General Winter will attack from tomorrow. [Ministry of Land, Infrastructure, Transport and Tourism] also calls for heavy snowfall

2025/12/02 15:31

From tomorrow, December 3rd (Wednesday) to December 4th (Thursday), a winter-like atmospheric pressure pattern will be strengthened near
Japan, and extremely cold air, colder than midwinter, is expected to flow into the sky above
.



Looking at the forecast for cold air at midnight on the 4th (Thursday),
cold air that will bring snow on the plains (-6 degrees Celsius or lower at around 1500 meters above the ground) is expected to flow from southern Kyushu to Kinki, Tokai, and northern Kanto.

Even stronger cold air, below -12c, will flow into Akita.

The average cold in early December is around -5.0c,
even in the middle of winter it is around -10c, so we are expecting a strong cold (winter shogun) colder than
midwinter.

Yesterday, December 1st (Monday) and today, December 2nd (Tuesday), it was warm and

As many places experienced early spring weather,
the coldness of mid-winter will arrive all at once, and the temperature difference will be severe.



Furthermore, snow will fall mainly on the Sea of Japan side of northern and western Japan,
in addition to heavy snowfall in the mountains, there is also the possibility of snow accumulation on flatlands.

It looks like there will be many places in western Japan and the Tokai region where the first snow will be observed.

In addition, extremely strong winds will blow from the Tohoku region to the Hokuriku region,
causing a blizzard and there is a risk of sea barges.


The Ministry of Land, Infrastructure, Transport and Tourism has issued an announcement to be on guard against heavy snow and blizzards starting tomorrow.



+If it is unavoidable for drivers to drive, please make sure to install
winter tires, check in advance how to install chains, carry them with you,
as early as possible, and carry winter equipment such as shovels and sand.

In addition, due to snowfall conditions, large areas of expressways and national highways parallel to them may be closed at the same time.
We ask for your cooperation in implementing wide-area detours and reviewing traffic routes.


+During heavy snowfall in the past, the main cause was large vehicles getting stuck,
causing a huge impact.
Transport operators are required to take the necessary measures to ensure
safety, such as
ensuring that commercial vehicles are equipped with winter tires, when there is a risk of hindering transportation safety, such as during heavy snowfall.

In addition, in the event of a malicious stranding on a snowy road, such as neglecting to take necessary measures,
will be subject to administrative sanctions after confirming the facts through an audit and if it is determined that the measures taken are insufficient.
Please perform appropriate operation management.
On the other hand, shippers are also asked to refrain from making urgent transportation requests to trucking companies.

+In areas where heavy snow is expected, there is a risk of large-scale and long-term delays or suspensions of public transportation.

+Please pay attention to the latest weather and traffic information, and in areas where heavy snow is expected,
please refrain from going out for non-essential reasons, including using telework.
If you need to go out, please allow sufficient time.

[Ocean Summary] Storm warning issued in northern Japan due to high pressure in the west and low pressure in the east. Waves are widely rising and wave height exceeds 5m in some places (November 23rd to November 29th)

2025/12/02 12:42

Near Japan, the atmospheric pressure was often high in the west and low in the east, and the gradient of the atmospheric pressure became large.
Winds were increasing widely and strong wind warnings were issued in some parts of northern Japan, where the area is close to low pressure.
The waves were so high that in some places it became a barge.
Below is a summary of the ocean (November 23rd to November 29th)



#Pressure distribution and waves
From the 26th to the 29th, the Nansei Islands became the southern edge of the continental high-pressure system, and a state of large pressure gradient continued.
In the waters near the Nansei Islands, high waves continued, mainly south of Okinawa.
On the 26th, the pressure around Honshu was high in the west and low in the east, and between the low pressure east of Japan and the high pressure in the East China Sea, the pressure gradient became large and waves became high over a wide area.
On the 27th, the gradient in atmospheric pressure increased between a low pressure system far east of Japan and a high pressure system east of Japan, and waves became high in the east of Japan.
On the 28th and 29th, a low pressure system east of Japan moved eastward, and a low pressure system over the Sea of Okhotsk moved northeast.
Once again, the atmospheric pressure around Japan was high in the west and low in the east.
The pressure gradient became larger between these low pressure systems and the high pressure systems moving from the continent to the vicinity of Japan.
In northern Japan near the low pressure system, storm warnings were issued in some places.
On the 28th, waves rose in the waters near Japan, with waves rising in southeastern Hokkaido and the central and western parts of the Sea of Japan, and exceeding 5 meters in height off the coast of Noto.
On the 29th, it became a barge in the middle and northern part of the Sea of Japan, the Sea of Okhotsk, and the east of Japan.



#Sea surface temperature
Sea surface temperatures in the Japanese waters continued to be lower than normal along the coast of Hokkaido.
In the central and western parts of the country, sea areas with temperatures higher than normal or significantly higher expanded, with temperatures up to 3 C higher than normal.
The East China Sea has expanded to a normal level.
Western Kyushu was slightly higher than normal.
Sea areas south of Japan continued to be at normal levels, while areas off the coast of the Tokai Sea and near the Izu Islands expanded in areas with lower than normal levels.
The temperature in the east of Japan was significantly higher than normal, with a maximum of 4 C above normal.
The waters off the coast of Sanriku were at normal levels, the southeastern part of Hokkaido was significantly lower than normal, and the Sea of Okhotsk continued to be at normal levels.

Tomorrow, the 3rd (Wednesday), the coldest air of the season will arrive. There is a risk of snowfall even on flat areas in northern and western Japan on the Sea of ??Japan side.

2025/12/02 07:58

Tomorrow, the 3rd (Wednesday), the area around Honshu is expected to experience a winter-like atmospheric pressure pattern of high in the west and low in the east. At around 1,500 meters above the ground, strong cold air with temperatures below -6 C is expected to flow in, causing snow to fall even in flat areas. As a result, it will snow widely from northern Japan to western Japan on the Sea of Japan side, and there will be some places where it will snow even in flat areas.




Looking at the snow forecast for tomorrow, the 3rd (Wednesday), from northern Japan to the Sea of Japan side of the San'in area, as strong cold air moves south through the night, rain will turn to snow, and the snow is expected to cover a wide area.
Also, a line called the Japan Sea Polar Air Mass Convergence Zone (JPCZ) is expected to form over the Sea of Japan on the 3rd tomorrow, where the seasonal winds that are split into two in the mountainous region of the northern Korean Peninsula merge over the Sea of Japan (red dashed line in the diagram). Band-shaped snow clouds are expected to develop in this area, and the snow is expected to intensify with the addition of strong cold air in the upper atmosphere.

The snow is expected to peak on the night of Wednesday the 3rd. The purple areas are areas where snow is expected to be especially heavy, with increased snowfall mainly along the mountains from Tohoku to the San'in region, and there will be some places where it will snow even in flat areas. Additionally, the spacing between the isobar lines is narrow and northerly winds will become stronger, resulting in snowstorms in some places.

In Hokuriku, northern Kinki, and San'in areas, there are likely to be some places where news of the first snowfall will arrive, but it is also possible that the first snowfall will turn into snowfall. In addition, some of the strong cold air will also flow into the skies above Shikoku, so there is a possibility that it will snow in the mountainous areas of Shikoku and the Pacific side of the Tokai region into tomorrow, the 4th (Thursday).

From the 3rd tomorrow to the 4th, please be careful of poor visibility and traffic obstacles caused by the snowstorm, and if you are driving a car, please take all possible precautions, such as switching to winter tires.

Today's weather on the 2nd (Tuesday) The weather is going downhill from the afternoon from northern Japan to Hokuriku. Beware of blizzard in Hokkaido.

2025/12/02 06:52

Today, a developing low pressure system will advance over the Sea of Japan, and the low pressure system and front will pass near northern Japan. The weather is going downhill on the Sea of Japan side of northern Japan and Hokuriku. A front is expected to remain stationary in the south of Honshu during the night.



Hokkaido, Tohoku, and Hokuriku will experience rain and snow from the afternoon to evening due to the effects of low pressure and fronts. There may be localized lightning, so be careful of lightning, tornadoes, violent gusts of wind, hail, and hail. In Hokkaido, strong cold air in the sky is expected to move southward tonight, and the area of snow is likely to expand. Due to the developing low pressure, the distance between the isobar lines will narrow, and there will be some places where there will be blizzards. Please be aware of poor visibility due to snowstorms.



The sky around the Kanto region is cloudy, and there are likely to be showers in some places. It's a good idea to have a folding umbrella when you go out. The Ogasawara Islands are expected to experience rain through the morning due to the front, and the Izu Islands are likely to experience showers and thunderstorms in some places due to the front.

From the Tokai region to the west, there are many places where it is sunny, and there are places where the temperature can rise to nearly 20c during the day. A front is expected to gradually form in the south of Honshu in the afternoon, and showers are likely to occur in places on the Pacific side of western Japan. At the beginning of the night, there will be some showers in the shadows of the mountains.

Okinawa and Amami will be cloudy due to humid air, and there will be localized rain. There are likely to be places in the Sakishima Islands where there will be heavy rain with thunder from morning until noon. Please be careful about how it rains.

The weather has changed from the early spring weather, and General Winter has arrived!! Stormy weather and heavy snow on the Sea of ??Japan side of northern and eastern Japan. Snowfall on the Sea of ??Japan side of western Japan as well.

2025/12/01 12:56

Today, the 1st (Monday), the start of December will be a sunny day in many places.
However, things changed after Koharu weather. General Winter is expected to attack this week.
From around the 3rd (Wednesday), the strongest cold air of the season will move south over the Japanese archipelago.
Towards the 4th (Thursday), a winter-like atmospheric pressure pattern will occur, leading to rough weather mainly on the Sea of Japan side of northern and eastern Japan, with the risk of heavy snow.
There will be places where snow accumulates even on the Sea of Japan side of western Japan.
There is a possibility of the first snow in Hokuriku and the plains of western Japan.



#Toward winter-type air pressure distribution On the 3rd (Wednesday), a low pressure system will form east of the Kanto region and will continue to develop as it moves eastward through the east of Japan.
An anticyclone is protruding from the continent, and the area around Japan is expected to gradually become winter-like, with high pressure in the west and low pressure in the east.
And the strong cold air that is approaching the continent will flow into the skies over the Japanese archipelago from around the 3rd (Wednesday).
On the 4th (Thursday), a developed low pressure system will move through the Sea of Okhotsk, and a continental high pressure system will extend south of Japan, with a winter-like pressure pattern expected to continue mainly in northern Japan.
The cold air, which is below -6c at around 1500m above the ground, which is the standard for snow in flat areas, will move southward to the Pacific side of eastern and western Japan from the night of the 3rd (Wednesday) to the 4th (Thursday).
The coldest air of the season is heading south, almost like midwinter.

#Snowfall is rapidly increasing. Warning-level heavy snowfall, fear of storms. Snowfall expected in western Japan as well



From the 3rd (Wednesday) to the 4th (Thursday), snow will continue to fall intermittently along the Sea of Japan side of northern Japan, Hokuriku, and the northern mountains of Kanto-Koshin, and snowfall is expected to increase rapidly.
It will snow even in the plains of Hokuriku, making it the first snow in some places.
On the 4th (Thursday), there is a risk of warning-level heavy snow mainly along the mountains on the Sea of Japan side of northern and eastern Japan.
Also, the spacing between the isobars will become closer, and the northerly monsoon winds will become stronger.
The weather is likely to be rough from the 3rd (Wednesday) to the 4th (Thursday), with strong winds and high waves mainly on the Sea of Japan side of northern and eastern Japan.
There are some places where there will be a blizzard, which may affect transportation.
In western Japan, it will snow in the mornings and evenings even in the northern Kinki region and the plains of the San'in region, and there will be places where you will receive news of the first snowfall.
On the Sea of Japan side of western Japan, snow is expected to accumulate in some places, mainly along the mountains.
Please be careful of snowfall and changes in road conditions, and be sure to use winter tires when driving.

# A change from a sunny early spring; winter cold from the 3rd to the 5th; cold bottom on the 4th
Temperatures are expected to be lower than normal in western Japan and Hokuriku on the 3rd (Wednesday).
The 4th (Thursday) will be the coldest day, with temperatures nationwide dropping below normal.
From Okinawa to Tohoku, temperatures are expected to be much lower than normal in many places.
On Friday the 5th, temperatures will be lower than normal across the country.
Please prepare cold weather gear to avoid getting sick due to the sudden cold.

Northern Japan is at risk of stormy weather as a developing low-pressure system passes through. Be careful and be on guard against increasing rain and wind.

2025/12/01 06:57

A low pressure system accompanied by a front is moving east-northeast across the Sea of Japan. The low pressure system will pass through the Soya Strait into the Sea of Okhotsk through the evening of the 1st, and the front will pass through the Tohoku region. As a result, the gradient in atmospheric pressure will increase in the Hokkaido region, and on the Sea of Japan side, winds are expected to be extremely strong today, mainly over the sea.
As of 6:20 a.m., a storm warning has been issued for the Rumoi and Ishikari regions.

Also, the atmospheric conditions in northern Japan will be extremely unstable due to the effects of warm, humid air heading towards low pressure systems and fronts, as well as cold air in the upper atmosphere. In the Tohoku region, cumulonimbus clouds are expected to develop and thunderstorms are expected to occur in some places. In the northern part of Tohoku on the Sea of Japan side, the ground has become loose in some places due to previous rain, so even a small amount of rain can increase the risk of landslides and lead to warning-level heavy rain.



#Expected wind strength
+Maximum wind speed (maximum instantaneous wind speed) expected for today 1st
Northern land on the Sea of Japan side 18m/s (30m/s)
Northern Sea on the Sea of Japan side Upper 20m/s (30m/s)
Southern land on the Sea of Japan side 18m/s (30m/s)
Southern sea on the Sea of Japan side 18m/s (30m/s)

# Expected amount of rain (in most places)
+1-hour precipitation expected today on the 1st
Northern Tohoku Sea of Japan side 20mm
+24-hour precipitation expected by 6:00 tomorrow 2nd (Tuesday)
Tohoku Sea of Japan side Northern area 40mm

[Disaster prevention matters]
On the Sea of Japan side of Hokkaido, the wind will blow very strongly mainly at sea today, so please be on guard for strong winds from noon until evening today. Depending on the degree of development of the low-pressure system, the period and area of stormy winds may expand.

In the northern part of Tohoku on the Japan Sea side, the ground has become loose in some places due to the rain that has fallen so far. Please be careful and be on guard against landslides caused by heavy rain from early tonight on the 1st.
Also, in northern Japan, please be careful of damage to crops and agricultural facilities due to strong gusts such as tornadoes, lightning, sudden heavy rain, and hail from the evening of today 1st.

Today's weather (Monday): Rain and snow in northern Japan; weather in Hokuriku is going downhill; clear skies across eastern and western Japan on the Pacific side

2025/12/01 06:21

Today, the 1st (Monday), the start of December, a low pressure system and front will pass through northern and eastern Japan. There are places in northern Japan where it has been raining since the morning, and it seems that there will be places in Hokuriku and the Sanin area where it will gradually rain. It will be sunny in many places on the Pacific side.



It will rain from the morning on the Sea of Japan side from Hokkaido to Tohoku due to the effects of low pressure and fronts. Rain is expected to increase locally and thunderstorms may occur in some places. Be careful of lightning, gusts of wind, and hail.
As cold air gradually flows into Hokkaido, it is likely that there will be places where the weather turns to snow at night. Please be careful of strong winds mainly in coastal areas.

In Hokuriku, the weather is likely to rain from around noon.
There is a possibility of showers even in the Sanin area, so it is best to bring rain gear when going out.

The Pacific side of eastern and western Japan will have sunny skies in many places, and it looks like it will be a nice early spring day. There will be a large difference in temperature between morning and evening and during the day, so please be careful when choosing clothing.

Be careful of rough weather mainly in Hokkaido, Tohoku/Hokuriku, and the Sea of ??Japan side.

2025/11/30 17:43

There is a low pressure system in the northern Sea of Japan, moving northeast, and a warm front extending from the low pressure system is passing over Hokkaido.

Another low-pressure system is moving eastward west of the Korean Peninsula.
This low pressure system will advance from the Sea of Japan to the Sea of Okhotsk tomorrow, December 1st (Monday), while rapidly developing along with a front.
As the front extending from the low pressure system passes from northern Japan to western Japan, there will be places from Hokkaido to the Tohoku and Hokuriku regions where the atmospheric conditions will become extremely unstable due to the effects of warm, humid air heading toward the front and low pressure system and cold air in the upper atmosphere.
Cumulonimbus clouds are expected to develop and thunderstorms are expected to occur in some areas, and there is a risk of tornadoes, strong wind gusts, lightning strikes, hail, and sudden heavy rain.





Also, with the development of a low pressure system, the gradient of atmospheric pressure will increase and strong winds are expected.
Tomorrow, December 1st (Monday), there is a risk of strong winds depending on the degree of development of the low pressure system, so please be careful of strong winds in northern Japan, especially Hokkaido.



In the northern part of the Sea of Japan side of Tohoku, the ground has loosened in some places due to previous rains, so even a small amount of rain could increase the risk of landslides and lead to warning-level heavy rain.
Please be careful and be on guard against landslides caused by heavy rain.



###Wind forecast
Maximum wind speed (maximum instantaneous wind speed) expected on December 1st
Hokkaido Northern land on the Sea of Japan side 18 meters (30 meters).
Hokkaido Northern Sea of Japan Sea side 18 meters (30 meters).
Hokkaido Southern land on the Japan Sea side 16 meters (30 meters).
Hokkaido Southern Sea of Japan Sea side 18 meters (30 meters).
Hokkaido Pacific Ocean side land area 13 meters (25 meters).
Hokkaido Pacific Ocean side 18 meters (30 meters).
Hokkaido Pacific Ocean side eastern land 12 meters (25 meters).
Hokkaido Pacific Ocean side Eastern Sea 15 meters (25 meters).
Hokkaido Northern land on the Sea of Okhotsk side 13 meters (25 meters).
Hokkaido, Northern Sea of Okhotsk side, 15 meters (25 meters).
Hokkaido Southern land on the Sea of Okhotsk side, 12 meters (25 meters).
Hokkaido Sea of Okhotsk side, southern sea, 15 meters (25 meters).

###Rain Forecast
The predicted hourly rainfall on December 1st is 20 mm in the northern part of Tohoku, Japan Sea side.

The predicted 24-hour precipitation from 6:00 PM on the 30th to 6:00 PM on December 1st is expected to be 50 mm in the northern part of Tohoku, Japan Sea side.

Tomorrow, the 30th (Sunday), will be a perfect day for tourists in western and eastern Japan, but it will be raining and snowing in northern Japan!

2025/11/29 18:12

There is a low pressure system east of the Sea of Okhotsk and the Kuril Islands, creating a trough of pressure.
There is also a low pressure system in Northeast China, moving northeast.
On the other hand, there is a high pressure system near the Sea of Japan, Kyushu, and southern China, which extends from Tohoku to Okinawa.

Around Japan, there are many clouds in Hokkaido, northern Tohoku, and the Sea of Japan side, but
other areas are covered by high pressure and are sunny.



Tomorrow, the 30th (Sun), will also be sunny in many places as western and eastern Japan will be covered by high pressure.
It is likely to rain in some places on the Sea of Japan side at night.
During the day, the temperature can reach nearly 20 degrees Celsius in some places, making it a pleasant and sunny day, but please be aware that there is a large temperature difference between morning and evening.
Also, the air can be dry in some places, so please be careful when handling fire.



A front extending from a low pressure system moving from the northern Sea of Japan to the Sea of Okhotsk is expected to pass over northern Japan.
Atmospheric conditions will be extremely unstable due to the effects of warm, moist air flowing toward low pressure systems and fronts, as well as cold air in the upper atmosphere.

For this reason, it is likely to rain from Hokkaido to Tohoku on the Sea of Japan side and north of Hokkaido on the Sea of Okhotsk side, and snow along the mountains.
In addition, there is a risk of tornadoes, strong gusts of wind, lightning, hail, and sudden heavy rain from dawn to dusk.
Please be careful when doing outdoor activities and managing crops.
If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving to a sturdy building.



The day after tomorrow, the 1st (Monday), the low pressure system is expected to move northeast across the Sea of Japan.
In western and eastern Japan, there will be sunny skies in some places, especially on the Pacific side, but there will be many places on the Sea of Japan side and northern Japan where the weather will be cold.

Weekly weather: The coldest air of the season will hit from around the 3rd of next week. There is a possibility of snowfall even on flat areas on the Sea of ??Japan side

2025/11/29 08:45

Over the next week, a series of low pressure systems and fronts will pass through northern Japan. Around the 3rd of next week, there will be a strong winter-like atmospheric pressure pattern, and strong cold air will move south, making it suddenly winter cold. On the Sea of Japan side, even flat areas are likely to experience snowfall.



Hokkaido and Tohoku will be affected by low pressure and fronts, and it will rain on the 30th (Sunday). On the 1st (Monday), a new low pressure system will develop and pass near Sakhalin, and northern Japan is likely to experience stormy weather. In Hokkaido, rain will change to snow overnight on the 1st. Due to the influence of the front moving south, it is likely to rain in Hokuriku on the 1st (Monday).



Rain and snow are expected to continue from the Sea of Japan side of northern Japan to Hokuriku until the 5th (Friday), and the season's strongest cold air is expected to move south around the 3rd (Wednesday). Looking at the forecast for cold air, it is predicted that cold air with temperatures below -6 C will move south to Hokuriku at an altitude of approximately 1,500 meters, which is the standard for snowfall in flat areas. Some of the cold air below -6c will also flow into the skies above the San'in region.



For this reason, from the Sea of Japan side of northern Japan to the Hokuriku region, there is a risk of heavy snow along the mountains, and even on flatlands there will be heavy snowfall, and there will be snowfall in some places. Even in the northern Kinki and San'in regions, snow may accumulate mainly along the mountains and on flatlands. Please prepare for snowy roads by changing to winter tires early. When driving, pay attention to road conditions.

As the strong cold air moves south, it looks like we'll be in the middle of winter all at once. The predicted maximum temperature in Sapporo on the 4th (Thursday) is -1c, which is expected to be a mid-winter day, and in Hokuriku, Niigata and Kanazawa are expected to reach 6c, which is expected to be similar to January. East Japan and the Pacific side of western Japan will continue to have sunny days throughout the period, but the expected maximum temperature after the 4th (Thursday) will be around 10c, which will be similar to January in some places. Please take care of your health.
Also, the air is drier in areas facing the Pacific Ocean, so be careful when handling sources of fire.