New typhoons are forming as the season advances from the north; tomorrow night there is a risk of snowfall even in the flatlands of Hokkaido [Typhoon information/Weekly weather]

2025/10/18 11:59

Typhoon No. 24 (Funshen) occurred in the east of the Philippines at 3 a.m. today, October 18th (Saturday).

The typhoon is expected to advance westward as it continues to develop, and is expected to move westward around the 21st (Tuesday), accompanied by stormy winds, in the South China Sea.



Although there is no direct impact on Japan,
the autumn rain front is expected to stay near the Nansei Islands next week, and
please be aware that the front may become more active due to the influence of moist air flowing in from the typhoon.

A low pressure system accompanied by a front is passing near Honshu, and
active rain clouds are approaching from the Sea of Japan.



Looking at the state of the rain clouds as of 11 a.m. today,
band-shaped rain clouds are spreading over the Sea of Japan due to the front,
and the rain is starting to get stronger in Hokkaido and other areas.

Rain clouds will cover a wide area this afternoon
There are likely to be heavy rain and thunderstorms in western and eastern Japan.

Be careful of sudden heavy rain, lightning strikes, and strong gusts of wind such as those caused by tornadoes.



After this rain, strong cold air is expected to flow into the sky.

Looking at the forecast for cold air for three days from today, the 18th (Saturday),
today, warm air similar to September will flow towards low pressure systems and fronts, but
tomorrow, the 19th (Sunday), cold air that will bring snow in the mountains
will flow into the northern Tohoku region.

Additionally, by Monday the 20th,
cold air that brings snow on the flatlands will move south to southern Hokkaido,
on the northern Sea of Japan side of Hokkaido and the Sea of Okhotsk side,
even on the flatlands are expected to experience snowfall in some places.

Please use winter tires and be careful of
traffic hazards caused by snow and frozen roads.



An anticyclone is expected to protrude from the continent next week, and the
autumn rain front is expected to stay on the southern coast of Honshu.

As a result, rain will continue to fall near the Nansei Islands and Izu Islands, with the possibility of
warning-level heavy rain.

It is necessary to be careful and vigilant against heavy rain disasters caused by long rains.



The season will take a big step forward this weekend.
The maximum temperature in Sapporo on the 20th (Monday) is expected to be 9c, and on the 21st (Tuesday), Tokyo is expected to reach 19c and 20c.

Even in Western Japan, which has been experiencing high temperatures until now, there will be fewer days where temperatures reach 25c next week.

There will be many days when it will be cold in the mornings and evenings, so
Please be careful not to get sick due to the temperature difference between morning and evening and daytime, as well as the daily temperature difference.

Typhoon No. 24 (Funshen) occurs. Although there is no impact on Honshu, there is a possibility of heavy rain in Okinawa

2025/10/18 06:11

At around 3:00 a.m. on the 18th (Saturday), Typhoon No. 24 "Funshen" formed off the eastern coast of the Philippines. This will be the fourth typhoon since October.

#Typhoon No. 24 Saturday, 18th as of 3:00 a.m.
==================
Center location East of the Philippines
Movement speed West 25km/h
Central pressure 1000h Pa
Maximum wind speed 18m/s (near the center)
Maximum instantaneous wind speed 25m/s
==================

Typhoon No. 24 is expected to pass through the Philippines and reach the South China Sea. There is no direct impact on areas near Japan.



However, Okinawa and the Sakishima Islands may be affected by the warm and humid air from the typhoon. From now on, the front is likely to remain stationary near Okinawa, and warm, humid air from the typhoon may flow in, causing heavier rain. Please pay attention to the latest weather information that will be updated in the future.

Latest 1-month forecast: The season is rapidly advancing in northern Japan. The season is progressing slowly in eastern and western Japan.

2025/10/17 20:43

On the 16th, the Japan Meteorological Agency announced the latest one-month forecast, which provides the weather outlook for the next month.



According to the numerical forecast, the Siberian High is expected to protrude from the continent, while the average pressure is expected to be low near Okinawa.
The average temperature at around 1,500 meters above sea level is expected to be lower than normal in northern Japan, and higher than normal in western Japan and near Okinawa/Amami. Near Japan, the temperature difference between the north and south sides is expected to be large.



For this reason, northern Japan will be more susceptible to the effects of cold air in the upper atmosphere. During this period, strong cold air will flow into the sky, and there is a possibility that snow will fall not only along the high mountains in Hokkaido, but also on the flatlands. When driving on mountain passes, you need to be careful about the road surface conditions, so it's a good idea to consider changing to winter tires as soon as possible.
There will be more autumn-like days in the Tohoku region, and the trees will start to change color.

Eastern Japan, the Pacific side of western Japan, Okinawa and Amami will be more susceptible to the effects of low pressure systems and fronts, and will have many cloudy and rainy days. Precipitation in Okinawa and Amami is likely to be around or above normal.
From next Tuesday, the 21st, there will be days in eastern and western Japan where the maximum daytime temperature will not reach 20c and it will feel like autumn. However, looking at the total period, it seems likely that temperatures will continue to be higher than normal, and the season will progress slowly.
However, the temperature difference between morning and evening and daytime tends to be large, so please be careful about your physical condition.

[Typhoon No. 24 to occur] A typhoon egg is developing in the east of the Philippines. Be careful of typhoons in October as well. Tropical cyclone information

2025/10/17 11:40

At 3 a.m. today, the 17th (Friday), the Japan Meteorological Agency announced that the tropical cyclone that was developing in the east of the Philippines was ``expected to develop into a typhoon within 24 hours.''
If it develops into a typhoon as expected, it will be called "Typhoon No. 24."



#Tropical cyclone October 17th (Friday) 9:00 am
Area of existence East of the Philippines
Center location 13 30'N latitude 131 20'E
Movement West 20 km/h
Central pressure 1006 hPa
Maximum wind speed: 15 m/s (near the center)
Maximum instantaneous wind speed: 23 m/s

The tropical cyclone east of the Philippines is developing and moving westward, and is expected to become a typhoon east of the Philippines tomorrow, the 18th (Saturday).
Then, it will move west-northwest and pass the Luzon Island the next day, on the 19th (Sunday).
It is expected to reach the South China Sea on the 20th (Monday) and continue westward through the South China Sea until the 22nd (Wednesday).

#The impact on Okinawa will have no direct impact on Japan.
However, depending on the course of the typhoon and the extent of its development, there is a risk that waves may become high with swells, especially in the Sakishima Islands of Okinawa.
In addition, from the afternoon of the 18th (Saturday) tomorrow, the moist air around the typhoon will flow around the edge of the high pressure system and flow into the vicinity of Okinawa, and the rain may become heavier from the day after tomorrow until the 19th (Sunday).
The autumn rain front will remain stationary near Okinawa from the 20th (Monday) to the 23rd (Thursday), and there is a risk of heavy rain due to the front mainly from the 21st (Tuesday) to the 22nd (Wednesday).
As the rainy days continue, please be careful of the latest information.

#Typhoon could make landfall in October
If the tropical cyclone east of the Philippines becomes "Typhoon No. 24," it will be the fourth typhoon to occur this month.
The average number of typhoons in October is 3.4, and it is still a time when typhoons are likely to occur.
Also, the average number of landfalls is 0.3, and landfalls may occur in October.
It's a good idea to stay alert in October and take precautions against typhoons and heavy rain.

Weather for today, the 17th (Friday): The weather has improved. Sunshine will reach a wide area. A midsummer day is expected in western Japan.

2025/10/17 06:12

Today, the 17th (Friday), the low pressure system and front that brought widespread rain yesterday (16th) will move away to the east of Japan, and the area around Japan will be covered by high pressure.
The weather is likely to improve and it will be sunny in many areas.



Hokkaido will receive occasional sunshine, but the sky will be dominated by clouds.
There will be some lingering rain in parts of eastern Hokkaido in the morning.
During the day, the temperature is likely to be typical for this time of year.

It will be sunny in autumn from Tohoku to Kyushu. It looks like the weather will be fine for drying laundry outside.
The temperature during the day will be higher than the previous day in many places, with the expected maximum temperature being 28c in Nagoya, 29c in Osaka, and 30c in Fukuoka. In western Japan, there are places where it is midsummer, so those who are active outdoors need to take precautions against the heat.
It will be the first summer day in four days, with 25 degrees Celsius expected in central Tokyo. It can get cold in the mornings and evenings in many places, so please be aware of the temperature differences throughout the day.

Hokuriku region: Watch out for landslides and rising river waters tonight

2025/10/16 17:40

A low-pressure system is located in eastern Japan, and a front is passing through Hokuriku and the southern part of Tohoku, causing extremely unstable atmospheric conditions in the Hokuriku region.
In the hour up to 5pm, 24.5mm of heavy rain was observed in Himi City, Toyama Prefecture, and 23.5mm in Kahoku City, Ishikawa Prefecture, both of which were the worst in October.
As of 17:00, heavy rain and flood warnings have been issued in some areas of Ishikawa and Toyama prefectures.

In the Hokuriku region, rain clouds that have developed into the night are likely to form, and there will be heavy rain in some places, with more than 30mm of rain per hour accompanied by thunder.
If the rain clouds become stagnant or develop more than expected, there is a possibility that warning-level heavy rain may spread over the area.
It is necessary to be wary of landslides, rising water levels and flooding of rivers. Also, be careful of strong wind gusts such as lightning and tornadoes.
The rain clouds will gradually move eastward and will stop in many places around dawn on Friday the 17th.



#Expected amount of rain (in areas where there is a lot)
+Expected hourly precipitation for today 16th
Niigata Prefecture 40mm
Toyama Prefecture 40mm
Ishikawa Prefecture 40 mm
Fukui Prefecture 30 mm
+24-hour precipitation expected by the evening of tomorrow 17th
Niigata Prefecture 80 mm
Toyama Prefecture 50 mm
Ishikawa Prefecture 50 mm
Fukui Prefecture 50 mm

Widespread rain over the weekend Warning-level heavy rain in Hokuriku Cold air moving south after low pressure and front passes Snow expected even in flat areas of Hokkaido

2025/10/16 12:48

Weekly Weather Forecast
#Low pressure system develops today, very heavy rain like waterfalls possible in Hokuriku
#Low pressure system develops again over the weekend, leading to widespread rain as a front passes through Hokuriku warning-level heavy rain
#After low pressure and front passage, northern Japan enters winter-type atmospheric pressure pattern Snow in Hokkaido
#Next week Tokyo will continue to have days below 20 degrees Celsius; western and eastern Japan will also feel like autumn at once





#Today, there is a risk of extremely heavy rain like waterfalls in Hokuriku
Today, the 16th (Thursday), a front is passing through the East China Sea and the Sea of Japan, extending into the vicinity of eastern Japan.
Also, a low-pressure system in the Sea of Japan on the front is moving eastward.
Tonight, the low pressure system will develop and move eastward, passing over eastern Japan and heading east of Japan.
As warm, humid air flows toward fronts and low pressure systems, atmospheric conditions will become unstable across a wide area from Kyushu to Tohoku.
In the afternoon, extremely heavy rain with thunder and lightning is expected in Hokuriku, reaching 50 mm per hour, and in southern Tohoku, heavy rain of 30 mm per hour is expected in some places.
If the rain clouds become stagnant or develop more than expected, there is a risk of warning-level heavy rain.
Please be careful of landslides, flooding of low-lying areas, and rising river waters.



#Low pressure system will develop again this weekend and a front will pass, causing widespread rain Hokuriku warning level heavy rain
On Saturday the 18th, a low pressure system accompanied by a front will develop from near the Korean Peninsula and move towards Honshu.
In addition, a low pressure system accompanied by another front is developing and moving west of Hokkaido to north of Hokkaido, and the front is expected to pass near Japan on the 19th (Sunday).
On Saturday the 18th, there will be sunshine in some parts of the Kanto region, but rain will gradually increase in other parts of the region.
On the 19th (Sunday), rain is expected to fall widely, including in the Kanto region.
In particular, the Hokuriku region will experience heavy rain this weekend due to the influence of a front, and depending on the front's activity, there is a risk of warning-level heavy rain.



#After the passage of a low pressure system and front, the atmospheric pressure pattern becomes winter-like in northern Japan. Will it snow in Hokkaido



A low pressure system or front will pass near Japan over the weekend, and after that, a winter-like pressure pattern is expected to occur mainly in northern Japan.
Then, cold air with temperatures below -6c will move south toward Hokkaido at an altitude of about 1,500m above where snow is expected to fall on the plains.
After that, the cold weather is expected to remain until around the 23rd (Thursday) at the earliest.
Next week, it will snow in the mountainous areas of Hokkaido, and there is a risk of snow accumulation.
Please wear winter tires when crossing the mountain pass.
There is a risk of snow even in flat areas inland.
We may also receive news of the first snowfall from the mountains of Tohoku.

#Next week in Tokyo, temperatures will drop below 20 degrees Celsius; it will suddenly feel like autumn in western and eastern Japan.
Next week, temperatures will drop in western and eastern Japan, and it will suddenly feel like autumn.
Even in central Tokyo, the maximum temperature is expected to continue to be below 20c.

Atmospheric instability, heavy rain warning especially in San'in, Hokuriku and Tohoku regions

2025/10/16 10:05

There is a low pressure system moving northeast near the Korean Peninsula, and the front is extending through the Chugoku and Shikoku regions, over the southern seas of eastern Japan, and through the Yellow Sea into central China.



Currently, clouds are spreading from Hokkaido to the Chugoku and Shikoku regions, and rain is falling in places from Kanto to Kinki and Shikoku.





Today, a developing low pressure system is expected to move eastward from the Japan Sea coast of western Japan to the Hokuriku and Tohoku regions, and the front is expected to pass through Honshu.

As a result, rain is expected to fall over a wide area from Hokkaido to northern Kyushu, with some localized areas experiencing heavy rain accompanied by thunderstorms.



There is a risk of heavy rain, especially in the San'in, Hokuriku, and Tohoku regions.
If the rain clouds become stagnant or develop more than expected, there is a possibility of warning-level heavy rain.

Please be careful of landslides and flooding of low-lying areas, and be careful of lightning and gusts of wind.

Sea surface temperature in Japanese waters is quite high, and there are concerns about the impact on heavy winter snow [Ocean summary 2025/10/5-11]

2025/10/15 14:40

Typhoons No. 22 and No. 23 have passed through the sea south of Japan one after another since the beginning of October, stirring the seawater in the Pacific Ocean and expanding areas where the sea surface temperature is near normal.

On the other hand, few low-pressure systems have passed through the Japanese waters since the beginning of this month, making it difficult for the
seawater to be stirred.

Sea surface temperatures in the Japanese waters continue to be higher than normal,
up to 4c higher.

If the sea surface temperature in the Japanese Sea continues to be quite high,
in winter, when strong cold air flows in, the warmth of the Sea of Japan and the coldness of the cold air will become more intense, making it easier for snow clouds (as well as rain clouds and thunderclouds) to develop.

This winter, starting in December, temperatures are expected to be lower than normal,
making us more susceptible to cold air.

We need to pay closer attention to the high sea surface temperatures in the Japanese waters and heavy snowfall on the Japan Sea side this winter.

Below is a summary of the ocean from October 5th to 11th, 2025.



#Pressure distribution and waves
On the 5th and 6th, Typhoon No. 22 developed near the Ogasawara Islands and slowly moved west to northwest.
The wave height was 4 to 5 meters near the center of the typhoon.

On the 6th, isobars were crowded between the high pressure system overhanging the continent and the low pressure system east of
Hokkaido.
In the waters of Japan, winds from the north prevailed and wave heights rose to 3 meters.

From the 7th to the 9th, Typhoon No. 22 was very strong and approached the Izu Islands quite a bit.
On the 9th, waves of 12m in height occurred in the Izu Islands, and the Kanto region also experienced severe flooding with a height of 7m.

In the afternoon of the 8th, Typhoon No. 23 formed in the east of the Philippines.
From the 9th to the 10th, Typhoon No. 23 approached the Nansei Islands while intensifying.

On the 11th, we gradually changed our course to the east.
On the 11th, the wave height was 4m near the Nansei Islands.





#Sea surface temperature
Sea surface temperatures in the Japanese waters continued to be significantly higher than normal,
at a maximum of 4c.
In the East China Sea, areas that are significantly higher than normal have expanded.

In the Nansei Islands, the sea area where the sea area is much higher than normal has shrunk, but
the area where the sea area is much higher than normal has continued.
On the Pacific side, areas with higher-than-normal conditions have shrunk, and
areas with higher-than-normal conditions have expanded.

Off the coast of Sanriku, the sea area was much higher than normal.
The sea area off the southeastern coast of Hokkaido continues to be lower than normal.
The Sea of Okhotsk was higher than normal, and
the coast remained fairly high.

[Autumn rain front becomes more active] Warning-level heavy rain will occur in Tohoku and Hokuriku tomorrow, and there will be "storm and snow" in Hokkaido on the weekend -Weekly weather-

2025/10/15 12:43

#Weekly Weather Points#
Tomorrow (Thursday): A low pressure system passes, causing warning-level heavy rain in Tohoku, Hokuriku, etc.
Saturday and Sunday: A rapidly developing low pressure system passes, causing a storm to rage in Hokkaido
First half of next week: Strong cold air intruding into the sky, and the first snow in Hokkaido's flatlands




Today, the 15th (Wednesday), the autumn rain front has moved down to the south coast of Honshu and is stagnant.

A low-pressure system will form on the front tonight,
The low-pressure system is expected to develop slightly until tomorrow, the 16th (Thursday), when it will pass from Hokuriku to Tohoku.

Particularly in the Tohoku and Hokuriku regions, which are close to the center of the low pressure system,
heavy rain is expected to be accompanied by thunder, and there are likely to be warning-level heavy rains in some places.


From noon until late at night on the 16th tomorrow (Thursday),
caution and vigilance is required for landslides, flooding of low-lying areas, and rising river waters.



On Friday the 17th, the low pressure system will move away to the east of Japan, but the next front or low pressure system is expected to approach from the
continent.

From the 18th (Saturday) to the 19th (Sunday), a low pressure front is expected to rapidly develop and pass near Hokkaido,
raising the risk of stronger rain and wind.

Especially in Hokkaido, which is close to the center of the low pressure system,
there is a possibility that a storm warning will be issued widely on the 19th (Sunday), and
it is likely to be very stormy weather.

Airplanes and other aircraft may be affected, so
Please pay attention to traffic information when going out.

After the low pressure system passes on the 19th (Sunday), strong cold air will flow into the upper atmosphere.

Cold air that brings snow in the mountains moves south to northern Tohoku, and
strong cold air that brings snow to the plains flows over northern Hokkaido.

The cold air is expected to remain until at least the 22nd (Wednesday), and
In Hokkaido, snow will fall next week even in flat areas.
There will be some places where the first snow will be observed.



Next week, cold air will flow in from the north,
a front will stay on the southern coast of Honshu, and there will be many cloudy and rainy days,
temperatures will continue to drop into next week.

Next week in particular, the maximum temperature will not reach 20 degrees Celsius in the Kanto region, and
it will feel like autumn is deepening all at once.

The mornings and evenings will also be cold, and the autumn leaves will continue to change in northern Japan and high altitude areas.

Until the weekend, there will be some summer days above 25c, but
the season will move forward next week.
Please be careful not to get sick due to the temperature difference.