[Typhoon + Stagnant front = Prolonged heavy rain] Warning-level heavy rain likely to continue into next week (Commentary: Weather forecaster Atsuko Miyake)

2026/09/04 13:57

From now until next week, heavy rain is expected to continue for a long time due to slow-moving typhoons and fronts.

Please be careful of landslides and other disasters, and transportation may be affected, so please pay attention to the latest information.



This is the weather map from today's 4th (Friday) to tomorrow 5th (Saturday).

There is almost no movement of the front into tomorrow, the 5th (Saturday). The
front is expected to remain active as typhoons and tropical cyclones bring moist air from the south.

The pressure distribution of a typhoon in the south and a stationary front near Honshu is a typical pressure distribution pattern that will lead to heavy rain.
As this situation continues for a long time into next week,
there is a possibility that heavy rain will continue for a long time in similar places.



Rain clouds are forecast for tomorrow (Sat).

Rain clouds associated with the typhoon and front are expected to cover a wide area from the Nansei Islands to western and eastern Japan.
There are some areas where it rains very heavily, exceeding 50mm per hour, and
In western Japan, there are some places where it rains exceeding 80mm per hour.



It will continue to rain in similar places into tomorrow (Sat).

The front is expected to move southward a little tomorrow, but
there is a risk of continued heavy rain in Miyazaki Prefecture, where the humid air surrounding the typhoon flows,
as well as Kochi on the Pacific side of Shikoku, Wakayama and Mie Prefectures on the Kii Peninsula,
.

There is a possibility that a linear precipitation belt may occur, especially from Kyushu to Shikoku and the Amami region.
If a linear precipitation belt occurs, the risk of heavy rain disasters will increase immediately.



Let's take a look at the expected amount of rain.

The expected amount of rain by tomorrow (Saturday) morning is
300 mm in Shikoku and 250 mm in southern Kyushu.
After that, heavy rain of 100mm to 200mm is expected to continue into Monday.
The total amount for the past three days is expected to be 650 mm in Shikoku.
There is a risk that around twice as much rain will fall in a month at this time of year.

The effects of long-lasting heavy rains include landslides, river flooding, flooding of houses, and flooding of roads.
Also, please be aware of the impact on transportation such as Shinkansen and airplanes.



This is the weather in various places from now on.

On Saturdays and Sundays, rain marks will be noticeable mainly in western and eastern Japan.
There are likely to be some places where heavy or extremely heavy rain will fall, especially on the Pacific side.
Please be careful of heavy rain.

In areas west of the Tokai region, temperatures will rise to around 30c, and the hot and humid conditions will continue.
Even if it is not an extremely hot day, the humidity is high, so
Please continue to be careful of heat stroke.

In Hokkaido and Hokuriku, there will be many sunny days on Saturdays and Sundays
The temperature will rise to 28c in Sapporo on the 6th (Sunday).
The sun seems to be shining brightly.



From now on, the front will remain mostly stationary near Honshu into next week.
Warm, moist air continues to flow toward this front from the south.
As long as this situation continues, it will continue to be rainy.



Looking at the weekly forecast,
it will continue to rain around Honshu for a long time into next week.
In particular, there is a risk that warning-level heavy rain will continue for a long time until around the 9th (Wednesday).
Please continue to pay close attention to the latest information.

Typhoon No. 24's path becomes complicated around Okinawa; the autumn rain front stagnates near Honshu, prolonging the effects of heavy rain

2026/09/04 13:09

Today, the 4th (Friday), Typhoon No. 24 is moving northwest of Amami City. The typhoon is moving slowly, and the warm, humid air flowing around the typhoon is activating the autumn rain front that has stalled on the southern coast of Honshu.

#Typhoon No. 24 Friday the 4th, as of noon
==================
Center location Approximately 220km northwest of Amami City
Traveling speed north-northwest 10km/h
Central pressure 992hPa
Maximum wind speed 18m/s (near the center)
Maximum instantaneous wind speed 25m/s
==================



Typhoon No. 24 is expected to change its course to the south and take an easterly course around the 6th. It is moving in a complicated manner, moving counterclockwise around Okinawa and Amami, and the current forecast is that it will turn into a tropical cyclone in the south of Japan around the 8th.

In addition to the slow movement of the typhoon, the autumn rain front is expected to remain stationary near Honshu for some time to come. Additionally, there is another tropical cyclone in the south of Japan, which may move northward little by little.
As a result of these effects, warm, humid air will continue to flow toward the autumn rain front, and heavy rain is expected to continue from western Japan to the Pacific side of eastern Japan.



Also, just after noon today, Friday the 4th, the Japan Meteorological Agency announced the "Meteorological Disaster Prevention Bulletin (Linear Precipitation Zone Immediate Forecast)" for Miyazaki Prefecture. There is a risk that a linear precipitation band will form over the next three hours in the plains and mountainous areas of southern Miyazaki Prefecture, and very heavy rain will continue to fall in similar areas.
When a linear rain belt occurs, the risk of serious landslides, flooding, and river flooding that can be life-threatening increases rapidly.



Please continue to be extremely cautious of landslides caused by heavy rain, flooding of low-lying areas, and rising and flooding rivers.
Heavy rain will continue in the Pacific Ocean region from Kanto to southern Kyushu until around the 7th, and depending on the trends of the typhoon and front, there is a risk that the total amount of rainfall will increase further in the future.
Please pay attention to the latest weather information and typhoon information that will be updated in the future, as well as evacuation information announced by local governments.

Today's weather on the 4th (Friday): Due to Typhoon No. 24 and the autumn rain front, watch out for heavy rain in eastern and western Japan, Okinawa, and Amami.

2026/09/04 08:02

Today, the 4th (Friday), there is a risk of heavy rain in eastern to western Japan and Okinawa/Amami due to the influence of the autumn rain front that is stationary in eastern to western Japan and Typhoon No. 24 northwest of Amami City. There will be heavy rain in some places, accompanied by thunder. Please be careful of landslides, flooding of low-lying areas, and rising river waters.
In Shikoku, northern Kyushu, southern Kyushu, and Amami, linear precipitation bands may occur and the risk of heavy rain disasters may increase rapidly. Please pay attention to the latest disaster prevention weather information.



A low pressure system is located east of Hokkaido and is moving east. Additionally, a front is extending from the east of Japan to east and west Japan. Typhoon No. 24 is located northwest of Amami City and is moving north-northwest.

Currently, it is raining in Hokkaido, eastern and western Japan, and the Nansei Islands due to the effects of low pressure, fronts, and typhoons. In some areas, such as the Pacific coast of western Japan and the Amami region, active rain clouds are forming and the rain is becoming heavier. As of 7:30 a.m., a Level 3 heavy rain warning has been issued in Kochi Prefecture, Kagoshima Prefecture, and the Amami region, and a Level 4 landslide warning has been issued in the Amami region.



In Hokkaido, the low pressure will move away to the east and the weather will start to improve. Where it is currently raining, it is expected to stop by the afternoon.

Tohoku will be mostly sunny today as the front moves southward.

Rain is expected to continue in eastern and western Japan and the Nansei Islands. Atmospheric conditions are unstable due to the influence of warm, humid air from the typhoon itself and warm, humid air flowing toward the front. There will be heavy to very heavy rain in some places, accompanied by localized thunderstorms. In western Japan, heavy rain is expected to reach more than 80mm per hour in some places. Torrential rain is rain that feels so oppressive that it's hard to breathe, and that umbrellas are completely useless. Visibility is poor and driving is dangerous.
Please be careful of flooding of roads, flooding of low-lying land, landslides, and rising river waters. Also, please be aware that there is a risk of lightning strikes, tornadoes, and other strong wind gusts.

In Shikoku, northern Kyushu, southern Kyushu, and Amami, there is a risk that linear precipitation bands will form and the risk of heavy rain disasters will increase rapidly.
Please pay attention to the disaster prevention weather information that will be announced in stages. In addition, even if no evacuation information has been announced by the local government, please frequently check the risk level in your area using Kikikuru (risk distribution of landslides, inundations, and flood disasters) on the Japan Meteorological Agency website, and prepare for evacuation and make your own evacuation decisions.



The predicted maximum temperature will be higher than yesterday in many places in the Tohoku region, where there will be sunny days.
In other areas, there are many clouds blocking the sunlight, so it is unlikely that there will be a midsummer day with temperatures above 30c. However, due to the influence of humid air from typhoons, eastern and western Japan may feel hot and humid.
When indoors, please use the air conditioner appropriately and do not overdo it.

Possibility of "linear precipitation belt" occurring in Shikoku, northern Kyushu, southern Kyushu and Amami

2026/09/03 22:04

Today, the 3rd (Thursday), the Japan Meteorological Agency announced general weather commentary information (half-a-day forecast for linear precipitation bands) for the Shikoku region, northern Kyushu region (including Yamaguchi Prefecture), southern Kyushu and Amami regions, stating that the risk of heavy rain disasters may rapidly increase due to the formation of 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.

(Shikoku region)Kochi Prefecture From early morning to late night
(northern Kyushu(including Kuchi Prefecture)) Oita Prefecture From early morning to early night on the 4th
(southern Kyushu/Amami region) Miyazaki Prefecture From late night on the 3rd to late night on the 4th
(southern Kyushu/Amami region) Kagoshima Prefecture (excluding Amami region) From late night on the 3rd to late night on the 4th Kukake
(southern Kyushu/Amami region) Amami region From dawn to late night on the 4th



Typhoon No. 24 is currently approaching the Amami region, and after moving northwestward into tomorrow, the 4th (Friday), its movement will become complicated and it is expected to stall somewhere between south of Okinawa and south of Japan.
Also, the front passes through northern and eastern Japan, extending into the Kinki, Shikoku, and Kyushu regions. The front is expected to move slightly southward until tomorrow, the 4th (Friday), and then become mostly stationary.
The atmospheric conditions are unstable due to the warm and humid air from the typhoon itself and the warm and humid air flowing toward the front, with rain already falling over a wide area and localized areas with heavier rain.



After this, cumulonimbus clouds will develop locally in the Shikoku region, northern Kyushu region (including Yamaguchi prefecture), southern Kyushu and Amami regions, and very heavy rain accompanied by thunder or heavy rain will fall, leading to warning-level heavy rain.

Please be careful of landslides, flooding of low-lying areas, and rising and flooding rivers.
Also, please be aware that there is a risk of strong wind gusts such as lightning strikes and tornadoes.



Please further increase your preparedness for heavy rain and pay attention to the disaster prevention weather information that will be announced in stages. Also, please check the level of risk in your area using Kikikuru (risk distribution of landslides, inundation, and flood disasters) on the Japan Meteorological Agency website.

The autumn rain front is moving slowly southward near Honshu. There is a risk that heavy rain will continue for a long time due to Typhoon No. 24 and the autumn rain front.

2026/09/03 17:48

Today, the 3rd (Thursday), an autumn rain front extends near Honshu and is slowly moving south. A band of active rain clouds accompanying the front is passing from western Japan to eastern Japan.



The autumn rain front is expected to move southward over eastern and western Japan, and is expected to stay near the southern coast of Honshu from tomorrow 4th (Friday) to 5th (Saturday).



From tomorrow, the 4th (Friday), rainfall will increase from western Japan to eastern Japan, and there is a risk of extremely heavy rain accompanied by thunder, especially on the Pacific side of western Japan. Please be extremely cautious of landslides, flooding of low-lying areas, rising water levels and flooding of rivers, etc.



In addition, Typhoon No. 24 will approach Okinawa and Amami towards tomorrow, the 4th (Friday), and its movement will slow down after that. It makes complicated movements like spinning around at sea, and there is a risk of getting lost.

Typhoons and autumn rain fronts are typical heavy rain patterns. As Typhoon No. 24 slows down near Okinawa, the flow of warm, humid air is expected to continue for a long period of time, increasing the activity of the autumn rain front. Warning-level heavy rain is likely to continue across a wide area from Kyushu to Tohoku, and there is also a risk of intermittent heavy rain in the Kanto region.

Please continue to check weather information regularly.

Sea surface temperatures near Japan continue to be higher than normal in the northern part [Ocean summary (August 23 to August 29, 2026)]

2026/09/03 15:51

Sea surface temperatures in the seas around Japan continued to be higher than normal in the northern part of the country, and were significantly higher than normal in the northern and central Japan Sea, off the southeastern coast of Hokkaido, near the Kuril Islands, and in the Sea of Okhotsk, continuing from last week. In the waters around the Kuril Islands, the maximum temperature was 5 C above normal.

Due to Typhoon No. 18, wave heights of 4 to 6 meters occurred near the Nansei Islands from the 25th to the 27th.

Below is a summary of the ocean (August 23, 2026 - August 29, 2026)



During the period, Typhoon No. 18 moved westward from the waters near Ogasawara to the south of Japan, passed through the Nansei Islands, and headed toward Central China. Waves rose around the typhoon, reaching heights of 4 to 6 meters near the Nansei Islands from the 25th to the 27th. From the 25th to the 26th, waves continued to be high on the Pacific side, with wave heights of around 3 meters. From the 24th to the 25th, a low pressure system accompanied by a front moved northeast from Primorye to Sakhalin, causing waves to rise to a height of 3 meters in the southern Sea of Okhotsk on the 25th. From the 27th to the 28th, low pressure systems with cold air in the sky passed near Hokkaido one after another, causing waves to rise to a height of 3 meters west of Hokkaido on the 28th. During the period, the Japanese sea area, where the front was stationary, remained generally calm.



In the Japanese sea area, the sea area is significantly higher than normal. Temperatures in the central Japan Sea were up to 4 C higher than normal. Sea conditions in the East China Sea and the Nansei Islands continued to be slightly lower than normal as in the previous week. Temperatures off the coast of Shikoku and the Tokai region were at normal levels at the beginning of the period, but were slightly higher than normal towards the end of the period. The waters east of Kanto were slightly higher than normal, and the waters off Sanriku continued to be higher than normal. Sea areas off the southeastern coast of Hokkaido, around the Kuril Islands, and in the Sea of Okhotsk continue to be above normal, as they were last week. In the waters around the Kuril Islands, temperatures were up to 5 C higher than normal.

[Typhoon No. 24] Going around Okinawa - Possibility of long-term impact

2026/09/03 07:45

Typhoon No. 24 was located south of Minami Daito Island at 3:00 on the 3rd, and was moving north-northwest at a speed of approximately 20 kilometers per hour.
The atmospheric pressure at the center is 992 hectopascals, the maximum wind speed near the center is 18 m, the maximum instantaneous wind speed is 25 m, and strong winds of 15 m or more are blowing within a radius of 280 km from the center.

Also, a low pressure system accompanied by a front is moving east near the Oshima Peninsula in Hokkaido, and the front is extending to the Sea of Japan coast of the Tohoku region, off the coast of the Hokuriku region, and off the coast of the San'in region.



In the Tohoku and Hokuriku regions, there are places where localized heavy rain or extremely heavy rain is causing heavy rain.

Typhoon No. 24 will approach the Nansei Islands over the next 4 days, move north-northwest, and then move slowly.
The forecast is that it will circle counterclockwise around the main island of Okinawa until the 8th.



Meanwhile, the front is expected to move south from northern Japan to eastern and western Japan on the night of the 3rd, and will mostly remain near the southern coast of Honshu from the 4th to the 5th.

Warm, humid air moving north on the east side of the slow-moving typhoon will flow toward the front, and the atmospheric conditions will remain extremely unstable.
There is a risk that heavy to extremely heavy rain will continue to fall over a wide area, mainly from the Pacific side of western Japan to eastern Japan, into the 5th.



Depending on the path of the typhoon and the movement of the front, there is a possibility that heavy rain will continue even after the above period and the total rainfall will increase further. Please be careful of flooding in low-lying areas, rising and overflowing rivers, and landslides.

Also, due to the effects of the typhoon, you should be careful of strong winds and waves in the Okinawa and Amami regions.
[Wind forecast]

Maximum wind speed (maximum instantaneous wind speed) expected from the 3rd to the 5th
Amami region 18 meters (25 meters)
Okinawa region 17 meters (25 meters)

[Wave forecast]
Southern Kyushu 4 meters with swells
Amami region 5 meters with swells
Okinawa region 5 meters with swells

Please check the latest weather information and typhoon path forecast
.

Active rain clouds in Aomori Prefecture; level 4 landslide danger warning in the prefecture

2026/09/02 23:02

A low pressure system is located over the sea west of Hokkaido and is moving east-northeast. A front extends from this low pressure system toward the Tohoku region, and warm, humid air is flowing toward the low pressure system and front, making the atmospheric conditions in the Tohoku region extremely unstable.
Currently, there are active rain clouds around Aomori Prefecture, and there are places where it is raining heavily with thunder.



In Aomori Prefecture, a linear rain belt formed in the early hours of the 2nd today.
In Aomori Prefecture, the rainfall in the 24 hours up to 21:40 reached 231.0 mm, breaking the record for the highest amount in recorded history.

There is a high possibility that the ground has become loose due to previous rains, and a level 4 landslide warning has been issued for parts of Aomori Prefecture.
If you are near a dangerous slope or cliff, evacuate immediately.



The front will move southward over the Tohoku region through the night of the 3rd, and the cold air in the upper atmosphere will become stronger through the 4th, so the atmosphere is expected to remain extremely unstable.
Please be careful about landslides, and also be wary of flooding of low-lying land due to heavy rain, and rising water levels and flooding of rivers.

Please continue to pay attention to the latest weather information.

Atmosphere unstable due to front and typhoon; stormy weather over wide area over the weekend

2026/09/02 21:39

The atmospheric conditions near Japan are extremely unstable due to the effects of fronts and typhoons.
From around the 3rd (Thursday) to the 5th (Saturday), there is a risk of heavy rain and increased rainfall mainly from the Pacific side of western to eastern Japan.

A low pressure system is moving northeast near western Hokkaido, and a front extending from this low pressure system is reaching from southern Hokkaido, the Tohoku region, and the central Japan Sea to the vicinity of the Tsushima Strait.
An anticyclone is located far to the east of Japan, and its marginal flow extends to the south of Japan.



Typhoon No. 24 is near the Amami Islands and is slowly moving north.
In addition, Typhoon No. 18 has developed into a typhoon again in the South China Sea and is moving slowly east-northeast.

Southerly moist air currents blowing in from the east side of these typhoons and southerly winds from the distant high-pressure edge flow into the front area, resulting in a pressure distribution that continuously supplies warm, humid air near the front.

Tomorrow, the 3rd (Thursday), there will be a trough of atmospheric pressure near Japan, and convective clouds are expected to develop on the front from Hokkaido to Honshu.
There is a risk of heavy rain accompanied by thunder near the front, and there is a possibility of locally very heavy rain.



Because Typhoon No. 24 moves slowly, the inflow of humid air continues for a long period of time, making it difficult to resolve the unstable atmosphere.

The front is expected to stay near the southern coast of Honshu around the 5th, raising concerns about prolonged rain.
Please pay attention to the latest information regarding the movement of fronts and typhoons.



From around the 3rd to the 5th, there is a risk that heavy or extremely heavy rain will continue to fall over a wide area, mainly on the Pacific side of western to eastern Japan, and the total amount of rainfall will increase.
In areas where the ground has become loose due to heavy rain, even a small amount of rainfall can increase the risk of landslides. Depending on the path of the typhoon and the movement of the front, heavy rain may continue until around the 7th, and the total rainfall may even increase.



There is a risk of sudden rise in river water, flooding of low-lying areas, and a sudden increase in the risk of landslides. Avoid approaching dangerous areas, and if you live in a landslide warning area, please consider evacuating early.
Please pay close attention to the latest weather information and evacuation information from local governments.

[Typhoon information] Typhoon No. 24 (Krovan) is moving slowly, the autumn rain front is stationary near Honshu, and there is a risk of heavy rain over a wide area

2026/09/02 19:40

As of 6:00 pm on Wednesday the 2nd, Typhoon No. 24 (Krovan) is located approximately 280 km south of Minami Daito Island and is moving slowly north.

Typhoon No. 24 will continue to move northward, and is expected to move south of Amami City on the 3rd (Thursday) and north-northwest of Amami City on the 4th (Friday). After that, its movement will slow down, and it will most likely remain stationary from south of Kyushu to south of Japan.



#Typhoon No. 24 2nd (Wed) 6:00 pm
==================/brCenter location South Approximately 280 km
south of Daito Island Travel direction, speed North Slow
Central pressure 994 hPa
Maximum wind speed 18 m/s (near the center)
Maximum instantaneous wind speed 25m/s
==================

In the Nansei Islands, please be careful of landslides, flooding of low-lying areas, and rising water in rivers from around the 5th (Saturday), and be careful of strong winds and high waves accompanied by swells.



Also, there is a low pressure system with a front near northern Japan, which is moving east-northeast. After this, the front is expected to slowly move southward near Honshu on the 3rd (Thursday), and then come to a standstill near the southern coast of Honshu by the 4th (Friday).

The front will remain stationary, and warm, humid air moving north on the east side of the slow-moving typhoon will continue to flow toward the south of the front.
For this reason, from tomorrow 3rd (Thursday) to 5th (Saturday), heavy to extremely heavy rain will continue to fall over a wide area, mainly on the Pacific side of eastern and western Japan, and there is a risk that the total amount of precipitation will increase.
Depending on the path of the typhoon and the movement of the front, heavy rain may continue until around the 7th (Monday).

In eastern and western Japan, please be careful of landslides, flooding of low-lying areas, and rising river waters from the 3rd (Thursday) to the 7th (Monday).

Also, be careful of strong wind gusts such as lightning strikes and tornadoes. If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving inside a building. There is also a risk of hail, so please be careful when managing crops and agricultural facilities.

Please pay attention to future disaster prevention weather information and evacuation information from local governments. Also, please check the level of risk in your area using Kikikuru from the Japan Meteorological Agency website.