Winter type atmospheric pressure pattern does not last long; dry with little rain; be careful with fire; high temperatures trend in northern Japan [1-month forecast]

2025/11/20 16:42

Today, the 20th (Thursday), the Japan Meteorological Agency announced the weather forecast for the next month (11/22 to 12/21).
The average sea level pressure for the next month is expected to be lower than normal over mainland China, and the Siberian high is expected to be weak near the Sea of Japan.
For this reason, the winter-type air pressure distribution will not last long and will be less affected by cold air.
In addition, the atmospheric pressure is higher than normal from the East China Sea to the southeast of Japan, and it is expected that a mobile anticyclone will likely cover eastern and western Japan.
The temperature at an altitude of approximately 1,500 meters is predicted to be higher than normal, mainly in northern and eastern Japan, as the cold air is weakly moving southward.



#Temperature over the next month (11/22 - 12/21)
As it is less affected by cold air, the temperature over the next month will be high in northern Japan, and at or above normal in eastern Japan.
Western Japan and Okinawa/Amami are expected to be at normal levels.
The first week, from November 22nd to November 28th, is expected to be high in northern Japan, and eastern Japan is expected to be near normal or above average.However, in the second week, from November 29th to December 5th, it is expected to be near normal in northern and eastern Japan as well.
In northern and eastern Japan, it seems like the weather will suddenly get colder in December.
Also, on sunny days covered by high pressure, the mornings and evenings become colder due to radiation cooling.
Please take care of your physical condition as the temperature difference between morning and evening and during the day is large.



#Precipitation and snowfall for the next month (11/22-12/21)
As there are periods when the area is easily covered by a mobile anticyclone and is less affected by the winter pressure distribution, 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.
There are many sunny days and the air tends to be dry, so please be careful when handling fire and preventing infections.
The amount of snowfall over the next month is expected to be low on the Sea of Japan side of northern and eastern Japan.
However, the winter-like atmospheric pressure pattern may temporarily strengthen, causing stronger snow and increased snowfall.



#Sunshine hours for the next month (11/22-12/21)
The sunshine hours for the next month will be high on the Pacific side of eastern Japan and western Japan, and will be at or above normal on the Pacific side of eastern Japan and the Sea of Japan side of eastern Japan.

# Weather for the next month (11/22 - 12/21)
On the Sea of Japan side of northern Japan, there are expected to be fewer cloudy, snowy, or rainy days compared to normal years.
The Sea of Japan side of eastern and western Japan will have fewer cloudy, rainy, or snowy days than normal.
The Pacific side of northern and eastern Japan is expected to have more sunny days than normal.
On the Pacific side of western Japan, the weather changes every few days, but there will be more sunny days than normal.
Okinawa/Amami is expected to have many cloudy and rainy days, similar to normal years.

What's the weather like for the last three-day weekend of this year Stormy weather again after the holidays [Weekly weather]

2025/11/20 12:08

I think many people will have a three-day holiday from November 22nd (Sat) to 24th (Monday, substitute holiday), but this will be the last three-day holiday of the year.

So, what will the weather be like during the holidays


#Kesa is getting colder, and the first snow has fallen in Mito#

Kesa has become colder due to the strong cold air that has been flowing into the sky since yesterday, November 19th (Wednesday) and
radiant cooling.

Kesa observed the first snow in Mito, 29 days earlier than normal.
This is the first time this season's first snow has been observed in the Kanto region.



The strong cold air in the sky will leave tonight, but a new low pressure system with a front will approach northern Japan,
and the weather is expected to go downhill again.

#Rain and snow will return to northern Japan and Hokuriku tomorrow#

Rain and snow will fall in northern Japan tonight and into tomorrow,
The intensity of the rain will increase in some places, accompanied by thunder.

In Yamagata and Niigata prefectures, if the rain clouds become more stagnant than expected,
there is a risk of warning-level heavy rain.

Also, due to the temporary influence of cold air,
rain during the day tomorrow will turn to snow in Hokkaido and other areas at night.

On the other hand, many places on the Pacific side of western and eastern Japan will have sunny skies,
and the air will continue to be dry. Please be careful when handling fire.




#The first half of the holidays is a good day for going out and going on excursions#

From November 22nd (Sat) to November 23rd (Sunday, Labor Thanksgiving Day), it is expected to be covered by an anticyclone and clear skies mainly on the Pacific side.
On the Sea of Japan side, snow and rain only last for a short time, so you can enjoy going out and going on vacations.

In the mornings and evenings, radiation cooling becomes stronger and it gets colder, but
during the daytime, the temperature is typical of this time of year and you can feel the warmth of the sun.

However, on the 24th (Monday, a substitute holiday), the last day of the long weekend,


The high pressure system will move away to the east and moist air will flow in, so it is likely to be cloudy and rainy in many places.

It looks like there will be a lot of rain, especially around the Sea of Japan, so
it would be a good idea to bring rain gear when you go out.



#At the beginning of the week, the weather will be rough again#

Around the 25th (Tuesday), after the holidays, a low pressure system will develop
as it moves from the Sea of Japan to the vicinity of Hokkaido, so
there is a risk of strong rain and winds mainly on the Sea of Japan side of northern and eastern Japan, resulting in rough weather.
The wind will also be strong on the Pacific side.

Cold air will flow into the sky on the 26th (Wednesday),
It will snow in northern Japan, and there will likely be snow in some places in the high mountains of eastern Japan.

After that, low pressure systems often pass through, and it rains every few days, but
temperatures change gradually, and the path to winter seems to be slow.

While northern Japan is experiencing midwinter cold, Okinawa continues to experience midsummer days. Due to Typhoon No. 26, Okinawa experienced record heavy rain (Weather Summary November 9th to November 15th, 2025)

2025/11/20 06:50

This is a summary of the weather for this period (November 9th to November 15th, 2025).

#Summary of the weather for this period (November 9th to November 15th)
The average temperature was due to the strong cold air moving southward due to the winter-like atmospheric pressure distribution, resulting in midwinter cold in northern Japan, mainly in Hokkaido, and in places such as Abashiri, it was nearly 1 C below normal. On the other hand, Okinawa, Amami, and Kyushu are susceptible to the effects of warm air from typhoons and cyclones, and temperatures tended to be higher than normal.

Record heavy rainfall occurred in Okinawa and Amami, which were affected by Typhoon No. 26 and the front, and the total precipitation for the period was significantly higher than normal. On the other hand, although there were periodic weather changes around Honshu, the Pacific side of northern Japan was not particularly susceptible to the effects of low pressure systems and fronts, resulting in precipitation well below normal.

Sunshine hours tended to be higher than normal on the Pacific side of northern Japan, which was less susceptible to the effects of low pressure and fronts, and below normal on the Sea of Japan side of Hokkaido, southern Kyushu, and Okinawa/Amami, which were more susceptible to the effects of low pressure and fronts. In many places, temperatures in eastern and western Japan were at or slightly below normal.



[About this period's weather]
#Characteristics of pressure distribution
On the 9th, a low pressure system accompanied by a front moved northeast across the Sea of Japan, and another low pressure system accompanied by a front moved eastward from northern Kyushu to the southern coast of Honshu. Typhoon No. 26 passed near the Philippines. On the 10th, two low pressure systems accompanied by a front moved over the Sea of Okhotsk and east of Japan, forming a winter-like pressure pattern around Honshu. The front is stationary from the east of Japan near the Nansei Islands. On the 11th, the winter-like atmospheric pressure pattern continued around Honshu, and the front remained stationary from the east of Japan to the vicinity of Taiwan. Typhoon No. 26 is heading north in the South China Sea. On the 12th, high pressure became dominant near Honshu, and the winter-like pressure pattern loosened. The front has stalled in the Nansei Islands, and Typhoon No. 26 is moving northeast near the Bashi Strait. On the 13th, Typhoon No. 26 became an extratropical cyclone, merged with a front, and moved northeast through the East China Sea. A low pressure system accompanied by a front passes near Sakhalin. On the 14th, a low pressure system accompanied by a front moved over the Sea of Okhotsk, and a low pressure system accompanied by a front moved eastward over the sea south and east of Japan. A winter-like pressure pattern briefly formed near Honshu, but on the 15th, high pressure became dominant, and the winter-like pressure pattern loosened.

#Precipitation
On the 9th, the area of rain expanded due to the influence of two low pressure systems that were developing and moving near Honshu. In the Izu Islands, heavy rain of 39.5 mm/h was observed on Miyakejima at night. On the 10th, a winter-like atmospheric pressure pattern strengthened, bringing rain and snow mainly from northern Japan to Hokuriku on the Japan Sea side. In Sukayu, Aomori Prefecture, 10 cm of snowfall was recorded in 3 hours. On the 11th, due to the moist air from Typhoon No. 26 and the influence of the front, heavy rain is believed to have fallen in the eastern part of Kunigami Village, Okinawa Prefecture, with an hourly rainfall of about 110mm, and information on heavy rain in a record time was announced. First snow observed in Kushiro and Aomori. On the 12th, rain continued in the Okinawa area due to the influence of the humid air around the typhoon. Heavy rain of 47.0mm/h was observed on Kumejima, Okinawa Prefecture. On the 13th, it rained widely in southern Kyushu and Okinawa due to the influence of an extratropical cyclone that changed from Typhoon No. 26. The 72-hour precipitation on Kumejima reached 416.5mm, breaking the record for November. On the 14th, a winter-like atmospheric pressure pattern brought rain and snow from northern Japan to the San'in area on the Sea of Japan side. On the 15th, the winter-like atmospheric pressure pattern loosened, and it rained in Ama, Oki District, Shimane Prefecture, and Hachijo Island, and there was almost no noticeable precipitation near Honshu.

#Temperature
On the 9th, the temperature did not rise in eastern Japan due to the cold rain. The highest temperature in central Tokyo was 13.7c, which was observed in the early morning hours. Meanwhile, Naha City and Miyakojima recorded their first midsummer day this month. On the 10th, temperatures in northern Japan dropped from the previous day as cold air moved south. Sunshine has reached the Kanto region, and the highest temperature in central Tokyo is 20.7 C, nearly 7 C higher than the previous day. On the 11th, cold air brought winter chill to the Sea of Japan and Okhotsk sides of northern Japan, and it was midwinter in Shirataki, Engaru Town, Hokkaido, Yubari City, and Sukayu, Aomori Prefecture. On the 12th, it was extremely cold in the morning due to radiation cooling, and the lowest temperature in the morning in central Tokyo was 8.1c. On Kumejima, the maximum temperature is 30.0c, the latest midsummer day. On the 13th, Naha City recorded the second-latest midsummer day on record due to warm air. Temperatures in eastern Japan are dropping due to cold winds blowing from the north. On the 14th, temperatures in western and eastern Japan, covered by high pressure, were similar to October. Northern Japan is getting colder due to the effects of cold air, with the highest temperature in Sapporo being 6.0c. On the 15th, temperatures rose in western and eastern Japan with mild, sunny skies. Northern Japan continued to be cold.

Tomorrow, the 20th (Thursday), it will be very cold in the morning, with rain and thunderstorms in the evening in northern Japan.

2025/11/19 20:04

Tomorrow, the 20th (Thursday), the area around Honshu will continue to be covered by high pressure overhanging from the west. However, a low pressure system is expected to form near the Izu Islands by morning. In northern Japan, the weather will turn downhill as a front approaches through the night.

The minimum temperature tomorrow morning will not reach 10c in many places, so it will be very cold. The minimum temperature in Nagoya tomorrow morning is expected to be 4c, and in Osaka it will be 6c, which will be lower than the minimum temperature today, the 19th (Wednesday) morning. It looks like some places will experience the coldest weather of the season. Please take care of your health. During the day, the sun will shine and the cold will subside in many places.

In the morning, clouds will spread over the Kanto coast and the Izu Islands, and there may be a chance of temporary rain. It won't last long though, by the afternoon the rain will stop and the sun will return.

Western to eastern Japan will be sunny and dry during the day, especially on the Pacific side. Please be careful when handling sources of fire as this may easily cause a fire.



From around the evening, a cold front is expected to extend into the Sea of Japan and pass through northern Japan into the evening. As a result, there will be rain and thunderstorms mainly on the Sea of Japan side of northern Japan. Depending on the degree of rain cloud development, severe gusts of wind such as lightning and tornadoes may occur, so please be careful. In areas with heavy snowfall, be careful of avalanches and landslides caused by rain.

stop!大規模火災 この先の｢乾燥+強風｣の日は?

2025/11/19 16:07

A large-scale fire has been occurring in Saganoseki, Oita City since the evening of yesterday, November 18th (Tuesday), and more than 170 homes and other buildings have been burned, and firefighting efforts are still continuing today, a full day later.



According to the Tokyo Fire Department's ``2020 Fire Situation (Final Edition)'' data, the monthly occurrence of fires shows that for general fires, excluding arson, the number of fires increases from winter to spring, from December to May.

Winter and early spring tend to have a winter-like pressure distribution,
northern winds (monsoon winds) often become stronger.
In early spring, developed low pressure systems tend to pass near Japan,
and spring storms (storms) occur almost every year.
Once a fire breaks out, it is more likely to spread and spread.

Also, during the winter on the Pacific side, there is less snow and rain,
less rainfall and dry air, making it easier for fires to spread.

In fact, the large-scale fire that occurred in Itoigawa City in December 2016, which is still fresh in our memories, occurred on a day when the air was dry and strong winds were blowing.



According to the data in the ``2020 White Paper on Fire Services'' by the Fire and Disaster Management Agency of the Ministry of Internal Affairs and Communications,
looking at the number of fires by main cause during 2020,
1st place was cigarettes, 2nd place was bonfires, 3rd place was stoves, and 4th place was arson.



Looking at the weather this week,
the Pacific side will continue to be sunny and dry.

In terms of weather conditions, the days when you need to be especially careful about strong winds and dry weather are from the 25th (Tuesday) to the 26th (Wednesday).

A developing low pressure system will pass near northern Japan,
and winds are expected to increase across the country.

Due to the effects of low pressure and fronts, it will rain widely on the Sea of Japan side, but on the Pacific side, the double punch of dry air and strong winds will make fires more likely to spread.

Please be careful when disposing of ``cigarettes'' and ``bonfires,'' and
when handling sources of fire such as stoves.

[Ocean Summary] The East China Sea is affected by Typhoon No. 26, and a low pressure system rapidly develops in the Sea of ??Okhotsk, causing a major disturbance in the Sea of ??Okhotsk (November 9th to 15th, 2025)

2025/11/19 15:05

The East China Sea has been in a state of turmoil due to Typhoon No. 26.
Also, a low-pressure system rapidly developed in the Sea of Okhotsk, causing a major disturbance there.
Below is a summary of the ocean (November 9th to 15th, 2025)



#Pressure distribution and waves
Typhoon No. 26 was large and very strong on the 9th as it moved eastward east of the Philippines and passed through Luzon Island.
On the 10th, a large and strong force reached the South China Sea.
On the 11th and 12th, it headed north through the South China Sea, and on the 12th and 13th, it proceeded from Taiwan to the East China Sea.
At 9 a.m. on the 13th, it turned into an extratropical cyclone near Yonaguni Island.
There was a barge in the sea near the Sakishima Islands and in the East China Sea, and on the 13th there was a barge in the East China Sea, and there was a barge in the sea from Okinawa main island to Amami.
On the 14th, swells remained in the sea near Okinawa and it was rough.
Also, from the 10th to the 11th, a low-pressure system developed rapidly in the Sea of Okhotsk, and on the 11th there was a major depression in the Sea of Okhotsk, followed by a barge on the 12th.
On the 14th, the atmospheric pressure around Japan was high in the west and low in the east, and the sea area around Hokkaido was affected.



#Sea surface temperature
Sea surface temperatures in the Japanese waters continued to be lower than normal in the northern part, and were considerably higher than normal in the central part.
In the western part of the country, areas of higher than normal sea areas have expanded.
The East China Sea continued to be at normal levels.
On the Pacific side, sea conditions were below normal in the south of Japan, and waters near the Izu Islands and east of Kanto continued to be below normal.
To the east of Japan, sea areas continued to be significantly higher than normal, with temperatures up to 3 C higher.
Off the coast of Sanriku, sea areas that are lower than normal have spread.
The sea level off the southeastern coast of Hokkaido was significantly lower than normal, and the Sea of Okhotsk was near normal.

Today's weather on the 19th (Wednesday): The weather is gradually improving on the Sea of ??Japan side, with cold weather everywhere

2025/11/19 06:21

Today, the 19th (Wednesday), high pressure is expected to emerge from the west, and the winter-like pressure pattern is expected to gradually loosen. It will be rain and snow on the Sea of Japan side mainly in the morning, but the area of rain and snow is expected to gradually decrease in the afternoon.
It will be a cold day across the country.



It will rain and snow on the Sea of Japan side from northern Japan to western Japan until the morning, but the weather is expected to gradually improve in the afternoon. The snow from yesterday has frozen the roads in some places, so please be careful where you step when commuting to work or school.

It will be sunny in many places on the Pacific side of northern Japan and on the Pacific side west of Kanto. As the effects of the cold air remain, the daytime will also be cold, with temperatures likely to be similar to early December in many places. Please be sure to protect yourself from the cold.

The sky in Okinawa is not clear. It's a good idea to bring rain gear such as a folding umbrella when going out.

Tomorrow, the 19th, it will get colder and the temperature will be like early winter. Tokyo is expected to have a minimum temperature of 6 degrees Celsius. Temperatures will continue to rise slowly during the day.

2025/11/18 18:39

Today, the 18th, the winter-like atmospheric pressure pattern has strengthened, and due to the influence of cold air flowing into the upper atmosphere, the temperature did not rise during the day, and many places experienced early winter cold, similar to December.



The effects of the cold air will remain into tomorrow, the 19th, and the morning is expected to get colder.
The expected minimum temperature is -2c in Sapporo, 2c in Sendai, 6c in Tokyo, 5c in Kanazawa, 6c in Nagoya, 9c in Osaka, 6c in Kochi, and 7c in Fukuoka, which will be lower than this morning and will be the coldest of the season in some places. Please be careful when driving along high mountains, as roads may become icy.



The temperature will rise slowly during the day, and temperatures are expected to be similar to early December in many places.
The predicted maximum temperature is Sapporo: 3c, Sendai: 10c, Tokyo: 13c, Kanazawa: 11c, Nagoya: 14c, Osaka: 13c, Kochi: 15c, Fukuoka: 13c.
The air can feel cool even on the sunny Pacific side, so please take proper measures to protect yourself from the cold.

Warning of high waves due to swells in Okinawa tomorrow

2025/11/18 15:51

Today, the 18th (Tuesday), a developed low pressure system is moving eastward near the Chishima Islands, and a continental high pressure system is protruding near Japan.
The area around Japan has a winter-like atmospheric pressure pattern of high in the west and low in the east.



Although the peak of snow and wind has passed in Hokkaido, there are places where heavy snow and blizzards are occurring.
As of 3:00 p.m., a wave warning has been issued for the Nemuro and Abashiri regions of Hokkaido.
Please be careful of high waves until dawn on Wednesday the 19th.
A heavy snow warning has been announced for Tsugaru and Sanyachi Kamikita in Aomori Prefecture.
Please be careful of heavy snow until the evening of today, Tuesday the 18th.

Even in the Okinawa region, the gradient of atmospheric pressure is increasing due to the protrusion of the continental high pressure system.
In Tokorino, Yonaguni Town, Okinawa Prefecture, a maximum wind speed of 18.1 m/s was observed at 9:05 a.m., and a maximum instantaneous wind speed of 23.1 m/s was observed at 10:26 a.m.
Also, as of 3 p.m., a wave warning has been issued for the Yaeyama region.



The Yaeyama region is expected to experience heavy swells through tomorrow the 19th (Wednesday).
Please be careful of high waves.
In the Okinawa main island region and Miyakojima region, please be careful of high waves until tomorrow the 19th (Wednesday).
The main island of Okinawa and the Sakishima Islands need to be careful of strong winds until tomorrow the 19th (Wednesday).

#Wave height expected for tomorrow, the 19th (Wednesday)
Okinawa main island region 4m with swells
Daitojima region 3m
Miyakojima region 5m with swells
Yaeyama region 6m with swells

#Forecasted wave height for tomorrow 20th (Thursday)
Okinawa main island region 2.5m
Daitojima region 3m
Miyakojima region 3m
Yaeyama region 3m With swells

# Maximum wind speed (maximum instantaneous wind speed) expected for tomorrow 19th (Wednesday)
Miyakojima region 15m/s (25m/s)
Yaeyama region 17m/s (30m/s)

``Winter Storm'' Northern Japan warns of strong winds, heavy snow, and blizzard. How long will the impact last What's the weather like for the three-day weekend [Weekly weather]

2025/11/18 12:01

In mid-November, cold air comparable to midwinter is flowing in, creating a ``winter storm'' mainly in northern Japan.

The cold air this time will not last too long and will pass by the night of the 19th (Wednesday), but
there will be heavy snow and blizzard on the Sea of Japan side, and cold winds will blow on the Pacific side as well,
making it temporarily cold in December.
Please be careful not to get sick due to the temperature difference.



Let's take a look at the clouds using the Himawari meteorological satellite.

Today, November 18th (Tuesday), the winter-like atmospheric pressure pattern is strengthening,
with strong cold air flowing into the sky.

The sea of Japan is covered with streaks of clouds due to the onset of cold air.
(The stronger the cold air blowout, the shorter the distance from the coast of the
continent to the clouds forming in the Sea of Japan.)

Kesa has observed the first snow in Akita,
along the mountains of Yamagata and Niigata, snow is accumulating, and in some places it is snowing for the first time this season.



Tonight's forecast for rain, snow, and wind.

The wind from the north will be stronger nationwide,
There will be snow and rain in many places in northern Japan and Hokuriku.

In northern Japan, depending on the wind direction, the snow may locally become heavier, leading to
warning-level heavy snowfall.

Be careful and be on guard against traffic disruptions due to heavy snow, poor visibility due to blizzard,
snow falling from roofs, etc.

In addition, rain and thunderstorms are expected in the flatlands from Hokuriku to the San'in region, and
snow is expected in high altitude areas.

There will be a lot of clouds on the Pacific side as well, and it will rain in Kanto and other areas, and there will be some places where it will rain occasionally.
At night, the wind from the north will be strong and it will feel quite cold.

Please stay warm.



#The first half of the holiday will be sunny, but the last day will be rainy in many places#

Even after the 20th (Thursday), low pressure systems and fronts will frequently pass through northern Japan and Hokuriku, so there will be many places with rain and snow.

During the three-day weekend from the 22nd (Sat) to the 24th (Mon), you can expect sunny skies on Labor Thanksgiving Day (Sunday) the 23rd,
which seems like the best time to go out during the holidays.

On the other hand, the Pacific side will be covered in high pressure during the holidays, and many places will be sunny.

It's cold in the mornings and evenings, but
you'll feel the warmth of the sun during the day.