A low pressure system develops, leading to stormy weather in northern Japan. Hokkaido is on alert for traffic disruptions and strong winds due to heavy blizzard.

2026/03/07 07:28

A low pressure system is located near Tohoku and is moving north-northeast. A cold front extending from this low pressure system is passing from Tohoku to Kanto.
This low pressure system will develop and move toward Hokkaido by the evening of today, the 7th (Saturday), and will move slowly over the Sea of Okhotsk tomorrow, the 8th (Sunday).
For this reason, there will be a large gradient in the atmospheric pressure in northern Japan into tomorrow, the 8th (Sunday), and stormy winds will blow from the west on the Sea of Japan coast of Tohoku, causing severe turbulence.




#Expected wind forecast
+Maximum wind speed (maximum instantaneous wind speed) expected today, the 7th (Saturday)
[Hokkaido]
Northern land on the Sea of Japan side 18 m/s (30 m/s)
Northern sea on the Sea of Japan side 20 m/s (30 m/s)
Southern land on the Sea of Japan side 18m/s (30m/s)
Southern sea on the Sea of Japan side 20m/s (30m/s)
Western Pacific Ocean Land 15m/s (30m/s)
Western Pacific Ocean Sea 20 m/s (30m/s)
[Tohoku]
Sea of Japan side Sea 20m/s (30m/s)
Sea of Japan side Land 15m/s (30m/s)
Pacific side sea 18m/s (30m/s)
Pacific side land 15m /s (30m/s)

+Maximum wind speed (maximum instantaneous wind speed) expected for tomorrow, the 8th (Sunday)
[Hokkaido]
Sun Northern land on the Honkai side 20m/s (35m/s)
Northern sea on the Sea of Japan side 20m/s (30m/s)
Southern land on the Sea of Japan side 18m/s (30m/s)
Southern sea on the Sea of Japan side 20m/s (30m/s )
Pacific side western land 15m/s (30m/s)
Pacific side west sea 20m/s (3 0m/s)

#Expected wave height
+Expected wave height today, 7th (Sat)
[Tohoku]
Sea of Japan side 6m
+Expected wave height tomorrow 8th (Sunday)
[Hokkaido]
Northern Sea of Japan side 5m
Sea of Japan Southern side 5m
Western Pacific side 5m

#Expected amount of snow (in places with a lot of it)
+24-hour snowfall expected by dawn on the 8th (Sunday)
[Hokkaido]
Northern Sea of Japan side 50cm
Northern Sea of Okhotsk side 5 0cm
+24-hour snowfall forecast by dawn on the 9th (Monday) tomorrow 9th (Monday)
Northern Sea of Japan side 30cm

#Disaster prevention matters
In Hokkaido, the wind will be very strong with snow mainly on the Sea of Japan side tomorrow 8th (Sunday), and it will cause barges at sea. In addition, heavy snow is expected to fall in some places.
In the northern part of the Sea of Japan, please be on guard for traffic disruptions and strong winds due to heavy blizzard and snowdrifts from early morning until noon tomorrow, the 8th (Sunday).
On the Sea of Japan side, please be careful about traffic disruptions due to snowdrifts and strong winds from the early evening of today's 7th (Saturday) to the evening of tomorrow 8th (Sunday), high waves from early morning until evening on the 8th (Sunday), and traffic disruption due to heavy snow from early morning until evening on the 8th (Sunday) on the northern Sea of Japan side.
Also, please be careful as wet snow is falling and there is a risk of avalanches and snow deposits on power lines.
Depending on the degree of development and course of the low-pressure system, the duration and area of the blizzard may expand, resulting in severe or warning-level heavy snow.
Please note that the drift ice moves rapidly, so please be careful.

At sea on the Sea of Japan side of Tohoku, please be on guard for strong winds from the west from before noon to early evening today, the 7th (Saturday), and be on guard for damage to ships and coastal facilities from high waves from late afternoon to late evening today, the 7th (Saturday). Additionally, on the Pacific side of Tohoku, caution and vigilance are required due to strong winds from the west from noon until late at night today, the 7th (Saturday).

Weather for today, the 7th (Saturday): Beware of stormy weather in northern Japan; many places from Kanto to the west will be sunny

2026/03/07 06:42

Today, the 7th (Saturday), a low pressure system is expected to develop and move towards northern Japan. There is a risk of snow, rain, strong winds, and rough weather in northern Japan, especially Hokkaido.



Due to the influence of the low pressure system, heavy snow and rain is expected in northern Japan. In Hokkaido, there is a risk of heavy snow due to wet snow mainly along the inland mountains on the Sea of Japan side. In addition, the winds are strong, especially in the coastal areas, and there are places where it can become violent, so you need to be careful about blizzards.
At night, the atmospheric pressure will gradually change to a winter-like pattern, so during the day there will be areas where rain will turn to snow, and the range will expand.

It's likely to be a day of rain and snow from Hokuriku to the Sanin area. Please bring sturdy rain gear when going out.

From the Kanto region to the west, sunlight is likely to reach mainly the Pacific side. The weather will be fine for going out. There are some places in the Kanto region where the rain will remain until the morning, but the weather looks like it will gradually improve.

Even in western Japan, where the weather is sunny during the day, temperatures will rise slowly and many places will be lower than normal. Please keep warm when going out.
In the Kanto region and southern Tohoku region, temperatures are expected to rise from the previous day and become as warm as April. It gets colder at night, so please be careful of the temperature difference throughout the day.
The temperature in northern Japan is typical for this time of year.

[Stormy weather] Stormy weather mainly in northern Japan on Saturday and Sunday, with strong winds affecting transportation

2026/03/06 14:15

This Saturday and Sunday, the weather is likely to be rough mainly in northern Japan.



First, here's what the rain clouds look like.

As of 11 a.m., a band of rain clouds is hanging from Kyushu to the Chugoku region.
There are active rain clouds in some places,
1 hour precipitation is 10.5 mm in Ushibuka, Amakusa City, Kumamoto Prefecture, and the rain is becoming heavier.



This is the forecasted weather map for tonight.
A low pressure system accompanied by a front is expected to develop in the Sea of Japan through the night.
A front extending from this low pressure system is expected to pass through Honshu.
After this, rain clouds are likely to move from the west to the east.




From evening to night, band-shaped rain clouds move from west to east.
Rain clouds are long vertically but short horizontally, and the period of rain is expected to be short.
However, when it rains, the rain will become heavier and there may be thunderstorms in some places.

At night, rain clouds begin to roll in from the west in the Tohoku region.
Late at night, it is likely to start raining in some parts of the Kanto region,
there is a risk of heavy rain accompanied by thunder from early morning to early morning on the 7th (Saturday) in the Kanto region.
Please be careful of lightning strikes and gusts of wind.

It looks like snow will gradually change to snow in some places in the Tohoku region tomorrow, the 7th (Saturday).



Snow, rain, and wind forecast.

In the Tohoku region, there will still be rain and sleet in many places tomorrow morning, but
in the afternoon, cold air will flow into the sky,
and the precipitation will gradually turn to snow.

And the wind is getting stronger.

The predicted wind strength in the Tohoku region tomorrow is 30 meters.
This 30 meter wind is so strong that people can't walk into the wind,
and it can cause people to fall.
Please be careful as transportation may also be affected.

Looking at the forecast weather map for Saturday and Sunday,
this low-pressure system is developing and slowing down near Hokkaido.
Snow continues to fall in similar places, and the storm is likely to continue for a long time.
The strong winds are not likely to subside until the beginning of the week in Hokkaido.



Today, the 6th (Friday), rain clouds will spread from the west, and it will rain and snow in the Tohoku region at night.
The Kanto region is marked cloudy, but please be careful of showers at night.



The weather will improve tomorrow, the 7th (Saturday), but there will be rain and snow on the Sea of Japan side.
Northern Japan requires caution and vigilance due to increasing winds.

The predicted high temperature for tomorrow is 18 degrees in Tokyo, which will be warm as warm air moves in.
In other areas, cold air will flow in and the temperature will be low, and the wind will be strong and it will feel chilly.



From now on, snow in northern Japan and Hokuriku is likely to last until around Tuesday.
The strong winds will subside by the end of the week.

On the Pacific side, it will be sunny in many places in the first half of next week, but
clouds will likely spread more easily in the second half of next week.

The return of cold weather next week will be temporary; cherry blossoms will bloom earlier as temperatures tend to be higher than normal; light rain will return once again [1-month forecast]

2026/03/06 12:06

The weather will have a winter-like atmospheric pressure pattern over the weekend, and the cold will likely return from the 8th (Sunday) to the 9th (Monday).
Temperatures will be lower than normal, especially in Hokuriku and western Japan.
However, the return of the cold is temporary, and the effects of the cold air will be weak over the next month, so temperatures are expected to be at or above normal across the country.
In some places, news of cherry blossom blooming may arrive earlier than usual.
Also, it is expected that there will be little precipitation over the next month, so there is a possibility that there will be light rain again.



#Winter-type atmospheric pressure distribution is unlikely to occur
Yesterday, the 5th (Thursday), the Japan Meteorological Agency announced the one-month forecast for March 7th to April 6th.
The average sea level pressure for the next month is predicted to be that a high pressure system will gradually cover eastern and western Japan, Okinawa and Amami.
Also, no low pressure is predicted near the Aleutians, so it is unlikely that northern Japan will experience a winter-like pressure pattern.
The temperature at an altitude of approximately 1,500 meters is predicted to be lower than normal in the south of Japan, higher in the north, and slightly higher than normal in many places near Japan. Near Japan, the north-south slope of temperature is smaller than normal, making it difficult for low-pressure systems to form, especially during the first half of the period.



#High temperature trend - Will cherry blossoms bloom earlier
As the effects of the cold air are weak, temperatures are expected to be at or above normal across the country over the next month.
Northern Japan is unlikely to experience winter-like atmospheric pressure patterns, so temperatures will be higher than normal in early March, and at or above normal from mid-March to early April.
Eastern and western Japan will be at normal levels in early March, but are expected to be at or above normal levels in mid-March.
With the rise in temperature in mid-March, cherry blossoms may bloom earlier than normal in some places.
From late March to early April, eastern Japan is expected to be at or above normal, while western Japan is expected to be above normal.



#Not easily affected by low pressure; Possibility of light rain again
As it is easily covered by high pressure and is less affected by low pressure and fronts, precipitation over the next month will be low on the Pacific side of eastern Japan, western Japan, and Okinawa/Amami, and will be at or below normal on the Sea of Japan side of eastern Japan.
The number of sunshine hours over the next month is expected to be higher in the Pacific side of eastern Japan, western Japan, Okinawa/Amami, and at or above normal on the Sea of Japan side of northern and eastern Japan.
Since mid-November of last year on the Pacific side of eastern Japan and western Japan, and since early January of this year on the Pacific side of Tohoku, conditions with little precipitation continued until mid-February, being less susceptible to the effects of low pressure.
The rain since late February has eased the situation, but many of these areas are expected to see little precipitation over the next month, so there is a possibility that the situation will return to dry conditions.



#Weather for the next month
On the Sea of Japan side of northern Japan, the weather will change every few days, but there will be fewer cloudy, snowy, or rainy days than in normal years.
On the Pacific side of northern Japan, the weather will change every few days, and it is expected that there will be many sunny days, similar to normal years.
On the Sea of Japan side of eastern Japan, the weather will change every few days, but there will be fewer cloudy, rainy, or snowy days compared to normal years.
The weather on the Pacific side of eastern Japan and western Japan will change every few days, but it is expected that there will be more sunny days than normal.
In Okinawa/Amami, the weather changes every few days, but there will be fewer cloudy and rainy days compared to normal years.

From Tokai to Tohoku, watch out for strong winds, high waves, lightning and gusts due to developing low pressure and fronts.

2026/03/06 10:24

A low pressure system accompanied by a front is located in the western Sea of Japan and is moving eastward.
From tomorrow, the 7th (Saturday), the low pressure system is expected to develop and move toward the northern Sea of Japan, and the front extending from the low pressure system is expected to pass through Honshu.
Atmospheric conditions will be very unstable as warm, humid air flows in from the south toward the low pressure system and front.



In the Tokai region and the Kanto-Koshin region, please be careful of lightning, tornadoes, strong gusts, sudden heavy rain, and hail from the early evening of today, the 6th (Friday) until the morning of tomorrow, the 7th (Saturday).



Over the sea in the Hokuriku region and the northeast Sea of Japan side, there will be a large gradient in atmospheric pressure, and storm winds will blow from the west, causing a big storm on the sea.
If the low pressure develops more than expected, there is a possibility of warning-level high waves.
Please be on guard for strong winds tomorrow, the 7th (Saturday) from noon until early evening, and be wary of high waves tomorrow, the 7th (Saturday) from morning until late at night.



#Wind forecast
Maximum wind speed (maximum instantaneous wind speed) expected on the 7th
Tohoku Sea of Japan side Sea 20 meters (30 meters)
Tohoku Sea of Japan side Land 15 meters Tor (30 meters)
Tohoku, Pacific side, sea 18 meters (30 meters)
Tohoku, Pacific side, land 15 meters (30 meters)

#Wave forecast
Expected wave height on the 7th
Tohoku Sea of Japan side 6 meters
Hokuriku Niigata Prefecture 5 meters
Hokuriku Ishikawa Prefecture 4 meters

#Disaster prevention matters
Tohoku Sea of Japan side At sea, please be on guard for traffic disruption and damage to buildings due to stormy winds from the west from before noon to early evening on the 7th, and from the evening of the 7th to late at night on high waves for damage to ships and coastal facilities.

In the Hokuriku region, please be careful of high waves from the morning of the 7th until late at night.

In the Tokai and Kanto-Koshin regions, please be careful of thunderstorms, tornadoes, strong gusts of wind, and sudden heavy rain from early on the night of the 6th until the morning of the 7th.
If there are signs of a developing cumulonimbus cloud approaching, please take every precaution to ensure your safety, such as moving inside a building.
There is also a risk of hail, so please be careful when managing crops and agricultural facilities.

[Severe weather changes] Rain will spread from the west tomorrow (Friday); stormy weather will return to northern Japan on Saturday and Sunday

2026/03/05 14:05

It looks like spring from now on, and the weather is likely to change rapidly.



Let's first look at the wind.

Today, due to the development of a low pressure system in the east of Japan,
winds are increasing mainly in eastern and northern Japan.

Looking at the maximum instantaneous wind speed up to 11 a.m., the wind speed was 22.1 meters
at Tokyo's Haneda Airport in the morning, and 23.6 meters at Onahama, Fukushima Prefecture before noon, so strong that it was difficult to walk into the wind.

The strong winds are also affecting transportation, so please be careful when going out.


Tonight, the developed low pressure system will move away to the east of Japan.
Instead, a high pressure system is moving over the Sea of Japan.

The distance between the isobars is gradually getting wider, and
the strong winds are likely to subside at night.

However, it's spring and the weather is going to change rapidly from now on.




Looking at the forecast weather map for the night of tomorrow, the 6th (Friday), a low pressure system with a front will move into the Sea of Japan tomorrow, the 6th (Friday).

Another front is expected to stall near the Nansei Islands.

For this reason, the weather is likely to be downhill from the west as early as tomorrow.



Let's take a look at the rain forecast.

Tomorrow morning,
It is expected to start raining in Kyushu and the Chugoku region.

In Kyushu, there are yellow and orange signs, and
it seems like there will be heavy rain accompanied by thunder.

Towards noon, it will rain over a wide area of western Japan, and in the evening and into the night, it is likely to start raining in some parts of eastern Japan and the Tohoku region.

Please be careful of temporary heavy rain, lightning strikes, and gusts of wind.


Detailed weather information for each location.

Today (Thursday) in May, it will be sunny in many places on the Pacific side of western and eastern Japan.

It is expected that the wind will continue to be strong during the day
There will be a large amount of pollen.

Although there are a lot of clouds in northern Japan and Hokuriku,
we can expect sunny spells.



This is the weather for tomorrow the 6th (Friday).

Tomorrow, rain clouds will spread from the west, and there will be some places in western Japan with rain starting in the morning,
eastern Japan and Tohoku starting at night.
Please be careful of lightning and gusts of wind.
The temperature is expected to be high, and even if it rains, it won't be too cold.



Weekly forecast.
A low pressure system is expected to develop near Hokkaido on the 7th (Saturday).
It looks like the weather will be rough mainly in northern Japan through the 8th (Sunday).

There is a risk of another strong wind storm, so caution and vigilance are required.

And from next week onwards, it looks like it will be sunny in many places, especially on the Pacific side.
It looks like snow in Hokkaido and Hokuriku will continue until around Tuesday next week in many places.

2026/03/05 14:05

[Ocean Summary] Sea surface temperature in the Sea of Japan is 4c higher than normal in the east of Kanto from February 22 to 28, 2026

2026/03/05 11:28

Near Japan, there was a day when the gradient of atmospheric pressure became large around low pressure systems and fronts, and the sea turned into a barge in the Sea of Japan.
Also, to the east of the Kanto region, sea surface temperatures were significantly higher than normal, expanding to an area that was up to 4 C higher than normal.
Below is a summary of the ocean (February 22-28, 2026)



#Pressure distribution and waves
On the 22nd and 23rd, a low pressure system accompanied by a front moved northeast over Northeastern China and Primorye.
The waves were rising in the northern and central parts of the Sea of Japan, and the waves were gradually getting louder.
On the 23rd, wave heights reached 5m in western Hokkaido, and waves also increased in the south and east of Japan.
On the 24th, the atmospheric pressure gradient increased between the high pressure area near the Korean Peninsula and east of Japan and the low pressure system in Siberia, and high waves continued in the west of Hokkaido.
On the 25th, a front passed from the East China Sea to the southern coast of Honshu and extended to the east of Japan, and a low pressure system moved eastward along the eastern coast of Kyushu and east of Japan.
The waves rose in the waters around Kyushu.
From the 26th to the 28th, a low-pressure system off the coast of Kanto moved northeast to the east of Japan, and waves rose from the south of Japan to the east of Japan, and on the 26th it broke off the coast of Kanto, on the 27th from the east of Kanto to off the coast of Sanriku, and on the 28th off the coast of southeastern Hokkaido.



#Sea surface temperature
Sea surface temperatures in the Japanese waters expanded to areas where they were slightly higher than normal in the northern and western regions.
In the East China Sea, the sea area continued to be slightly higher than normal, while the sea area near the Nansei Islands continued to be near normal.
South of Japan is at normal levels, and off the coast of the Tokai region, areas slightly lower than normal have shrunk.
To the east of the Kanto region, sea areas with significantly higher than normal temperatures expanded, with temperatures up to 4 C higher than normal.
Offshore Sanriku continued to be slightly lower than normal.
The temperature off the southeast coast of Hokkaido was higher than normal, up to 3c higher.
Sea ice was stagnant in the waters near Chishima and the Sea of Okhotsk.

Weather for the week: The weather will be downhill from the west on the 6th (Friday); there is a risk of stormy weather in Hokkaido on the 8th.

2026/03/05 07:23

This weekend, a low pressure system will move through the Sea of Japan, and a front extending from the low pressure system will pass near Honshu. Please be careful of stormy weather in Hokkaido from around the 8th to 9th, with rain and thunderstorms increasing temporarily.



The next front or low pressure system is expected to approach from the west tomorrow, the 6th (Friday). In the Nansei Islands, please be aware of heavy rain with thunder in the Sakishima Islands from early morning until dawn. In western Japan, there will be places in northern Kyushu where it will start raining in the morning, and there will also be places in the Chugoku, Shikoku and Kinki regions where it will rain in the afternoon.
Warm, humid air will move towards fronts and low pressure systems, making it easier for rain clouds to develop, so there is a risk of localized thunderstorms and heavier rainfall. Please be careful of sudden rain that falls in a short period of time, and strong gusts of wind such as lightning and tornadoes.

The next day, on the 7th (Saturday), the low pressure system will develop and move northeast across the Sea of Japan, and the area of rain will shift to northern and eastern Japan.
In areas on the Pacific coast, even if it rains, it will be temporary and will not last long. Meanwhile, on the Sea of Japan side, cold air will move south due to the influence of a low pressure system, and there will be places in Tohoku and Hokuriku where the rain will turn to snow by the 8th (Sunday). It will continue to snow in Hokkaido, and around the 8th and 9th there is a risk of strong winds and rough weather, so please be careful.

After the front leaves Honshu, there will be many sunny days in western and eastern Japan, especially on the Pacific side, and daytime temperatures are expected to remain near normal in many places. From Kyushu to Tohoku, cedar pollen tends to fly on sunny days. Especially after the weather improves, the amount of hay fever may increase rapidly, so those who are sensitive to hay fever should take precautions against hay fever.

Tomorrow, the 5th (Thursday), snow and rain in northern Japan will mainly occur in the morning. Temperatures will rise from the Kanto region to the west. Be careful of the amount of cedar pollen scattered.

2026/03/04 21:18

Tomorrow, the 5th, the low pressure system moving over the sea east of Japan will continue to develop, and strong winds will continue from northern Japan to the Pacific side of eastern Japan.

Northern Japan will experience snow and rain mainly in the morning. Winds are strong, especially on the Pacific side, and people on the Pacific side of Hokkaido need to be careful of blowing air in the morning.



As the low pressure system gradually leaves the vicinity of Honshu, snow and rain in northern Japan are expected to gradually stop in the afternoon. However, on the Pacific side of northern and eastern Japan, rough conditions are expected to continue with swells. Please be careful of strong winds and high waves.

The area west of the Kanto region will be covered in high pressure and will have sunny skies in many places. Many places will be cold in the morning, but the sun will shine brightly during the day, and the temperature will rise significantly.

However, cedar pollen is easy to fly, and it is reaching its peak in many places. Please take precautions against hay fever by wearing masks and glasses when going out.