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.

Today, the 18th (Tuesday), it's snowing and raining on the Japan Sea side, and temperatures are dropping nationwide

2025/11/18 08:11

Today, the 18th (Tuesday), the area around Japan has a winter-like atmospheric pressure pattern of high in the west and low in the east, and strong cold air is flowing into the sky above
.



In Hokkaido, the expected amount of snowfall from 6:00 on the 18th to 6:00 on the 19th is expected to be 30 cm
in the northern part of Hokkaido on the Sea of Japan side, and 30 cm
in the southern part of Hokkaido on the Sea of Japan side.
Please be careful of traffic obstructions caused by heavy snow, blowing snow, and snowdrifts.



In addition, snow is expected to fall on the Sea of Japan side of the Tohoku region, and also along the mountains of Tohoku and Hokuriku. Rain predominates in the flatlands of the Hokuriku and San'in regions, but the atmospheric conditions are extremely unstable, so you need to be careful of lightning, tornadoes, and sudden heavy rain.



On the Pacific side of eastern and western Japan, clouds are likely to spread and cold northerly winds are expected to blow
, and temperatures are expected to take a turn from yesterday. Please take measures to protect yourself from the cold.

Tomorrow, the Leonid meteor shower will be at its peak!! The influence of moonlight will be small and the conditions will be favorable. What's the weather like

2025/11/17 12:41

#The Leonid meteor shower is at its peak!! The effect of moonlight is small and favorable conditions
Tomorrow, the 18th (Tuesday) at 3 a.m., the activity of the Leonid meteor shower will be at its maximum.
Observations will be possible from 11:00 pm today, the 17th (Monday) when the radiant will rise, until dawn on the 18th (Tuesday).
The best time to see it is before dawn on the 18th (Tuesday), and the maximum time of the Leonid meteor shower is around 3:00 am.
Around 4 a.m., a thin moon will rise, but the moonlight will have little effect on it, so it will be observable under favorable conditions.
According to the National Astronomical Observatory of Japan, the number of meteors is about 5 per hour.
The radiant will rise in the eastern sky, but meteors will flow not only in the east, but in all directions throughout the sky.



#What's the weather like
Today, the 17th (Monday), a low pressure system is moving eastward over the Sea of Okhotsk, and a cold front is passing through northern Japan and extending into the Sea of Japan.
There are places where it is snowing and raining in Hokkaido and raining in Tohoku.
The area around Honshu is covered with high pressure and the sun is shining.
After this, the high pressure system is expected to gradually move away from Japan.
The low pressure system corresponds to a cold vortex in the upper atmosphere and will rapidly develop as it moves through the Sea of Okhotsk, and the front will pass over northern and western Japan into tonight.
A winter-like atmospheric pressure pattern is expected to occur, with high in the west and low in the east, mainly in northern and eastern Japan until tomorrow, the 18th (Tuesday).



In the early morning hours of the 18th (Tuesday), the best time to see the meteor shower, there will be more snow on the Sea of Japan side of Hokkaido, but the Pacific side will be clear for observation.
Tohoku and Hokuriku will be covered in clouds, snow and rain will fall on the Sea of Japan side of Tohoku, and rain and snow will fall on Hokuriku, making observation difficult.
It is expected that there will be a lot of clouds in Kanto-Koshin and Tokai areas, but in the inland areas, the clouds will clear and there will be good opportunities for observation.
There are many clouds in the Kinki and Chugoku areas, and it will rain on the Sea of Japan side, making observation difficult.
Shikoku will also be covered in clouds, but in some areas you may be able to see through the gaps in the clouds.
The chances of observation are high in Kyushu, but rain clouds will spread over the Nansei Islands, making the sky conditions unlucky for observation.

Today, the 17th (Monday), a rapidly developing low pressure system will lead to a winter-like atmospheric pressure pattern through tonight, with extremely stormy weather in Hokkaido.

2025/11/17 07:22

Today, the 17th (Monday), a low pressure system accompanied by a front is passing near Sakhalin. A cold front extending from the front is moving south across the Sea of Japan.



The low pressure system is expected to rapidly develop as it moves towards the Sea of Okhotsk, and the front will pass near Honshu tonight. After the front passes, the area around Honshu will have a winter-like atmospheric pressure pattern of high in the west and low in the east, strong cold air in the upper atmosphere will move southward, the spacing between isobars will narrow, and cold winds will blow from the north.



In Hokkaido, developed rain clouds associated with a cold front are approaching, and there will be widespread rain and thunderstorms on the Sea of Japan side in the morning. Please be careful of strong wind gusts such as lightning and tornadoes. In the afternoon, the rain will turn to snow in Hokkaido, and the wind will become stronger, causing a blizzard in some places. Please be careful of the increasing snowfall and be wary of strong winds at night.

The front will pass through Honshu in the afternoon, bringing rain and thunderstorms to Tohoku, Hokuriku, and the Sanin area. There will be localized thunderstorms, and depending on the degree of development of the rain clouds, it is likely that violent gusts such as tornadoes may occur, as well as hail and hail. There will be places where it snows at night along the high mountains from Tohoku to the San'in region.

The Pacific side of eastern and western Japan is expected to be sunny in many places, and daytime temperatures will be around 20c. However, the night is expected to be colder in some places than in the morning due to the influence of cold winds from the north. Take measures to protect yourself from the cold so you don't lose your health.

From the 17th (Monday) tomorrow, northern Japan will experience severe storms. From the 18th tomorrow, there will also be snowfall along the mountains of eastern and western Japan.

2025/11/16 20:52

Tomorrow, the 17th (Monday), a low pressure system accompanied by a front will continue to develop and move from the Sakhalin area toward the Sea of Okhotsk. A cold front extending from the center of the low pressure system moves southward near Honshu, causing the weather to deteriorate from western Japan to eastern Japan on the Japan Sea side. In northern Japan, the isobar lines are closely spaced, and there is a risk that winds from the northwest to west will become stronger, resulting in storms.



In Hokkaido, the rain will gradually turn to snow from the afternoon of the 17th tomorrow, and the wind will become stronger, causing a blizzard in some places. Please be aware of poor visibility and traffic obstruction due to snowstorms.



The next day, the 18th (Tuesday), the area around Honshu will have a winter-like atmospheric pressure pattern of high in the west and low in the east, and strong cold air with temperatures below -6 C at an altitude of approximately 1500 meters is expected to move southward into eastern and western Japan. In northern Japan, very strong cold air is expected to flow in at this time of year, with temperatures below -12 degrees Celsius, which is a guideline for heavy snow even in flat areas. In northern Japan, there is a possibility of heavy snow not only along the mountains but also on the flatlands.



On the Sea of Japan side from the southern Tohoku area to the Sanin area, winds will collide near the pressure trough (red dashed line in the diagram) that forms in the Sea of Japan, and rain clouds will develop, resulting in rain and thunderstorms. Depending on the degree of development of the rain clouds, lightning strikes, strong wind gusts such as tornadoes, and hail may occur, so please be careful.
Along the mountains, there will be snow due to the strong cold air above, and there will be snowfall in some places. It will be snowing in the flatlands of Tohoku and Nagano Prefectures, and in the high altitudes of the Chugoku Mountains, and it will likely be the first snow in some places.



It looks like there will be places along the mountains from Tohoku to western Japan that will experience the first snowfall of the season. When driving on mountain passes, be sure to wear winter tires and drive safely.