in various places.
The intense heat and sunny weather will continue in western Japan and the Tokai region.
In the Kanto region, the extremely hot days with temperatures of 35c or higher are expected to continue until around the 2nd (Sunday), but
the clouds will spread more easily next week and the heat will subside a little.

In Hokuriku and northern Japan, rain will continue into the 1st (Saturday).
Especially in Niigata and the southern part of Tohoku, moist air will continue to flow in, and heavy rain is likely to continue.
Please be careful about how it rains from now on.

Next week, the Hokuriku and Tohoku regions are finally expected to be covered in high pressure and clear skies.
The rainy season is likely to end in Hokuriku and Tohoku as well.
The heat is coming again all of a sudden, so please be careful of heatstroke.

Typhoon No. 13 (Dolphin) is moving west-northwest with "violent" force

2026/07/30 08:07

As of 06:00 on the 30th, the ferocious typhoon No. 13 is moving west-northwest near Wake Island at a speed of approximately 20 kilometers per hour. The atmospheric pressure at the center of
is 920 hectopascals, the maximum wind speed near the center of
is 55 m, and the maximum instantaneous wind speed is 75 m.




It is expected to approach the Ogasawara Islands with very strong force on the 4th of next week, and there is a risk that it will have an impact on Japan even after that.
Please pay attention to the latest typhoon information.

Severe heat due to overhanging high pressure area - Warning of high temperatures of around 40c in the disaster area

2026/07/30 06:19

There is a high pressure system in the East China Sea and it is stagnant.
This high pressure system is expected to move slowly south-southwest over the East China Sea into tomorrow, and is expected to keep clear skies while covering a wide area.



Meanwhile, from the 30th to the 31st, the upper-level high pressure system centered near the Korean Peninsula is expected to strengthen its overhang toward western Japan.
Due to the influence of this upper-level high pressure system, the atmosphere in western Japan will be strong and stable, and the period of time when sufficient sunlight will reach the area will be extended.
As a result, temperatures are likely to be significantly higher than normal, leading to extremely hot days, especially in the Tokai region and western Japan.



Also, as the humidity remains high, it is expected that the perceived heat will increase even more than the temperature.
The risk of heatstroke will further increase as the temperature slows down at night, making it difficult to sleep at night in many regions.



Even in Kumamoto, the affected area, extreme heat is expected to reach around 40c until the 31st. People who are placed in unusual living environments, such as working outdoors or taking evacuation actions, need to be especially careful.
Please continue to take precautions against heatstroke, such as hydrating frequently, finding a place to rest, and using air conditioning appropriately, and continue to be even more vigilant in managing your health.