Nagasaki Prefecture: Rising a linear precipitation zone: Go home early tonight

2025/10/03 13:00

In Nagasaki Prefecture, linear precipitation zones may occur from the beginning of the evening today, the 3rd (Friday) to the beginning of the night tomorrow, the 4th (Saturday), and the risk of heavy rain disasters will increase dramatically.
This may coincide with your return time, so be sure to get home early tonight.



A cyclone in the Yellow Sea is moving eastward, with the front extending west of Kyushu.
Active cumulonimbus clouds are occurring one after another near the front line.


Another low pressure system will occur on the front line tomorrow, the 4th (Saturday), and will proceed from the sea near Tsushima to the Sea of Japan.
As warm, humid air flows towards the front and low pressure, the atmosphere is expected to become extremely unstable in western Japan.



In particular, in northern Kyushu, there will be some places in which extremely heavy rain with thunder will fall from the evening of the 3rd (Friday) to tomorrow, the 4th (Saturday).
The 24-hour precipitation expected by noon tomorrow, the 4th (Saturday) is 180mm, the most common in northern Kyushu.
If a linear precipitation occurs, there will be more localized rainfall.
In Nagasaki Prefecture, linear precipitation zones may occur from the beginning of the evening today, the 3rd (Friday) to the beginning of the night tomorrow, the 4th (Saturday), and the risk of heavy rain disasters will increase dramatically.


In northern Kyushu, beware and beware of landslides, low-cost flooding, river flooding and flooding from today, Friday the 3rd to the beginning of the evening, tomorrow, Saturday the 4th.
Also, in western Japan, be careful of severe gusts of winds such as lightning strikes and tornadoes tomorrow, the 4th (Saturday).

Today, the 3rd (Friday) will be downhill from the west. Beware of extremely heavy rain in Kyushu tonight with thunder

2025/10/03 07:25

Today, the 3rd (Friday), the area around Honshu will be covered by mobile high pressure, but from the west of the high pressure system, a low pressure system with a front will slowly advance. With the low pressure system and the front eastward, very active rain clouds will approach from the west, and the weather is expected to fall apart, especially in western Japan.



In Kyushu, there are areas that have been raining since the morning, mainly in the north, and there are areas that will be very heavy rain in northern Kyushu with lightning until night. Beware of severe gusts of wind, such as landslides, road flooding, lightning and tornadoes.
The rain area will spread to Chugoku and Shikoku around noon, and rain is expected to fall over a wide area in Kinki and Tokai from noon to the evening. When you go out, please bring your umbrella.


In eastern and northern Japan, there are many sunny spots and sunlight. However, from the evening around Hokuriku, the sky gradually becomes cloudy and cloudy, and there will be some areas where rain will fall locally at night. In the Kanto region, there are many clouds, mainly in the southern part of the country, and there are likely some rain showers along the coast at night. If you're likely to be late on your way home, it's a good idea to go out with a folding umbrella.
Northern Japan will be steadily sunny. In Hokkaido, there are likely some areas where thick fog occurs in the morning. When driving, be careful of poor visibility.

Latest month forecast: Unusual summer is still ongoing, Hokkaido's seasons are rapidly progressing

2025/10/02 22:14

On Thursday, the Japan Meteorological Agency announced the latest one-month forecast, which will provide an estimate of the weather for the next month.



The monthly average sea level pressure is expected to be high pressure from the continent to the east, and in the southeast of Japan, the Pacific High Pressure will likely recede to the east. Meanwhile, a low pressure system, a valley of atmospheric pressure from China to south of Japan, is expected near the Bering Sea.
For this reason, it is likely to be affected by low pressure and fronts on the northern and eastern Japan Sea side, while in Okinawa and Amami, it is likely to be affected by fronts and humid air.


Temperatures around 1500m above the air are likely to be covered in warm air in eastern Japan, western Japan, Okinawa and Amami, and are expected to be higher than normal. Meanwhile, near the Sea of Okhotsk, there are times when it is susceptible to cold air above, and is expected to be lower than normal.



On the 2nd, the Japan Meteorological Agency announced early weather information regarding high and low temperatures. In the Kanto region, west, Okinawa and Amami region, the temperature is expected to be high once every 10 years from around the 8th, and there will be some places where the highest temperature during the day will be over 30 C. The unusually lingering heat continues, and the seasons will likely progress slowly. When you are active outdoors, you still need to be careful of heat stroke. Also, the temperature difference between the mornings and evenings is likely to be large, so it is a good idea to choose clothes that are easy to regulate your body temperature and gradually change your clothes.

/BOn the other hand, in Hokkaido, it is expected that temperatures will reach levels once every 10 years from around the 9th, and will suddenly become more susceptible to cold air.
In Hokkaido, the expected maximum temperature is expected to continue to be above 25 C in Sapporo until around the 5th, but temperatures will drop sharply from next week onwards, and it is likely that more and more places will have a daytime high temperature below 15 C after the 9th. Please be careful of poor health due to sudden changes in temperature. Due to the effects of cold air, snow may occur on high-altitude mountains. The autumn leaves area is likely to expand little by little.



Weather will change over a short period of time for the next month, with sunny, cloudy and rainy days going to be replaced in a short period of time. Around Hokuriku, Okinawa and Amami tend to be susceptible to low pressure and fronts, and it is likely to have more rainfall than normal. The Sea of Japan side of Northern Japan tends to be cloudy and rainy, so make effective use of the precious sunlight on sunny days.

Typhoon No. 21 "Mattoo" has developed into a strong typhoon A course similar to Typhoon No. 18 [Latest typhoon information]

2025/10/02 12:22

Today, Thursday, October 2, 2025, at 9am
Typhoon No. 21 "Mattoo" broke out in the east of the Philippines.



Matmo is a name proposed by the United States
Matmo means heavy rain.
There are 140 typhoons, the 55th name.



/Typhoon No. 21 is expected to follow the same course as Typhoon No. 18, which caused great damage, including the collapse of a lake in Taiwan, and is expected to progress westward as it develops.




[Information on Typhoon No. 21 (Mattomo)]
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Typhoon No. 18, which caused major damage in Taiwan and other countries last time, had its central pressure drop to 905hPa in the north of the Philippines, and at one point it became a "large and fierce" typhoon, but this time Typhoon No. 21 is expected to not become a fierce typhoon.

However, due to the influence of the humid air around the typhoon, the atmosphere conditions in Taiwan and the Sakishima Islands in Okinawa will become unstable on weekends, and there are likely some places where rain or thunderstorms will occur.


The course and development of typhoons may change in the future.
Please note that the impact on Japan will also vary depending on the course, so
Please be aware of the latest information in the future.

Weather today, Thursday the 2nd: Beware of rain showers in Hokkaido; the sun will reach Tohoku to Kyushu

2025/10/02 06:33

Today, the 2nd (Thursday), the area around Japan will be covered by high pressure, and the weather will recover in northern and eastern Japan. The temperature is rising from the previous day, and it looks like it will be dry and cool during the day.



Although Hokkaido is sunny, clouds are likely to spread, and there is a possibility of showers or thunderstorms. Even if the sun is reaching you when you go out, you can rest assured that you will have a folding umbrella or other rain gear.


In Tohoku and Hokuriku, rain clouds will develop locally until morning, causing thunderstorms. The weather is likely to improve during the day.

The sun will reach the Kanto and Kyushu. It was dry and hot all over the country during the day, and the temperature is likely to rise from the previous day. This is the forecast for Nagoya's highest temperature, which is 30 C, and is a midsummer day. As the temperature gets cold in the mornings and evenings, the temperature difference between the day and daytime is large. Please be careful when choosing your outfit.
In western Japan, the sky is likely to spread clouds in the afternoon, but the weather doesn't seem to be a major disruption. The weather will be disrupted from tomorrow, the 3rd, so it would be a good idea to make effective use of the daytime sunlight.

Atmospheric conditions are unstable from north to eastern Japan; Northern Japan is being wary of landslides and other disasters until tonight

2025/10/01 17:47

For this time of year, strong cold air is flowing into the sky above Japan. In addition, humid air flows along the high pressure area far east of Japan into the Pacific Ocean side of northern Japan to eastern Japan, causing heavy rain.
On the other hand, there is a low pressure system to the east of the Izu Islands, and the humid air towards the east flows into the Kanto region, and rain clouds are also developing locally in the Kanto region.


Due to the effects of the cold and humid air above tonight, the atmosphere conditions in northern and eastern Japan could be very unstable, leading to heavy rain and thunderstorms.
In northern Japan, heavy rains have increased the risk of landslides. Until tonight, beware of landslides, low-flooded land, flooding of rivers and flooding, and beware in eastern Japan. Also, be careful of severe gusts of winds such as lightning strikes and tornadoes in eastern and northern Japan up until tomorrow, the 2nd (Thursday).



#Expected amount of rain (in places where it is large)
24-hour precipitation expected by evening tomorrow, the 2nd (Thursday)
Hokkaido region 120mm
Tohoku region 80mm
Kanto-Koshin region 50mm
Hokuriku region 60mm

Typhoon No. 21: Typhoon eggs east of the Philippines; beware of typhoons in October [Tropical cyclone information]

2025/10/01 11:24

As of 9am today, Wednesday, the 1st, the Japan Meteorological Agency has announced that it is expected to develop into a typhoon within 24 hours regarding the tropical cyclone developing in the east of the Philippines.
As expected, if it develops into a typhoon, it will be called "Typhoon No. 21."



#Tropical Cyclone Wednesday, October 1st 9am
Area of existence East
Center location of the Philippines 14 25 minutes N latitude 131 50 minutes Western NW 20 km/h
Central pressure 1006 hPa
Maximum wind speed 15 m/s (near the center)
Maximum instantaneous wind speed 23 m/s

In the future, the tropical cyclone east of the Philippines will move westward, and is expected to develop into a typhoon in the east of the Philippines within 24 hours.
From the next day, the 3rd (Friday) to the 4th (Saturday) we will pass through Luzon, the Philippines and reach the South China Sea.
They will proceed westward along the South China Sea on Saturday the 4th to Sunday the 5th, with a storm zone, and on Monday the 6th, with a storm zone, reaching the Gulf of Tonkin.


We do not expect a direct impact on Japan, but if you are planning to travel to the Philippines, South China, or Vietnam, please be careful of the latest information.



As expected, if Typhoon No. 21 occurs, it will be the first typhoon to begin in October this month.
The number of typhoons in last month and September was six, exceeding the average 5.0.
There was 3.4 typhoons in October, which is still a period when typhoons are likely to occur.
Even when October begins, don't let your guard down and be careful of the latest information on typhoons.

Even after the end of the "Great Kuroshio Means", sea surface temperatures in the seas surrounding Japan continue to be high [Marine Summary September 21st to 27th, 2025]

2025/10/01 10:55

The Japan Meteorological Agency and others have announced that the Kuroshio giant meanders, which lasted for seven years and nine months, ended in April 2025, but the aftermath of the Kuroshio giant meanders is still continuing.

There is a meandering near Boso, and at the same time, the vortex that had been torn off the Kuroshio Current is absorbed, and there is a meandering off the coast of Tokai. (From JAMSTEC's Kuroshio Watch)




In addition, in late September, three typhoons occurred on the same day on the seas south of Japan, but in the area of
Japan, the typhoons were covered in high pressure to the sky, so the typhoons were unable to get close, and the sea surface temperatures in the seas around Japan continue to be high.

Below is a summary of the oceans (September 21-27, 2025).



#Pressure arrangement and waves
On the 21st, a cyclone passed around Hokkaido, and a front extending from the
Change pressure system headed south through Honshu.
In the waters around Hokkaido, which is close to the low pressure system, the waves were over 3m tall, and in the waters near the Kurishima Island, the waves were over 4m tall at night, making them go down.

From the 22nd to 23rd, the area around Honshu was covered with high pressure, and the waves in the Japanese Sea passed calmly.


Meanwhile, Typhoon No. 18, which became a fierce force, moved westward north of Luzon, the Philippines.
High waves arrived in the Nansei Islands, accompanied by swells of typhoon origin.

Also, swells from Typhoon No. 19, which has slowed down in the east of Japan, reached a heightened wave on the Pacific side of north to western Japan, causing some areas to surge.



#Sea surface temperature
The sea surface temperature in the Japanese Sea continues to be higher than normal.
In the East China Sea, it was much higher than normal, with a maximum of 4 C higher.


The Nansei Islands continue to have higher than normal waters.
The Pacific side was higher than normal at first, but as the typhoon moves north, the waters below normal have expanded over Japan's East Sea.


The off Sanriku region continues to be 2-3 degrees higher than normal.


It was lower than normal offshore off the southeastern Hokkaido, with a maximum temperature of 3 C lower.
The Sea of Okhotsk continued to be in normal waters, and
The coastal areas were higher than normal.

Atmospheric instability; beware of lightning strikes, gusts of wind, and sudden heavy rain.

2025/10/01 08:19

There is a high pressure system in the waters near the Kuril Islands, and it moves to the northeast. Near the Izu Islands there is a slow, northeasterly low pressure system. The East China Sea has a front extending from east to west, and a low pressure system moves eastward along the front.
Tomorrow, the second day, strong cold air will flow into Japan's skies for this time of year. The effects of cold air above, warm, humid air flowing towards the front and low pressure lines, are expected to make the atmosphere extremely unstable.



Beware of severe gusts of winds such as lightning and tornadoes and sudden heavy rain on the 1st in the Nansei Islands and Western Japan, and on the 2nd in the eastern and northern Japan.
If there are signs of developing cumulonimbus clouds approaching, please ensure safety by moving inside the building. There is a risk of hail falling, so be careful about managing agricultural crops and agricultural facilities.

October starts at the "South Coast Low"; rain is shining north of Kanto; heavy rain in western Japan on the 3rd to 4th [Weekly Weather]

2025/09/30 12:05

Today, the last day of September, the 30th (Tuesday), is covered by high pressure, and autumn sunny days are spreading nationwide.

Open will start tomorrow, but
It will rain mainly in eastern and northern Japan, and
There will be some places where the temperatures will not rise and it will be a bit chilly.



On the night of tomorrow, Wednesday, October 1st, a
low pressure will occur on the front stagnant south of the sea, and is expected to move eastward in the south of Kanto.

This low-pressure course is called the "South Coast Low" and is a low-pressure course that snows on the Pacific side in winter when the temperature is low.

Tomorrow will not allow strong cold air to bring snow, but as it draws in cold air from the northeast towards the low pressure system, temperatures will not rise in areas north of Kanto.






Tomorrow, October 1st, there will be some places in the Kanto region and thunderstorms.
In Sendai, there are likely to be heavy rain and thunderstorms in the afternoon.



In addition to rain gear and towels, it will also be cool during the day, so it would be a good idea to prepare something to wear.



Let's take a look at weather trends in the upcoming weekly weather map.

Thurs, October 2nd
Although autumn clears during the day, the front extends from the continent at night,
There will be some areas in western Japan where rain will begin to fall.


Due to the humid air heading towards the front and low pressures
Rain will fall mainly in western Japan, causing heavy rain.

Sunday 5th - Monday 6th
The front will be obscure in the south of Japan, but
An cyclone is expected to move from the Sea of Japan to northern Japan.
The weather will continue to be unclear throughout the country, and
On Monday the 6th, there will be many rainy areas, mainly in the northern Japan and the Sea of Japan side.




Finally, the weekly forecast.

Want to focus on temperatures, in western Japan and Tokai, the highest temperatures are expected to rise to nearly 30 C and continue to continue next week.

However, there are many days when temperatures fall below 20 C in the mornings and evenings.
Please be careful of daily temperature differences and temperature differences between mornings and evenings.

In Hokkaido, there will be days when it will not reach 20 C even during the day, so
It seems that there will finally be many days when autumn clothes will be useful.