Beware and beware of heavy rain with lightning over a wide area. Linear precipitation zones may occur in Hokkaido.

2025/09/13 17:29

There is a low pressure system in the Sea of Japan, and it travels northeast, with the front passing through the Tohoku region and the Sea of Japan and the Korean Peninsula to the Yellow Sea.
Currently, warm and humid air has flowed into the front line in the vicinity of Japan, and from north to western Japan, the atmosphere is extremely unstable and extremely heavy rainfall with lightning.

As the low pressure system develops, it is expected to pass through the Hokkaido region tomorrow, Sunday the 14th, and the front will extend to the area around Honshu on the 14th.
In Northern Japan and Western Japan, the atmosphere is expected to remain extremely unstable due to the effects of low pressure and warm, humid air heading towards the front from tomorrow, the 14th.



In the Hokkaido region, linear precipitation zones can occur from the beginning of the night of the 13th to the dawn of the 14th, causing the risk of heavy rain disasters to rise dramatically.
Please be very careful of landslides, flooding of low land, flooding of rivers and flooding.
Also, from the 14th in northern Japan to western Japan, be careful of heavy rain, and be careful of severe gusts of wind, such as lightning strikes and tornadoes, and hail fall.





###Rain forecast
In the north to western Japan, there will be very heavy rainfall from the 14th, with some areas causing heavy rain.
There are some areas where the ground has been loosened due to rainfall so even small amounts of rain can increase the risk of landslides.

The expected one-hour precipitation from the 13th to the 14th is high, with
Hokkaido, northern part of the Sea of Japan side of 50mm.
Hokkaido, southern part of the Sea of Japan side: 50mm.
Hokkaido, western Pacific side: 50mm.
Hokkaido, Eastern Pacific Ocean: 30mm.
Hokkaido, Northern part of the Sea of Okhotsk side: 40mm.
Hokkaido, southern part of the Sea of Okhotsk side 40mm.
Tohoku: Sea of Japan Side: 50mm.
Tohoku Pacific side 40mm.
Northern Kanto 20mm.
Southern Kanto: 30mm.
Koshin: 30mm.
Hokuriku: 50mm.
Tokai: 50mm.
Northern Kyushu: 50mm.

The 24-hour precipitation expected from 6pm on the 13th to 6pm on the 14th is high, with Hokkaido, northern part of the Sea of Japan side of the country 150mm.
Hokkaido, southern part of the Sea of Japan side: 180mm.
Hokkaido, western Pacific side: 180mm.
Hokkaido, Eastern Pacific Ocean: 100mm.
Hokkaido, Northern part of the Sea of Okhotsk side, 120mm.
Hokkaido, southern part of the Sea of Okhotsk side, 120mm.
Tohoku: Sea of Japan Side: 150mm.
Tohoku Pacific side 80mm.
Northern Kanto: 50mm.
Minami Kanto: 50mm.
Koshin 60mm.
Hokuriku: 120mm.
Tokai 120mm.
Northern Kyushu: 120mm.


If a linear precipitation occurs, there is a risk that the rainfall will increase locally even further.
The following are the areas and periods where linear precipitation zones can cause a sudden increase in the risk of heavy rain disasters.
Oshima/Hiyama region From the beginning of the evening of the 13th to the early hours of the 14th.
Ishikari, Sorachi, and Shimoshi regions, Iburi and Hidaka regions from late at night on the 13th to early dawn on the 14th.

###Wind forecast
Maximum wind speed expected from the 13th to the 14th (maximum instantaneous wind speed)
Hokkaido, Northern land on the Sea of Japan side: 20 meters (35 meters).
Hokkaido: Northern sea on the Sea of Japan side: 23 meters (35 meters).
Hokkaido, southern land on the Sea of Japan side: 18 meters (30 meters).
Hokkaido, southern seaside on the Sea of Japan side 20 meters (30 meters).
Hokkaido: Western Pacific Side Land and Field: 16 meters (30 meters).
Hokkaido: Western Pacific Ocean: 20 meters (30 meters).
Hokkaido, Eastern Pacific Side Land and Field: 16 meters (30 meters).
Hokkaido, Eastern Pacific Ocean side sea: 23 meters (35 meters).
Hokkaido, 20 meters (35 meters) on the northern side of the Sea of Okhotsk side.
Hokkaido, 23 meters (35 meters) above the sea on the northern side of the Sea of Okhotsk.
Hokkaido, 16 meters (30 meters) on the southern side of the Sea of Okhotsk side.
Hokkaido, southern seaside on the Sea of Okhotsk side, 23 meters (35 meters).

###Disaster Prevention Issues
In the Hokkaido region, be careful of landslides, flooding of low land, rising rivers and overflowing on the 14th.
Please be careful and be careful of heavy rain in northern Japan and western Japan from the 14th.
Also, be careful of severe gusts of winds such as lightning strikes and tornadoes in northern and western Japan from the 14th.
If there are signs of developing cumulonimbus clouds approaching, try to ensure safety by moving inside the building.
There is a risk of hail falling, so please be careful when managing agricultural crops and agricultural facilities.

Typhoon No. 15 lands near Sukumo City, Kochi Prefecture; linear precipitation zones occurred in Miyazaki, Shizuoka, and Kanagawa prefectures, as well as tornadoes occur in Makinohara City, Shizuoka Prefecture and other areas (weather summary August 31st to September 6th, 2025)

2025/09/13 08:01

On September 4th, Typhoon No. 15 broke out in the waters near the Nansei Islands, and landed near Sukumo City, Kochi Prefecture in the early hours of the 5th. Typhoon No. 15 caused linear precipitation in Miyazaki, Shizuoka and Kanagawa prefectures, as well as gusts of wind that are considered to be tornadoes in Shizuoka and Ibaraki prefectures. According to a later investigation by the Japan Meteorological Agency, the tornado that occurred from Makinohara City, Shizuoka Prefecture to Ohata, Yoshida Town, was estimated to have reached an estimated wind speed of approximately 75 m/s, causing damage such as collapse of electric poles and total and half-destruction of over 1,000 homes.

Below is a summary of the weather for the current period (August 31st to September 6th).

#Summary of weather for this period (August 31st to September 6th)
Average temperatures have been much higher than normal nationwide due to low pressure and warm air flowing towards the front. In western and eastern Japan, the heat has continued throughout the country even in September, with many places exceeding 3 degrees Celsius or more than normal.

Precision amounts have been significantly higher than normal in the Pacific Ocean side of eastern Japan, from Akita, which had heavy rain due to the effects of fronts, and western Japan, which had heavy rain due to Typhoon No. 15. In Akita, Tokyo and Osaka, the amount of rainfall recorded more than twice the average year, and in Miyazaki, where a linear precipitation zone occurred, the amount of rainfall exceeded more than four times the average year.

Sunday hours were often sunny in western Japan, eastern Japan, Okinawa and Amami, where high pressure was likely to be covered by high pressure, making it more sunlight than usual. In particular, in Hokuriku, sunlight was much higher than usual in Niigata and Kanazawa. Meanwhile, Hokkaido was easily affected by low pressure and front lines, causing sunshine to fall below normal in Asahikawa and Abashiri.



[About the weather during this period]
#Characteristics of the atmospheric pressure system
On the 31st, the high pressure system, which is centered on the south of Japan, stagnated mostly. The front line near the Korean Peninsula gradually approaches northern Japan from China. On the 1st, a low pressure system appeared on the front in the central Japan Sea, and as it developed it approached the area around Hokkaido. Another low pressure system appeared on the front late at night near the Korean Peninsula. On the 2nd, the front line stagnated from the east of the Kurishima Island to the Sea of Japan to Hanachu, and two low-pressure pressure systems on the front line moved eastward. A new tropical cyclone emerges in the south of Okinawa. On the 3rd, the front gradually moved south from Tohoku to the area near Hokuriku, and from the continent, a mobile high pressure system advanced to the Sea of Japan. A tropical cyclone continued to move north in the south of Okinawa, and developed as Typhoon No. 15 around the early hours of the 4th. Typhoon No. 15 headed north near the Bungo Waterway on the 4th, and landed near Sukumo City, Kochi Prefecture in the early hours of the 5th. On the 5th, Typhoon No. 15 proceeded eastward along the southern coast of Honshu, and the front stagnated from Hokuriku to the south of Tohoku. Late on the 5th, Typhoon No. 15 transformed into a temperate cyclone over the Tokai region of Kanto. On the 6th, the area around Honshu was widely covered by mobile high pressure.

#Precture
On the 31st, high pressure was covered in the area around Honshu, but locally heavy rain was observed in Kyushu. On the 1st, heavy rain occurred in Hokkaido due to the influence of the front line, and the rain was heavily in Toi Tomari, Hakodate City, with a rainfall of 102mm per hour. On the 2nd, heavy rain began in Hokkaido, Tohoku, Hokuriku, and Sanin due to the effects of the warm, humid air heading towards the front. In Kitaakita City, daily rainfall was recorded at Hitari and Wakigami. On the 3rd, there was extremely heavy rain in Tohoku and Hokuriku due to the influence of the southbound front. In the Kanto region, rain clouds have suddenly developed due to warm and humid air and rising temperatures during the day, and record-breaking information on heavy rain has been announced in Ibaraki and Tochigi prefectures. On the 4th, heavy rain occurred in Kyushu and Shikoku due to the effects of Typhoon No. 15, and a linear precipitation zone occurred in Miyazaki Prefecture. Heavy rain was also occurring in the Kanto region, far from the typhoon, and record-breaking short-term heavy rain information was released in Chiba Prefecture and Tokyo. On the 5th, heavy rain occurred on the western and eastern Pacific sides of Japan due to the effects of Typhoon No. 15. Linear precipitation zones occurred in Shizuoka and Kanagawa prefectures. In addition, severe gusts of wind that were believed to be a tornado occurred in Makinohara City, Shizuoka Prefecture and Omika Town, Hitachi City, Ibaraki Prefecture due to the effects of Typhoon No. 15.

#Temperature
On the 31st, the area around Honshu is within the high pressure zone, and the heat is especially severe in the Tokai region. Nagoya has observed 40.0 C for the second time since statistics began. On the 1st, western and eastern Japan were covered by a wide range of high pressures, and temperatures rose due to strong sunlight. In Toyama, the temperature was high due to the Fohn phenomenon, causing a severe hot day of 38.0 C. On the 2nd, the temperatures increased inland areas of Kanto. The temperature was observed at 39.8 C in Hatoyama, Saitama Prefecture, and the number one value for September was updated. On the 3rd, temperatures rose, mainly in the western and eastern Pacific sides, and many hot spots began to rise. It was a severe 38.5c in Katsunuma, Koshu City, Yamanashi Prefecture, and Nagoya (37.5c) was a 20th consecutive day of extreme heat. On the 4th, the extreme heat in western and eastern Japan was subsided due to the effects of rain, with the highest temperature in Tokyo remaining at 28.7c and 32.8c in Nagoya. Sakaiminato City, Tottori Prefecture (35.0c), recorded the only day of the day's extreme heat. On the 5th, Typhoon No. 15 left in Kyushu and Shikoku, and the sun was restored, causing extreme heat in Miyazaki (36.4c) and Kochi (36.2c). On the 6th, a typhoon passed, and sunlight reached various places, causing temperatures to rise, mainly in western Japan. Yamaguchi recorded a temperature of 36.9 C, breaking the top spot in September.

First day of the three-day holiday: Starting with cloudy and rainy weather over a wide area; Hokkaido may have a rough weather late at night

2025/09/13 07:34

Today, the first day of the three-day holiday, the 13th (Saturday), will be moving along the Sea of Japan as a cyclone on the front develops. The center of high pressure is located in the south of Japan, and warm, humid air around the edge of high pressure flows towards the front, making rain clouds more likely to develop, causing cloudy and rainy weather from southern Tohoku to Kyushu. The temperatures from Kanto to west are high and humid, and it is likely that in western Japan, there will be many areas around 33 C.



From western Japan to southern Tohoku, rain clouds have developed due to the effects of the warm, humid air heading towards the front, and some areas have been raining since the morning. The atmosphere will continue to be unstable, with rain and halting weather. It is expected to cause heavy localized rain, and be careful of road flooding and river flooding.
In the Tokai region, it was believed that about 120mm of heavy rain fell near Yokkaichi City, Mie Prefecture last night, and record-breaking rain information was released. In Mie Prefecture, the ground has been loosened due to the heavy rain so even if there is a slight rain, beware of landslides.



In northern Japan, the rain area will gradually expand as a frontal low pressure system develops. On the Sea of Japan side of Hokkaido and northeastern Tohoku, there are expected to be some areas with extremely heavy rainfall with thunder tonight, and the winds will be strong, especially around the coast, causing rough weather. The later in the night, the more vigilant you need to be aware of the harsh weather, and be careful of high waves on the coast.

Latest month forecast: The harsh summer heat continues in late September, and the seasons progress slowly

2025/09/12 20:41

On the 11th, the Japan Meteorological Agency announced the latest one-month forecast, which will provide an estimate of the weather for the next month.



According to predictions made by the Japan Meteorological Agency's numerical forecast model, high pressure forces are strongly predicted in the East Sea and mainland China. The area around Japan will become a valley of atmospheric pressure sandwiched between two high pressures, and it is expected that it will be susceptible to low pressure and front lines. The temperatures around 1,500m above the sky are still warmer than normal nationwide, and the seasons ahead are likely to progress slowly.



On the 12th, the Japan Meteorological Agency announced "General Weather Information on High Temperatures." As the days will likely continue to be covered by high pressure and warm air from now on, the temperatures will continue to remain high in eastern Japan from September 14th to 18th, western Japan from the 15th to 17th, and Okinawa and Amami from the 16th. It is expected that some areas will have a hot day with a maximum temperature of 35 C or higher in eastern and western Japan, and there are also areas with a maximum temperature of 33 C or higher in Okinawa and Amami. The temperatures will likely continue to be higher than normal by the end of September, so please continue to be careful about your health management, such as heat stroke.



The weather ahead will likely change cyclically, as is typical of this time of year. Low and high pressure systems are expected to pass alternately around Japan, and in northern Japan, it is likely to be affected by low pressure and front lines, with more rainfall than normal. It is expected that on the Sea of Japan side of eastern and western Japan, there will be more sunny days covered by high pressure.
Precision in eastern and western Japan is expected to be on par with normal years. However, when the autumn rain front stagnates and is affected by cold or humid air above, localized heavy rain, such as guerrilla thunderstorms, can occur. You need to be careful when it rains. Also, since typhoons are easily accessible to the area around Honshu, if a typhoon forecast is announced, make sure to check the latest information carefully.

[Beware of rough weather during the holidays] The first half of the holidays will lead to heavy rain and strong winds in the north, and the last day will be revived as the hot weather will return.

2025/09/12 12:24

Some people may have a three-day holiday starting tomorrow, the 13th (Saturday), but
The atmosphere conditions will remain unstable during this holiday, and the weather will likely be rougher in the north.


If you are out or travel far during the holidays, you must be careful and be careful of heavy rain and strong winds.



This is a forecast weather map during the holidays.

Tomorrow, Saturday the 13th, the low pressure system will develop and move northeasterly through the Sea of Japan, and the cold front extending from the low pressure system will move south through
Honshu through Sunday the 14th.


On the last day of the holiday, the 15th (Monday, Respect for the Aged Day), frontal activities are expected to weaken near Honshu, but
The front of the West Japan Sea of Japan will stagnate.


In particular, the weather is more likely to be rough in the first half of the holidays, and in areas on the Sea of Japan where low pressure and fronts approach, there is a risk of heavy rain and storms at the level of an alarm level.




Let's take a look at the rain and wind predictions for tomorrow, the 13th (Saturday).


As a result of low pressure and warm, humid air heading towards the front, air conditions are expected to become unstable nationwide.


There is a risk of heavy rain with thunder everywhere from Kyushu to Hokkaido.


In particular, in the Tokai region, where moist air flows directly, extremely heavy rain is expected to fall, with a large amount of rain.


Please be careful of the latest traffic information as this may affect transportation such as bullet trains and highways.



In addition, winds will be strengthened nationwide and low pressure will approach
In Hokkaido, there is a possibility of an alarm-level storm, mainly on Sunday the 14th.
It may affect the operation of aircraft and other aircraft.

In the first half of the holiday, from Saturday the 13th to Sunday the 14th, beware of low land flooding due to heavy rain, landslides, and river flooding, and in Hokkaido, beware of strong winds.




/Heavy rain warnings may be issued in Northern Japan, Tokai and Kinki on Saturday the 13th, and in Northern Japan and the Sea of Japan side on Sunday the 14th.

In Hokkaido, there is a possibility that an alarm-level storm will occur on Sunday the 14th.


The range may expand depending on the level of development and trends of the low pressure system, so please check the latest information during the holidays.



On the last day of the holiday, the 15th (Monday, Respect for the Aged Day), it is expected to be 35 C in Tokyo, Osaka, Takamatsu, and other places, and 36 C in Nagoya, so there will be some places where the extremely hot days will return.

However, after extensive rain falls mid-near week, there will be fewer hot days, and
We will finally be able to feel the signs of autumn.

The atmosphere is extremely unstable from western to eastern Japan; Chugoku region is being wary of heavy rain disasters

2025/09/12 06:54

The front is stagnant from western Japan to the Pacific Ocean side of the eastern Japan. Additionally, a valley of atmospheric pressure with cold air above it passes through eastern Japan, causing unstable air conditions. Rain clouds are developing locally from western Japan to eastern Japan, and heavy rain of 32.5mm was observed in Hiroshima City, Hiroshima Prefecture during the hour until 5:31am. As of 6:15, there are areas in Hiroshima Prefecture where landslide warning information has been issued.


In the future, in eastern and western Japan, the atmosphere conditions are expected to continue to be extremely unstable today, the 12th (Friday), due to the effects of warm, humid air and cold air above.




[Rain Prediction]
In eastern and western Japan, heavy rain and very heavy rain will fall today, the 12th, and there will be heavy rain.

#Expected amount of rain (in places where it is high)
+24-hour precipitation expected by 6:00 tomorrow, the 13th
/B: Kanto-Koshin region: 60mm
/B: Tokai region: 200mm
/B: Kinki region: 80mm
/B: Chugoku region: 100mm

/B: [Disaster Prevention]
: In the Chugoku region, today, Friday the 12th, please be very careful of landslides, flooding of low land, rising rivers and flooding. In eastern and western Japan, today, Friday the 12th, beware and beware of landslides, flooding of low lands, and rising rivers.
Also, be careful of severe gusts of wind, such as lightning strikes and tornadoes. If there are signs of developing cumulonimbus clouds approaching, try to ensure safety by moving inside the building. There is a risk of falling hail, so be careful about managing agricultural crops and agricultural facilities.

Weather today, Friday the 12th: Unstable atmospheric conditions. Beware of sudden thunderstorms in western Japan and eastern Japan

2025/09/12 06:11

Today, the 12th (Friday), the autumn rain front is expected to gradually move southward around Honshu. There are many clouds in Eastern to Western Japan, so you need to be careful of sudden thunderstorms.



Even though humid air is affected from southern Tohoku to western Japan, the atmosphere will become unstable. Clouds are likely to spread everywhere, and there is a risk of sudden thunderstorms, so it's safe to have a folding umbrella or other rain gear in places where it's not raining when you go out.

/BOn the other hand, Hokkaido and northern Tohoku are likely to be covered in high pressure and mild weather. It will be a refreshing and comfortable daytime atmosphere. The temperature difference between morning and evening will be large, so please be careful of the temperature difference.

Typhoon No. 15: A swell of south-eastern Japan's sea surface temperature is higher than normal to normal [Summary of the ocean (August 31 - September 6, 2025)]

2025/09/11 15:35

Due to the influence of Typhoon No. 15, Japan's south to east are swelling, and the sea surface temperature has risen from a higher than normal to a normal level.
The sea surface temperature in the Sea of Japan continued to be much higher than normal, and
May be up to 5 C.
Below is a summary of the oceans (August 31st to September 6th, 2025)



#Atmospheric configuration and waves
On the 2nd, the front extended from the continent through the Sea of Japan and north Japan to the east of the Kuril Islands.
The low pressures in the Sea of Japan and the coastal waters near the Kuril Islands on the front line have moved eastward.
Waves have risen slightly in the centre of the Japan Sea and the east of Kuril Islands, surrounding the front.
On the 3rd, a tropical cyclone headed northward across Japan, and developed to Typhoon No. 15 in the east of Amami Oshima at 3am on the 4th.
On the 4th, it hit the ground near the typhoon.
The typhoon landed in Kochi Prefecture around 1am on the 5th.
After that, it moved eastward along the Pacific coast of the West to the East Japan coast, and at 9pm it transformed into a temperate cyclone in the east of Japan.
It was accompanied by a swell in the south of Shikoku to the east of Kanto.
On the 6th, the waves rose widely in the east of Japan in the area around a temperate cyclone.



#Sea surface temperature
The sea surface temperature in the Japanese Sea continued to be significantly higher than normal.
In particular, on the central and western continental sides, the temperature was up to 5 C.
In the East China Sea, higher than normal waters have expanded.
The Nansei Islands are also slightly higher than normal.
The Pacific side was higher than normal, with a maximum of 3 C higher, but with the passing of Typhoon No. 15, the waters gradually expanded to be as normal.
The waters off Sanriku continued to be much higher than normal.
Continuing, it was lower than normal in the south of the Kuril Island waters, and in the southern Sea of Okhotsk, it was on average.

[Thunder clouds are developing] Massive rain observed in Setagaya in central Tokyo; time to return home may affect transportation

2025/09/11 15:35

As of 3:00 pm today, Wednesday the 10th, the front is moving south through the Kanto region.


Rain clouds and thunder clouds that have developed in particular in central Tokyo are continuing to be exposed to the rain clouds and in Setagaya Ward, Tokyo, we observed a fierce rain of 92.0 mm in the hour of
Until 2:36 pm, bringing the highest value in history.


We have also observed numerous lightning strikes, mainly in the city center.



Even after this, in the Kanto region, locally, there will be extremely heavy rain with thunder, or in some places, heavy rain will fall, and there will be heavy rain.



Beware of low land flooding, and
/Please be careful of underpasses and underground facilities, especially in urban areas.

If you hear thunder or see lightning, enter a sturdy building and wait for the thunderstorm tornadoes to pass as there is a risk of severe gusts of wind blowing.




Tonight, around 7pm when we got home, there could be continued heavy and extremely heavy rain in the southern Kanto region, affecting the operation of
Trains and other trains.

Please check the surrounding conditions frequently using rain cloud radar and
Please be careful of traffic information.

Three-day holiday: West to East Japan Sea of Japan side warning level heavy rain, Northern Japan is causing heavy rain, impact on transportation, autumn rain front becomes active [weekly weather forecast]

2025/09/11 12:09

Weekly Weather Forecast
#Statics near Japan on the autumn rain front Cloudy and rain will settle for the fierce lingering heat
#3-day holiday: West to East Japan Sea of Japan side warning level heavy rain Northern Japan raging
#After the three-day holiday, the front has left the front once again, but the front has moved south to Honshu



#Statics near Japan on the autumn rain front Cloudy and rain will settle for the fierce lingering heat
In the future, the autumn rain front will be stagnant near Japan, with many days of wide cloudy and rainy weather expected to be. The fierce heat will calm down.
Tomorrow, the autumn rain front is expected to become gradually unclear near Honshu, the 12th (Friday).
While front activity will weaken for a while, due to the cold air above, there will be some areas in Tokai and Kanto where heavy rain will be at the level of warning.



#Three-day holiday: West to East Japan Sea of Japan side warning level heavy rain Northern Japan
Today, the first day of the three-day holiday, on the 13th (Saturday), a low pressure system with a front develops, will move eastward through the Sea of Japan, and the front extends into the East China Sea and northern Japan.
On Sunday the 14th, as a lying pressure system develops, the front will move towards the coast of the Kuril Islands, and the front will extend from the lying pressure system to the vicinity of Japan.
After that, the front will be separated from the low pressure system and is expected to remain on the coast of the Sea of Japan.
During the three-day holiday, warm and humid air flows towards the low pressure and the front line, and front line activity is expected to increase.
In particular, from the 13th (Saturday) to the 14th (Sunday), there is a risk of heavy rainfall being caused by warning levels, mainly on the Sea of Japan side of the west and eastern Japan and northern Japan.
In northern Japan, which is close to the developing low pressure system, a storm will blew through the 14th (Sunday), with side-beating rain falling, causing a huge uproar.
This may affect transportation.
If you are planning to go out during the three-day holiday, be sure to pay attention to the latest weather information.
Also, due to the extremely unstable atmosphere during three-day weekends, even in areas where the weather forecast has a sunny spot, you should be careful of sudden changes in weather.





#After the three-day holiday, the front has left for a while, but the front has moved south to Honshu
On the 16th (Tuesday), the autumn rain front is expected to depart slightly from Japan and extend to the coast of the Sea of Japan in the western Japan.
There are expected rain on the Sea of Japan side of Western Japan, but high pressure will move around the area around northern Japan, and many areas will be sunny, mainly in northern Japan.
However, from Wednesday the 17th to Thursday the 18th, the front will continue southwards around Honshu and around valleys of atmospheric pressure, and on Thursday the 18th, the front is expected to move south again around Honshu.
The clouds will spread, and the area where rain will gradually expand.