[Heavy rain in Nagoya area again tomorrow (Friday)] Peaks from early morning to commuting hours (Commentary: Weather forecaster Atsuko Miyake)

2026/09/10 14:42

In the Tokai region, the rain is expected to become heavier again, mainly in the morning tomorrow.
The ground has become quite loose due to the heavy rains so far, so
Please be careful and be on guard against landslides.



This is what the rain clouds looked like at noon today.
The rain clouds associated with the autumn rain front have temporarily moved away from Honshu.
In the Tohoku region, there are only rain clouds over the southern part of Mie Prefecture that can bring light rain, and in many other places it is drizzle or light rain.

The autumn rain front is expected to gradually move northward into tomorrow (Friday).
As moist air flows towards this front,
frontal activity is likely to increase somewhat.

Tomorrow (Friday), it looks like there will be heavy rain in some places in the Tokai region.



Rain cloud forecast.

Even in places where it is not raining right now, rain clouds are expected to gradually move northward after this.
It is expected to rain widely from the evening onwards.

There are very few places in the Tokai region where there will be heavy rain today (Thursday), but as the date changes to tomorrow (Friday), the rain will start to get heavier.

It looks like there will be an active path of rain clouds, especially from early morning until dawn tomorrow.
There is a risk of heavy rain in the Nagoya and Gifu areas.



And, during the commuting time, the area around Nagoya is expected to get heavier and the rain will reach its peak.
After this, there is a possibility that the rain clouds will stagnate at a similar point to 7:00 and 8:00.

If rain clouds form a line in a similar location, a linear rain belt may form.

Please check the rain clouds and surrounding conditions using the latest radar before going outside.

Active clouds are expected to pass over the Tokai region from 9 a.m. to noon.
Around noon, the rain will become heavier around Shizuoka Prefecture,
there is a risk of heavy rain in some cases.

At 3:00 p.m., active rain clouds will move to the eastern part of Shizuoka Prefecture, and the rain will stop in many places after the evening.

However, it has been raining quite heavily in the Tokai region so far,
causing the ground to become loose.



Even a little rain increases the risk of landslides, and the
Japan Meteorological Agency has also issued information that requires vigilance against landslides.

A [medium] warning has been announced for Shizuoka Prefecture, as there is a possibility that a landslide warning of level 3 or above will be issued.

Tonight and tomorrow, please spend your time at home in a safe place
on the second floor or above, away from the cliff.



Let's look at the weather in various places.
It will rain in many places from today evening until tomorrow.
Tomorrow (Friday), the rain will become stronger in the afternoon, and there is a risk of heavy rain.
Please be careful about how it rains.
Even when it rains, the temperature rises to around 26c.
It looks like the hot and humid weather will continue.



Weekly forecast.
The front is likely to remain stationary and the weather will continue to be cloudy and rainy.
Among these, the temperature will rise, and the 13th (Sunday) and 14th (Monday) are likely to be midsummer days with temperatures exceeding 30c.
It looks like it's going to get hot and humid, so please be careful of heat stroke.

[Heavy rain will affect tomorrow's commute to work] Tomorrow (Friday), the front will move north again, causing warning-level heavy rain (commentary: Weather forecaster Atsuko Miyake)

2026/09/10 14:19

It looks like there will be areas where warning-level heavy rain will occur again into tomorrow, the 11th (Friday).



Today, the rain clouds associated with the front have moved away over the sea to the south.
As of noon, there are many places on the Pacific side of western and eastern Japan with
light rain, drizzle, and drizzle.



Let's take a look at the forecast weather map for tonight and tomorrow night.
A front will remain stationary over the southern ocean into tonight.
The front is expected to move northward tomorrow, the 11th (Friday). Moist air is flowing towards the
front, and the
front is likely to become more active.

It is likely that there will be localized heavy rain again, mainly on the Pacific side of western and eastern Japan.



Rain cloud forecast.

After today's evening, rain clouds are expected to gradually move northward.
It is raining in many places on the Pacific side of western and eastern Japan, and the rain is likely to become heavier from night onwards.

Today, there are still few areas where heavy or heavy rain will occur, but when the date changes to tomorrow (Friday), active rain clouds are expected to cover the Shikoku region, the Kinki region,
and the Tokai region.

Furthermore, at dawn tomorrow around 6am,
a red line of rain clouds will be visible from Osaka to Nagoya.

Rain clouds that form a line and stagnant in the same area may form a
linear rain belt.



Let's look at the forecast at 7am.
A band of rain clouds is expected in similar places from Osaka to Nagoya, Gifu, and Nagano Prefecture.
Also, active rain clouds are expected in Mie and Wakayama prefectures.
There is a risk of locally heavy rain.

Tomorrow morning, heavy rain will reach its peak in some areas, mainly in the Kinki and Tokai regions, during commuter hours.

Before going out, please check the latest rain cloud conditions, and
check the surrounding conditions before heading out.

From tomorrow afternoon, active rain clouds will move to the east.
In the afternoon, active rain clouds will cover the northern Kanto region, but in the evening, the active clouds are expected to gradually move eastward.



There is a possibility of landslides in the Tokai region and Osaka prefecture, where active rain clouds continue to accumulate
, and a warning level has been announced.

The ground has become loose in many places due to heavy rain.
Especially if you live along a mountain or near a cliff,
please stay in a safe place on the second floor or higher, away from the cliff.



The weather in various places.
Even if it is not raining now on the Pacific side of western and eastern Japan, it will rain from today evening until around noon tomorrow.
In some cases, there is a risk of heavy rain accompanied by thunder.

In the area west of the Tokai region, the temperature is high and it gets quite humid.
It looks like it's going to be uncomfortably hot.
On the other hand, the temperature is low on the Pacific side from Kanto to Tohoku,
and it seems to feel quite cool.
Please be careful not to get sick due to the temperature difference.



Weekly forecast.
The front is likely to remain stationary near Honshu from now on.
Please continue to pay attention to the latest information.
From the weekend to the beginning of the week, there are some places in western and eastern Japan with midsummer days of over 30 degrees Celsius.
Please be careful of heat stroke.

Weather for today, the 10th (Thursday): Continued rain on the Pacific side of eastern and western Japan due to the influence of the autumn rain front; warning of landslides

2026/09/10 07:44

Today, the 10th (Thursday), the weather will be prone to rain on the Pacific side of eastern and western Japan due to the influence of the autumn rain front that will be stationary over the sea south of Honshu.
There are areas where the ground has become loose due to heavy rain, so please continue to be cautious of landslides.



The autumn rain front is extending over the southern sea of Honshu. There is a low pressure system near the Izu Islands on the front, and it is moving east-northeast. On the other hand, there is a center of high pressure in mainland China, which extends out into the Sea of Japan.

Currently, it is raining in some parts of Kanto, Tokai, and Kyushu.
As of 7:30 a.m., a level 4 landslide warning has been issued for the southern part of the Izu Islands. Please be extremely cautious of landslides until noon today, the 10th (Thursday).



Hokkaido will be covered in high pressure and will be sunny.

Tohoku to Kyushu, clouds will spread due to the influence of the autumn rain front mainly on the Pacific side, and there will be periods of rain.
In particular, rain will spread throughout the afternoon, especially from Kanto-Koshin to Tokai, Kinki, Shikoku, and southern Kyushu. Please bring rain gear with you.
In the Kanto and Tokai regions, there are areas where the ground has become loose due to previous heavy rains, and even a small amount of rain can increase the risk of landslides. Please stay away from dangerous slopes and cliffs.
Please continue to be cautious of landslides. Also, be careful of lightning, gusts of wind, and hail.

Although there are many clouds on the Sea of Japan side of Honshu, there are some places where the sun can reach.

Okinawa is mostly sunny, but please be careful of rain showers.

The predicted maximum temperature will be higher than yesterday in many areas with sunny days, such as Hokkaido and the Sea of Japan side of Honshu.
On the Pacific side of northern and eastern Japan, cold winds will blow from the northeast, and there will be places where the temperature will drop significantly compared to yesterday. Temperatures in Tokyo are expected to be 23 degrees Celsius, 9 degrees Celsius lower than in Japan, and similar to early October. It would be a good idea to have something long-sleeved to wear. Please dress appropriately to avoid getting sick due to the temperature difference.

Temperatures will drop significantly in the Kanto region tomorrow, the 10th (Thursday). From now on, there will be days when it returns to midsummer, so be careful of your health.

2026/09/09 23:02

The Kanto region will be on the north side of the autumn rain front tomorrow (Thursday), so the temperature will be significantly lower than today, and it will be as cool as autumn.

The highest temperature in Tokyo is expected to be 23c, which is 8c lower than today, and is expected to be similar to early October. The temperature is expected to be 22c tomorrow, the 11th (Friday).

Today, the 9th (Wednesday), the highest temperature in Tokyo was 31.3c, making it feel hot and humid. Tomorrow, the 10th (Thursday), the temperature will drop significantly and the wind will blow from the north, so it will probably feel a little chilly.
Please adjust your clothing wisely, such as wearing a layer of jacket, and take care not to get sick.

Other areas in the Kanto region are also expected to be cooler tomorrow, the 10th (Thursday) and the 11th (Friday).
However, it is expected that there will be midsummer days with temperatures above 30c from the weekend until the beginning of the week. As the autumn rain front moves northward, the hot and humid days are likely to return, so we will need to take precautions against heat stroke.



There will be a big difference in temperature over the next week, so please adjust your clothes appropriately. As people experience heat and cold differently, this is just a guideline, but if the temperature drops below 25c, you will need long sleeves. It's a good idea to have something to put on, such as a cardigan, so you can adjust it.
Please refer to the relationship between temperature and clothing.

Weather for tomorrow the 10th (Thursday): Rainy conditions will continue...

2026/09/09 17:56

The autumn rain front is expected to move southward to the Izu Islands. Rain is likely to fall mainly on the Pacific side of eastern and western Japan, but frontal activity is likely to weaken.



Rain is likely to fall mainly on the Pacific side of eastern and western Japan near the front. There are some places on the Sea of Japan side where the sun will reach in the morning, but there is a possibility of showers in the evening. It's safe to have an umbrella.
It will be a cloudy day in the Kanto region, with rain expected in the morning and evening. The temperature will be lower than today and it will feel cooler.
Hokkaido and the northern part of Tohoku will be covered in high pressure, and many areas will be sunny. The sun will be shining in the morning, and it looks like it will be a pleasant day. It gets cold in the inland in the morning, and there is a large temperature difference throughout the day, so please dress accordingly. It would be a good idea to have a folding umbrella in the southern Tohoku region.
Kyushu and north are on the north side of the front, so there are many places where the temperature does not reach 30c during the day, so you can feel autumn.

What is the cradle of typhoons, "Monsoon Gyre" Approaching the true nature of the huge vortex that creates typhoons one after another

2026/09/09 15:26

From August 13th to the early hours of August 14th, a linear precipitation band occurred in Chiba Prefecture, and Chiba City experienced record-breaking heavy rain with 24-hour precipitation reaching 351.0 mm.
About three weeks later, on September 5th, heavy rain was observed on Yakushima due to Typhoon No. 24, with 490.5 mm of rainfall in 24 hours.

The phenomenon known as ``monsoon gyre,'' which is secretly attracting attention in the meteorological industry with a great deal of alarm, is behind the continuous attack of linear precipitation belts caused by tropical cyclones and other forces.
It's not a word you're used to hearing, but this is an atmospheric vortex that could be called a "giant typhoon manufacturing factory."
We will explain in an easy-to-understand way what this thing is and how it affects our lives.

1. What is the true identity of "Monsoon Gyre"

A monsoon gyre is a super-massive cyclonic gyre with a diameter of 1,000 kilometers that appears from summer to autumn in the northwestern Pacific Ocean from Southeast Asia. The scale of these typhoons is an order of magnitude different from that of ordinary small cyclones and typhoons, and they can be several times the size of the Japanese archipelago. Its most distinctive feature is that it is not just a mass of rain clouds, but rather acts as a cradle for producing typhoons one after another. Moist air is violently stirred up in this gigantic vortex, making it easy for abnormal situations such as one typhoon to disappear, but another typhoon or tropical cyclone to form one after another right next to or behind it.



2. Why is the monsoon gyre a threat

When the monsoon gyre occurs, it has a troubling impact on our lives and weather.
Just when one typhoon approaches and makes landfall in Japan and we feel relieved that it has finally passed, there are many cases where a second or third typhoon arrives following a similar course.
This will hinder recovery efforts in the affected areas and increase the risk of long-term heavy rain disasters. In addition, when the Autumn rain front that is stationary near Japan and the warm, humid air around the edge of the monsoon gyre merge, the frontal activity increases explosively. Even if the typhoon itself does not directly hit, linear precipitation bands can form in faraway places, causing heavy rain.
It may be still fresh in your memory that a tropical cyclone south of Shikoku created a linear precipitation belt in the Tokai region, and heavy rain of 104.5 mm per hour was recorded in Nagoya, Aichi Prefecture.
Another aspect is the prolonged period of unseasonable weather. Because the entire sky is completely covered by a huge vortex, cloudy and rainy days tend to last for days or even weeks. There are also concerns about the lack of sunlight and its associated impact on the prices of agricultural products such as vegetables.

3.How should we respond to the monsoon gyre

The term monsoon gyre itself may not appear directly in weather forecasts, but when the news explains that ``moist air from the south will continue to flow in for a long period of time,'' it is a sign that this huge vortex is lurking in the background. The best way to protect yourself in the upcoming season is to not let your guard down based on just one typhoon information, but to be aware of long-term preparations that look several days ahead, such as whether there are reserves for subsequent typhoons or whether there is a risk of disaster due to a long period of rain.

[Breaking News] Level 4 flood danger warning has been announced for the Hida River in the Kiso River system. The basin is on high alert for river flooding and landslides.

2026/09/09 11:40

Due to heavy rain, the Hida River in the Kiso River system in Gifu Prefecture has risen, and a Level 4 flood warning has been issued.



The flood level reached the Gero standard observation station on the Hida River, and if flooding occurs, there is a risk of flooding in areas such as Gero City, a basin municipality.

Please ensure your own safety by never going near rivers and moving to an upper floor that is less likely to be flooded.



Today, the 9th (Wednesday), record heavy rain has been occurring in the Tokai region since yesterday due to the influence of the autumn rain front and low pressure. Active rain clouds are still hanging over the basin intermittently, and the amount of rain in the area is increasing today. The area around
is not only at high risk of flooding due to heavy rain, but also the risk of landslides occurring is extremely high.

If you live in areas where there is a risk of landslides, such as near cliffs or rivers, please try to evacuate early and pay attention to information such as evacuation advisories announced by municipalities.

9th (Wednesday): Possibility of linear precipitation bands in Tokai, Kinki, and Shikoku; very heavy rain over a wide area.

2026/09/09 07:55

Please be extremely cautious of landslides, especially from western Japan to eastern Japan, and be wary of inundation of low-lying land, rising water levels, and flooding of rivers. In the Tokai, Kinki, and Shikoku regions, there is a risk that linear precipitation bands will form and the risk of heavy rain disasters will rapidly increase. In addition, there is a risk of heavy rain in the Kanto-Koshin region at night.

A front is extending from western Japan to eastern Japan, passing through the Pacific side of eastern Japan. Furthermore, a tropical cyclone that has changed from Typhoon No. 24 is heading north in the south of Shikoku, and as warm, humid air flows into the front from the east, the front becomes more active, causing heavy rain to fall in some places. The tropical cyclone is expected to turn into a frontal cyclone on the Pacific side of western Japan, and frontal activity is expected to remain active into the 10th (Thursday).



As a result, very heavy rain and thunderstorms are expected to fall over a wide area from western Japan to the Tohoku region, resulting in heavy rainfall. In particular, heavy rain will continue from the Pacific side of western Japan to eastern Japan into the 10th, potentially increasing the total amount of rainfall. The Japan Meteorological Agency has announced a half-day-a-day forecast for linear precipitation bands.




The following are the regions and periods where linear precipitation bands may occur and the risk of heavy rain disasters may rapidly increase.



Please be extremely cautious of flooding of low-lying land, rising water levels and flooding of rivers. Caution and vigilance are also required for landslides, flooding of low-lying land, and rising river waters.

Please pay close attention to changes in weather conditions, such as frequently checking the latest information.

Large wave height of over 6m around Typhoon No. 24 [Marine Summary (August 30th to September 5th, 2026)]

2026/09/09 06:57

Throughout the period, the autumn rain front remained stationary near Honshu. Typhoon No. 24 took a counterclockwise circular path near Okinawa and affected the Nansei Islands for a long period of time.

Below is a summary of the ocean (August 30th to September 5th, 2026)



#Pressure distribution and waves
Autumn rain front is stationary near Honshu. From the 30th to the 31st, a low pressure system moved southeast off the coast of Sanriku, with wave heights of around 3 meters in the vicinity. A tropical cyclone off the coast of Sanriku moves northward south of Japan. Wave height is 3m near the low pressure area. On the 1st, the tropical cyclone developed into Typhoon No. 24. Wave height was around 3m near the center of the typhoon and the Nansei Islands on the north side of the typhoon. For the next 2-3 days, the typhoon slowed down and stalled near the Nansei Islands. Waves in the vicinity of the Nansei Islands had a wave height of more than 6 meters. On the 4th, Typhoon No. 24 moved slowly northward, with wave heights of over 4 meters from the south of Kyushu to the Tsushima Strait. On the 5th, Typhoon No. 24 moved into the East China Sea, with wave heights of over 6 meters near the center and over 2 meters on the southern coast of Honshu.



#Sea surface temperature
In the Japanese sea area, areas where the sea surface temperature is higher than normal are shrinking. In the East China Sea and the Nansei Islands, areas slightly lower than normal have shrunk. Continuing from the previous week, waters off the coast of Shikoku and the Tokai region continued to be slightly higher than normal. To the east of Kanto, the sea level was slightly higher than normal, and off the coast of Sanriku, areas appeared to be at normal levels. Sea areas significantly higher than normal were no longer observed off the southeastern coast of Hokkaido, near the Kuril Islands, and in the Sea of Okhotsk, but sea areas that were higher than normal continued. In the waters around the Kuril Islands, the areas above normal have shrunk, and areas below normal can now be seen.

Level 4 flood risk information in Tokyo - Situation requiring evacuation on rivers in Tokyo

2026/09/08 22:30

There are currently very active rain clouds over the western part of Tokyo and the eastern part of the Tama region. Level 4 flood risk information has been announced for the Shakujii River, Zenpukuji River, Nogawa River, and Sengawa River that flow through Tokyo.



The front is extending from western Japan through the Pacific side of eastern Japan to the east of Japan. Additionally, a tropical cyclone that has changed from Typhoon No. 24 is heading north from the south of Shikoku. To the east, warm, humid air is flowing toward the front, and the front is active, causing heavy rain in some places.



Level 4 is the "evacuate everyone from dangerous areas" stage. If you are in an area that is expected to be inundated by river flooding, please evacuate immediately.

The front is expected to remain active from Tohoku to Western Japan until the 10th.
Please pay attention to information from your local government and the latest risk distribution from the Japan Meteorological Agency's Kikikuru.