Warning-level heavy rain will occur in western Japan on Saturday the 24th and eastern Japan on Sunday the 25th, which will affect your feet when going out [Heavy rain information]

2025/05/23 14:39

Tomorrow, the 24th (Saturday), a low pressure system with a front will develop and pass through western Japan, and is expected to proceed from eastern Japan to northern Japan on Sunday, 25th (Sunday).



As warm, humid air flows towards the cyclone and front,
The atmosphere condition becomes extremely unstable, and in Kyushu, from the early hours of the morning to the evening of tomorrow (Saturday),
In the Shikoku and Chugoku regions, from around noon to the day, and in the Kinki region,
/Very heavy or heavy rain with lightning will fall from tomorrow night, leading to warning-level heavy rain.

On Sunday the 25th, there will be heavy rain and thunderstorms in eastern Japan, and there will be some areas where heavy rain will be at the level of the
warning.



If you look at the forecast for rain tomorrow (Saturday) from noon to 3pm, Kyushu areas such as
Kumamoto are displayed in purple, and
Money and more than 50mm of rain is expected in three hours.


We are also expected to see active rain clouds in Shikoku and the Chugoku region, and we must be careful of heavy rain as well as lightning and gusts of wind.



In addition, as tomorrow night, active rain clouds will move east, causing heavy rain and thunderstorms in the Kinki and Tokai regions.

It will start raining in the Kanto region tomorrow night, and the rain and wind will increase, especially in the coastal areas, and the rain and wind may occur on the sides of the morning of Sunday the 25th.




As of 11:00 a.m. today (Friday), heavy warning-level rain is expected to be in western Japan on Saturday the 24th, and
An area on Sunday the 25th, will be a wide area in western Japan.

Please be wary of landslides, flooding of low land, flooding of rivers and flooding, and
Please be careful of severe gusts of winds such as lightning strikes and tornadoes.



/B: Also, heavy rain may affect/transportation on Kyushu's East China Sea side, and the Pacific Ocean side of the West to the East Japan coast

/Bullet trains and railways, so please be careful of the latest traffic information when you go out.



Finally, here is the weekly weather ahead.

It will rain widely on this weekend, but
/Best once the week begins, many sunny days will return, and in western Japan, summer days above 25c will return.

However, next week, due to the effects of the cold air stagnating in northern Japan
/changeable weather is expected to continue, especially in northern Japan and Hokuriku.

Even if there is no umbrella mark, you will need to be careful of sudden heavy rain and lightning strikes next week.

Also, in the Okinawa region, which began rainy season on Friday the 23rd, there are many days when the rainy season front is stagnant, and the weather is expected to continue to be prone to rain.

Warning against heavy rain on Saturday the 24th and Sunday the 25th

2025/05/23 08:07

The Sea of Japan has a high pressure system with a center, covering the area around Honshu.
On the other hand, Hanachu has a low pressure system with a front line, and is moving eastward.

Today, there are many areas covered by high pressure, and clouds spread out in the morning, but
There are probably many areas that are sunny over a wide area during the day.
At night, a low pressure system with a front is expected to advance into the East China Sea.
For this reason, it is likely that there will be some areas in Kyushu and Okinawa.



Also, the low pressure system accompanied by this front is expected to move northward around Honshu from tomorrow until the day after tomorrow. Warm and humid air flows towards the front and low pressures
, rain will likely fall over a wide area from the Tohoku region to Kyushu region.


Depending on future developments in the low pressure system and the activities of the frontline, there is a risk that heavy rain will occur at an alarm level. The total rainfall in the Shikoku and Kyushu regions is expected to exceed 100mm
on the 24th. Heavy localized rain is expected to fall on the Pacific side of eastern Japan on the 25th. Please be careful of landslides, flooding in lowlands, and flooding of rivers.

[Summary of the Ocean] The Kuroshio giant meander, which has been going on for 7 years and 9 months, has now disappeared, and signs of an end (May 11th to 17th, 2025)

2025/05/22 13:26

The Kuroshio giant meander, which has been going on for seven years and nine months, has now disappeared, and signs of an end
, below is a summary of the oceans (May 11th to 17th, 2025).



#Pressure configuration and waves
On the 11th and 12th, a front extended from the low pressure system northeasterly through the coast of Kuril Island into Japan's east to the South China Sea.
A low pressure system moves northeasterly along the Sakishima Islands on the front.
The slope of pressure increased around the lying pressure and the front, and strong winds blew mainly in the north to eastern Japan and the Nansei Islands.
On the 11th, waves rose in the Sea of Okhotsk, east of Japan, and central Japan, leading to a storm off the coast of Akita and Noto.
The waves gradually increased in the waters near the Nansei Islands.
On the 12th, high waves continued to occur in the Sea of Okhotsk and the Kuril Islands.
From the 13th to the 16th, the area around Japan was covered by high pressure, and the waves in the waters near Japan continued to move calmly.
On the 17th, the front headed southward around Honshu, gradually rising in the east of Japan.



#Sea surface temperature
The sea surface temperature in the Japanese Sea is slightly higher than normal on the northern and central continental side, and in other areas it continues to be in the same or slightly lower than normal.
The East China Sea has been shrinking slightly lower than normal waters.
The huge Kuroshio meandering, which has been going on for seven years and nine months, has now stopped showing, and it is signs of an end.
The sea surface temperature on the Pacific side gradually rose slightly higher than normal.
The off Sanriku area was lower than normal, with a maximum temperature of 4 C lower.
On the other hand, the temperature was higher than normal offshore off the coast of Hokkaido and around the Sea of Okhotsk, and around 4 C on the coast of the Sea of Okhotsk.

Is this year something strange Typhoon No. 1, the rainy season begins from the north, is being wary of "severe heat and heavy rain" again this summer [3 months forecast]

2025/05/22 13:14

Today, Thursday, May 22nd, the Japan Meteorological Agency announced that the rainy season is expected to begin in the Okinawa region.

The rainy season in Okinawa is 12 days later than usual, and
The rainy season has begun quite late.

This year (2025), the rainy season began in the Southern Kyushu region, and around May 16th.



After that, the rainy season began in the Amami and Okinawa
/The opposite of previous years, the rainy season began in the north.

Normally, the rainy season front is boosted by the strengthening of the Pacific high pressure system, and the rainy season begins from the south, but
This year, the Pacific high pressure system strengthened from mid-May, earlier than usual, and
The rainy season began from the north as the rainy season front moved north to around Kyushu.




This year, there have been unusual events as the rainy season begins, but
Another strange events have been seen in the occurrence of a "typhoon" that is different from usual.

This year, Typhoon No. 1 has not yet occurred (as of noon on Thursday, May 22nd)
It is currently ranked 8th in order of the latest occurrence of Typhoon No. 1.



If you look at the sea in the south where typhoons occur on the forecast weather map for Asia, you will see that
There is no prediction of a typhoon egg (tropical cyclone) or cyclone, and
It is relatively calm.

When I look at the clouds on the sunflower weather satellite, I can't see any large clouds that could become a typhoon.

For this reason, it seems unlikely that Typhoon No. 1 will occur in the next few days, and it may exceed the record for May 25th last year (2024), which was ranked 7th.


In the year of late Typhoon No. 1, there is a tendency for many typhoons to occur from summer to autumn.


After two cases last year, there were many cases of typhoons, with six in August and eight in September, and as a result, the number of typhoons occurred over the average year.

/You need to be careful about typhoons and trends that are likely to change again this year.




According to the forecast for the weather for the June-August summer (three-month forecast) released by the Japan Meteorological Agency the other day,
Temperature is on the rise nationwide, and
There is a high possibility that the weather will be "extremely hot" again this summer.

Also, precipitation is expected to be as high as normal in western and eastern Japan, and
It is likely that the summer will be rainier than usual.


The pressure arrangements that have caused heavy rains at disaster levels many times in the past are the patterns of "heavy rain at the end of the rainy season (active front activity)" and "rainy season front + typhoon."


This summer, it would be a good idea to be careful of heavy rain information and to prepare for heavy rain disasters
/Review the hazard map and recheck disaster prevention products
/Back to check the information.

Okinawa's rainy season is finally underway, the rainy season is stagnant, early in the rainy season, fears of heavy rain at the warning level

2025/05/22 11:58

Today, the 22nd (Thursday), the Japan Meteorological Agency announced that the Okinawa region would "become an onset of the rainy season."
In the Okinawa region, the rainy season is 12th and a day later than usual, and one day later than last year.




It was announced that the rainy season would begin in southern Kyushu on the 16th of this month, and the Amami region on the 19th (Monday).
This is the first time in six years since 2019 that the rainy season has begun after the Amami region, and the first time since 49 years since 1976 that the rainy season has started after the Southern Kyushu.



The Okinawa region is cloudy and rainy weather due to the humid air flowing into the rainy season front and the rainy season front.
We are expected to see more cloudy and rainy days over the next week due to the rainy season front and humid air.
For this reason, it is expected that the rainy season has begun today, May 22nd (Thursday).

#As of the beginning of the rainy season, there is also a fear of heavy rain at the warning level
The front passes south of Japan from the East China Sea and extends east to Japan.
The front is expected to stagnate near the Nansei Islands by tomorrow, the 23rd (Friday).





In the Okinawa main island and Daitojima regions, the atmosphere condition will be extremely unstable due to the effects of humid air flowing into the fronts and fronts.
In particular, today, the 22nd (Thursday), there is a risk of heavy rain of 40mm per hour.
We expect the 24-hour precipitation until noon tomorrow, the 23rd, to be 60mm at a high point.
Depending on the degree of rain cloud development, heavy rain may occur at an alarm level.
Please be careful of landslides, flooding of low land, and flooding of rivers.
Also, in the Okinawa Main Island and Daito Island regions, be careful of severe gusts of winds such as lightning strikes and tornadoes tomorrow, the 23rd.

The rainy season is a seasonal phenomenon, and on average there is a period of "changes" of about five days after its inception.
Weather information regarding the rainy season is released as a breaking news based on the weather conditions up to now and the outlook for up to one week ahead.
Last day, the rainy season begins and ends will be comprehensively reviewed and confirmed.

Weather today, the 22nd: Weather in western Japan is raining mainly in the morning, and be careful of sudden thunderstorms north of Kanto, be careful of heavy rain in Okinawa

2025/05/22 07:20

Due to the rainy season front on the southern coast of Honshu and the low pressure system on the front, active rain clouds are being exposed, mainly on the Pacific side of western and eastern Japan, and some areas are falling rain. Another front is also stagnant near the Tohoku region.



On today, the 22nd, rain will mainly occur in the mornings, and in some cases it will gradually become sunny in the afternoon.
In the Hokuriku, Kanto and Hokkaido, the sky will be cloudy and unclear in the afternoon, with sudden rain and thunderstorms from the evening to the night. Be careful of gusts of wind, such as lightning strikes and tornadoes.


In the Kanto region, the temperatures are high, mainly on the Pacific side, and the humidity is high due to the influence of humid air, so it will become humid and humid. To avoid heat stroke, try to drink plenty of hydration and salt.
On the other hand, the temperatures in the Sea of Japan side are often lower than yesterday, and in Niigata and Tottori, the temperature will be over 12 C.



In the Nansei Islands, very active rain clouds corresponding to the front can also be seen on the rain cloud radar at 7am today. These rain clouds gradually move south, and there are likely areas where heavy rainfall with thunder will occur on Okinawa main island. By 6am tomorrow, heavy rain is expected to reach 24 hours a day, with heavy rainfall of 100mm. Be careful of gusts of winds such as landslides, flooding of low land, rising rivers, and lightning strikes and tornadoes.
In Okinawa, the rainy season is expected to begin soon, so the announcement of the rainy season is coming soon.

Three-month forecast: The heat will be severe nationwide again this year, and be careful of heavy rain due to the revitalization of the rainy season front

2025/05/21 23:29

Yesterday, the 20th (Tuesday), the Japan Meteorological Agency announced a three-month forecast, which will be the weather forecast from June to August.



Due to the effects of global warming, the overall temperature of the atmosphere has been increased across the globe.
The westerly winds above will be more likely to flow north than normal, and the Tibetan high pressure system is expected to become stronger on the north side than normal.
Also, the Pacific High Pressure is expected to have a stronger protrusion westward protrusion on the south side of Japan compared to normal, and warm, humid air is likely to flow around Honshu.
Due to these effects, it is likely that the area around Japan will be covered in warm air, and there is a time when the rainy season front will be active, mainly around Honshu.



On sunny days, the temperature will rise, and many days will be midsummer days above 30 C or extremely hot 35 C. Today, the 21st, the temperature was 35.0 C in Kamioka, Hida City, Gifu Prefecture, making it the first hot day of the year, but it is likely that the harsh heat will continue nationwide from June to August. The higher the humidity, the more likely it is to increase the risk of heat stroke. Please consciously hydrate, take breaks, and use air conditioning indoors.



Also, due to the strong overhang of the Pacific High Pressure to the west, the humid air around the high pressure will activate the activity of the rainy season front, and it is expected that precipitation for the next three months from western to eastern Japan will be on par with normal to higher than normal.
The rainy season has already been announced in the southern Kyushu and Amami regions, and it is possible that the rainy season will soon be announced in Okinawa. The other rainy season will likely be announced in Honshu after June.
It is best to take as early as possible to prevent heavy rain, such as cleaning the gutters to improve drainage.

Warning-level heavy rain on the Pacific side up tomorrow; rains widely on weekends; change from midsummer day; low temperatures continue after weekend

2025/05/21 13:58

Weekly Weather Forecast
#Low pressure on the rainy season front; heavy warning-level rain on the Pacific side tomorrow
#Weather will be disrupted widely this weekend as well Heavy rain on the Pacific side in western Japan
#Severe high temperatures on the Pacific side tomorrow starting from around the weekend to fall below normal



#Low pressure on the rainy season front; heavy warning-level rain on the Pacific side tomorrow

On the 21st, the rainy season front extends into southern Kyushu, and as of 11am, heavy rain warnings have been issued in southern Kyushu.
After this, the rainy season front will head north through Kyushu, and a low pressure system is expected to occur on the front.
From tomorrow, the 22nd (Thursday), this low pressure system will move from the southern coast of Honshu to the east of Japan.
Warm and humid air flows towards the low pressure and fronts, and there is a risk of heavy warning-level rain on the Pacific side of the west and eastern Japan.
Another front will also extend into Tohoku, and heavy rain will also be on the rise with localized lightning.

The rainy season front is expected to move south for the day, the 23rd (Friday) and leave Honshu.
The front will stagnate in the Nansei Islands, and the rainy season may begin much later than usual in Okinawa.
There will be places where the sunlight will return to the area around Honshu.

#The weather is getting worse this weekend too. Heavy rain on the Pacific side of western Japan
However, on Saturday the 24th, the front again moved north.
The front extends from the East China Sea to the southern coast of Honshu, and a low pressure system is expected to occur on the front.
From Monday the 26th, this front-line low pressure system will move eastward along the southern coast of Honshu.
The effects of low pressure and warm, humid air towards the front line will increase front line activity, and heavy rain is likely to occur, especially on the Pacific side of the western Japan, from the weekend, Saturday the 24th to Sunday the 25th.
Please be careful of the latest weather information.

From Tuesday, the 27th to Wednesday, the 28th, high pressure will move from the Sea of Japan to the east of Japan.
The front is expected to go south and leave Honshu.
However, clouds are likely to spread throughout the country, and the sky is likely to be unclear.

#Severe high temperatures up to tomorrow, and it has changed to lower than normal.
As of 11am today, Wednesday the 21st, there are already midsummer days from Sanin to Tohoku.
Tomorrow, the weather will be disrupted widely on Thursday the 22nd, and the temperature will drop and the temperature will decrease on midsummer days, but in many places the temperature will be significantly higher than normal.
From around the weekend, the weather has been cloudy and rainy, with many places having temperatures lower than normal, and the temperatures are particularly low on Sunday the 25th, and it is likely that in the city center there are some places that do not reach 18 C or 20 C.
Please be careful not to get sick due to daily temperature differences.

Southern Kyushu - Risk of warning-level heavy rain; Beware of landslides and lowland flooding

2025/05/21 07:16

The rainy season front, which stretches from Hanachu to the south coast of Kyushu, will head north to the vicinity of Kyushu today, the 21st, and a low pressure system is expected to occur on the front. Tomorrow, the 22nd, a low pressure and rainy season front will pass through southern Kyushu and head south to the Amami region.
Wild Warm and humid air flows towards this rainy season front and low pressure, making the atmosphere extremely unstable.

For this reason, cumulonimbus clouds develop locally in southern Kyushu until the day before noon, the 22nd, and in the Amami region, until the night, the 22nd, there is a risk of severe gusts of winds such as lightning strikes and tornadoes.



[Rain Prediction]
In southern Kyushu, extremely heavy rain and heavy rain with localized lightning will fall late today, the 21st, and there is a risk of heavy rain. If the rain clouds develop more than expected, or if extremely heavy or heavy rain continues in the same location, there is a risk of heavy rain at the warning level.

#Expected amount of rain (at high places)
+1 hour precipitation expected today, the 21st
Miyazaki Prefecture: 50mm
Kagoshima Prefecture (excluding Amami region) 50mm

1 hour precipitation expected tomorrow, the 22nd
Miyazaki Prefecture: 10mm
Kagoshima Prefecture (excluding Amami region) 20mm

24 hour precipitation expected until the 22nd
Miyazaki Prefecture: 150mm
Kagoshima Prefecture (excluding Amami region) 150mm

Kagoshima Prefecture (excluding Amami region) 150mm

Beware of landslides, low-ground flooding, rising rivers, and severe gusts of winds such as lightning and tornadoes.
If there are signs of developing cumulonimbus clouds approaching, try to ensure your safety by moving inside a sturdy building.

Weather today, Wednesday the 21st: The rainy season front moves north; the weather is downhill from the west; watch out for heavy rain in Kyushu

2025/05/21 06:24

Today, the 21st (Wednesday), the rainy season front will move north to southern Kyushu, and the range of rain will gradually expand from the west. Another front will likely extend towards the Tohoku region.



In Hokkaido, the sunlight reaches mainly in the morning, but the sky is likely to gradually spread out as clouds tend to spread. On the Sea of Japan side, there are some areas where showers will occur after the evening, so it's safe to have a folding umbrella.
In Tohoku, the weather will likely be rainy, especially in the northern part of the country. Please bring rain gear when you go out.


The sun will reach the beginning of Eastern Japan, but clouds will gradually widen. Please be careful of changes in the sky as there are areas with showers, mainly along the mountains. In addition, the later in the night in Tokai and Hokuriku, the more likely it is to rain. If you're late to get home, it's a good idea to have a folding umbrella or something similar.
Also, the temperature rises mainly inland, so be careful of heat stroke.


The weather in western Japan seems to be heading downhill. Rain will fall in Kyushu with lightning in the morning, with extremely heavy rain over 50mm per hour. Be careful of landslides, flooding of low land, and flooding of rivers.
It will rain in Chugoku and Shikoku in the afternoon, and it will rain in Kinki in the evening. Please bring rain gear when you go out even if it's not raining.