Heavy rain and storm warnings are now being announced on the Pacific side of the Tohoku region!

2025/05/31 17:08

A low pressure system with a front is located near the Izu Islands, and is developing and moving northeast.
The blocking front and warm front extending from the center reach from Tokai in the Kanto region off the coast of Sanriku and Japan's Tokai.





Currently, developed rain clouds are spreading in the southern part of the Tohoku region, and a heavy rain warning has been issued in Miyagi Prefecture.
In addition, storm warnings have been issued for coastal areas of Iwate, Miyagi, and Fukushima prefectures.





The cyclone is expected to travel off the coast of Sanriku tomorrow, June 1st.
For this reason, a very strong wind will blow from the north on the Tohoku Pacific side, making it a huge hit at sea.
Also, it is expected that very heavy rain will fall with lightning, and there will be some areas where heavy rain will occur.

/Beware of storms and high waves as early as the dawn of June 1st.
Also be careful of landslides and flooding of low land.




[Wind forecast]
Maximum wind speed expected from the 31st to June 1st (maximum instantaneous wind speed)
Tohoku Pacific side Seaside 23 meters (35 meters)
Tohoku Pacific side Land 18 meters (30 meters)

[Wave forecast]
[Wave forecast]
[Wave height expected from the 31st to June 1st
6 meters

[Rain forecast]
31 The expected one-hour precipitation is high on a day,
: Tohoku Pacific side: 50mm
: The 24-hour precipitation is high on a day, from 6pm on the 31st to 6pm on the 1st,
: Tohoku Pacific side: 120mm

: [Disaster Prevention]
: On the Tohoku Pacific side, beware of traffic disruptions caused by storms from the dawn of June 1st, and at sea, beware of damage to ships and coastal facilities due to high waves from the beginning of the night of the 31st to the dawn of June 1st.
Also, towards the beginning of the night of the 31st, beware of landslides caused by heavy rain and flooding of low land, and be careful of flooding of rivers.

Tohoku region, rough weather centered on the Pacific side, beware of traffic disruptions caused by storm

2025/05/31 06:52

A low pressure system is located off the coast of the Tokaido road, and is progressing northeast as it develops. This low pressure system is expected to travel off the coast of Sanriku tomorrow, up to the 1st.
For this reason, very strong winds from the north will blow over the sea on the Pacific side of the Tohoku region, making it possible to blow.
Also, heavy rain with thunder is expected to fall on the Pacific side of Tohoku, with some areas expected to cause heavy rain. If the low pressure system develops more than expected, it could result in heavy rain or high waves at the level of warning.


Please be careful of traffic disruptions caused by storms from the afternoon of the 31st to the dawn of the day, and be careful of damage to ships and coastal facilities caused by high waves from the evening of the 31st to the afternoon of the 1st to the afternoon of the 1st.
Also, on the Pacific side of Tohoku, from the afternoon of the 31st to the dawn of the day tomorrow, we need to be careful and be careful of landslides caused by heavy rain, flooding of low lands, and rising rivers.




#Expected wind strength
+Maximum wind speed expected from today 31st to tomorrow's 1st (maximum instantaneous wind speed)
Tohoku Pacific side 20m/s (30m/s)
Tohoku Pacific side 15m/s (30m/s)

#Expected rainfall (at a large location)
+1 hour precipitation expected from today 31st
Tohoku Pacific side 30mm
+24 hour precipitation expected by the dawn br Tohoku Pacific side 120mm

#Expected wave height
+Wave height expected from today 31st to tomorrow's 1st
Tohoku Pacific side 5m

Weather today, Saturday the 31st: Rain and winds are getting stronger in Northern Japan - Eastern Japan - Many places in western Japan are exposed to sunlight

2025/05/31 06:17

Today, the 31st (Saturday), the low pressure system is expected to move south of Kanto and northeast. Be careful of increasing rain and wind in northern Japan to eastern Japan.



Rain will likely fall over a wide area from Northern Japan to Kanto and Hokuriku. The winds will be stronger along the Pacific coast, and there are likely some places where side-punching will fall. In particular, on the Pacific side of Tohoku, there is a risk of warning-level heavy rain and storms, so beware of traffic disruptions caused by storms, and be careful and wary of landslides caused by heavy rain, flooding of low lands, and rising rivers.
The temperature rises slowly due to rain, and there will be some places around the Tohoku, Kanto and Hokuriku that are as cheerful as April. It would be a good idea to have a jacket when going out.


Rain is expected in Tokai and Kinki, mainly in the mornings. Many places stop on the Pacific side in the afternoon, but the Sea of Japan side is likely to be rainy. It's safe to have a folding umbrella when going out.


There are many places in Chugoku, Shikoku, Kyushu, and Okinawa where the sun is reachable, so many places are perfect for going out. The temperature is high and summer days are expected in various places.

Weekend: Tohoku Warning-level heavy rain and high waves, cold vortex attacks, changing weather in Kanto, heavy rain again at the end of the week, and the heat has returned to life [Weekly Weather]

2025/05/30 13:07

Weekly Weather Forecast
#Weekend There are fears of warning-level heavy rain and high waves on the Tohoku Pacific side
#Cold vortexes are coming in Weekend changeable weather
#The end of the week Heavy rain on the west to the Pacific side of the Pacific side due to low pressure and the effects of fronts
#Changes from the low temperature trend The heat is back from mid-next week Also on mid-summer days



On today, the 30th (Friday), the front extends from the continent to east through the Southwestern Islands, and the low pressure south of Japan on the front moves northeast.
Due to the influence of the front and low pressure system, rain fell mainly on the western and eastern Japan Pacific side during commutes and school hours, and in some areas, raining drastically in Shizuoka Prefecture and Kanto, Koshin.
In the afternoon, the solid rain clouds around Kanto, Koshin are expected to gradually pass through Tokai.
The rain will stop at more places, but be careful of showers.

#Weekend: Fear of warning-level heavy rain and high waves on the Tohoku Pacific side




Towards the weekend, the front-line cyclone will move towards the offshore of Sanriku.
The rain clouds are expected to hit western Japan and Tohoku tomorrow, the 31st (Saturday), and to Tohoku and southern Hokkaido tomorrow, the 1st (Sunday).
On the Tohoku Pacific side, which is close to the low pressure system, there will be heavy rain and heavy rain.
There is a very strong wind blowing from the north and there is a possibility that there will be some areas to blow.
If the low pressure system develops more than expected, there is a risk of heavy rain or high waves as high as the warning level.

#Cold vortexes are attacking Weekend changeable weather
Today, the 30th (Friday), a cold vortex with cold air below -18 C is attacking around 5,700m above western Japan.
Although the cold vortex deepens, it will continue to go to eastern Japan tomorrow, the 31st (Sat), and north Japan tomorrow, the 1st (Sun), and slowly pass around Japan over the weekend.
Even in places where rain stops and sunny days are visible on weekends, such as Tokai and Kanto, the air condition will become unstable due to the cold air above and the temperature rise caused by solar radiation. Be careful of changes in the sky pattern.

#New week Heavy rain on the west to the Pacific Ocean side of the Pacific Ocean due to low pressure and the front line
On weekends, the weather will recover for a while, but at the end of the week the weather will go downhill from the west again.
The rainy season front moves north from the west. A low pressure system will occur on the front line and are expected to pass through the area around Honshu.
2nd (Monday) will rain in Okinawa and western Japan, and on Tuesday the 3rd (Tuesday), there will be heavy rain in the west to the Pacific Ocean of Japan.
Please be careful of the latest weather information as it may cause heavy rain to be at the level of warning, depending on the trends in front and low pressure.





#Actually, the temperature trend changes. The heat is back in the middle of next week. Also on mid-summer days
We expect the temperature trend to be low in the area around Honshu around Tuesday the 3rd, but the heat will return from Wednesday the 4th.
There are more places where temperatures are higher than normal, and in the inland areas of Kanto, Koshin, there may be midsummer days. Don't forget to take measures against heat stroke.

Latest month forecast: Precipitation is high on the Pacific side of the western Japan, with the expected long-lasting humid days in the second half of June.

2025/05/30 05:17

On the 29th, the Japan Meteorological Agency announced the latest one-month forecast, which will provide an estimate of the weather for the next month.



According to the prediction results of the numerical forecast, the waistline of the isobar line corresponding to the rainy season front is predicted near the southern coast of Honshu, just like in normal years (the dashed red line in the figure). It is expected that there will be a period when it is susceptible to low pressure and fronts, mainly on the Pacific side of western and eastern Japan.
The average temperature around 1500m above the sky is predicted to be low from the north of China to the Yellow Sea, while being higher than normal, mainly around the Kamchatka Peninsula and northern Japan. For this reason, the area around Japan is likely to be covered in warm air, and temperatures are expected to be higher than normal.


For the next month, the temperature difference will be large, mainly in western Japan, with the temperatures likely to be higher and more humid in the second half of the period.



At the beginning of June, temperatures will likely be lower than normal in western and eastern Japan due to the effects of cold air above.
After that, the temperature trend has been higher than normal nationwide, with more humid and humid days coming into the second half of June.
Could you be careful when managing your health and choosing your clothes as the temperature difference is likely to be large. Also, during the second half of the period, you need to be careful of heat stroke. It is best to take measures against the heat not only on sunny days, but also on cloudy or rainy days when the temperature is high. The second half of the

period will be cloudy and rainy days, as in normal years, and the rainy season will begin in various places around Honshu. Precipitation is higher than normal, mainly in the northern and western Japan Pacific sides, and in some locations it is likely that heavy rain may occur even before the rainy season begins. Be prepared for early heavy rain before the full-scale rainy season begins.

The estimated temperature for tomorrow, the 30th (Friday): Hokkaido is as hot as midsummer, and Kanto is on a chilly day, just like March.

2025/05/29 20:14

On tomorrow, the 30th (Thursday), a low pressure system accompanied by a front will approach the Pacific side of eastern Japan, and the rain and wind will be strengthened, mainly in the morning in the Kanto and the Izu Islands. As the rain peak may overlap during commuting and school hours, it is likely that you will need to be careful about the impact on traffic.



The difference in temperature will be large between Hokkaido and Honshu tomorrow.


In Hokkaido, there are many places where it is sunny due to high pressure, and during the day, temperatures are likely to range from early July to midsummer or higher. The summer day forecast is 29 C in Sapporo, and the summer day will be 30 C in Asahikawa. Make sure to drink plenty of hydration to avoid heat stroke.


On the Tohoku Pacific side and Kanto, rain will not raise temperatures and will be chilly. In particular, in the Kanto region, temperatures will drop more than the previous day, the 29th due to winds that are closer to the north. The estimated highest temperature in Sendai is 18c, similar to late April, while the estimated highest temperature in Tokyo is 16c, equal to late March.
Tomorrow is likely to be a chilly day, mainly in the Kanto region, so it would be a good idea to go out wearing a long sleeves and a thick jacket.


In the areas from Hokuriku and Tokai to west, the highest daytime temperatures are expected to remain at around 20 C due to rain. The estimated maximum temperature in Nagoya is 22 C, similar to the late April, while in Osaka it is 21 C, and in Fukuoka it is 20 C, which is likely to be around the middle of April. It would be a good idea to wear a long-sleeved shirt or blouse, such as a cardigan.

[An alarm level heavy rain] Peak of rain: tomorrow, Friday the 30th, some overlap with morning commuting and school hours.

2025/05/29 12:11

Today, the morning of the 29th (Thursday), a cyclone of pressure occurred on the rainy season front, which is stagnant in the Nansei Islands.




/B: On the main island of Okinawa, which is close to the center of the low pressure system, there are areas where extremely heavy rain, like waterfalls, is expected to fall in the afternoon of today, Thursday the 29th, and we need to be careful of the river rising in the afternoon.

The low pressure system on the front is expected to develop tomorrow, the 30th (Friday)

/The low pressure system on the front is expected to move north to the Kanto region, including the area around eastern Japan.


The active rain clouds that plagued the area around Okinawa will also move north, and the morning of the 30th (Friday) may cause heavy rain or thunderstorms in the Kanto region and elsewhere.


There is a risk that the peak of rain will overlap with the morning commute to work or school.
/BPlease take full precautions to prevent rain tomorrow morning.



If you look at the forecast for rain tomorrow morning (amount of rainfall estimated at 7am to 10am), you will see the forecast of active rain clouds (red and purple) spreading to the north of the front from the Tokai region to the Izu Islands and southern Kanto region.

In particular, the atmosphere conditions will become unstable in low pressure and around fronts, and
There is a risk of extremely heavy rain or heavy rain accompanied by lightning.


The wind is expected to be strong along the coast, and there is a possibility that rain will be hit by side.

There are areas where heavy rain falls in the Kanto region in the afternoon, but in the evening, the active rain clouds will pass eastward, with many areas where the rain will cease.

[Expected rainfall]




/B: Kanto region and Izu Islands (24 hours a day, with a high rainfall)

/B: Until 6am tomorrow, Friday the 30th, 6am, AM
/B: Northern Kanto region 20mm
/B: Southern Kanto region 40mm
/B: Izu Islands 120mm
/B: 6am tomorrow, Friday the 30th, until 6am tomorrow, Saturday the 31st, 100mm
: Southern Kanto region 120mm
Izu Islands: 150mm

In the Kanto and Izu Islands, beware and beware of landslides, low land flooding, and river flooding

However, a cold vortex is moving south over Japan, and the low pressure system and front movements from tomorrow afternoon have not yet been determined.

If the rain clouds stagnate more than expected, the amount of rain may increase than expected, and the timing of rain may still change.
Please continue to be careful of the latest information about rain.




Due to the effects of a low pressure (cold vortex) with cold air above the sky through Saturday, the

Head rains may occur on the Sea of Japan side, including Sanin.


When cold air flows into the sky, the weather often changes suddenly, and even if the sunny weather has returned, you need to be careful of sudden rain and lightning strikes.



As a sign that the rainy season is approaching,
/ The front is expected to reach Honshu again at the beginning of the week.

From Monday, June 2nd to Tuesday, June 3rd, low pressure systems occurring on the
Front and front will travel through the west and eastern Japan.

Please note that there is a risk of heavy rain on the Pacific side of western Japan and eastern Japan in the first half of next week.


Since heavy rain will occur even in areas where the rainy season has not yet begun,
Please make sure to prepare for the rain, such as cleaning gutters and gutters, checking hazard maps, etc.

Okinawa region: risk of heavy rain at the warning level. Be careful of landslides, etc.

2025/05/29 07:24

The front extends east and west from Japan's East Sea to the south coast of Japan and around Okinawa to the south of China.
Today, a low pressure system will develop on the front line near Okinawa, and is expected to move northeast.
In the Okinawa region, the air condition is expected to become extremely unstable due to the effects of low pressures that occur on the rainy season front and the front line.


In the Okinawa main island region and the Sakishima Islands, depending on the degree of rain cloud development, there is a risk of heavy rain at the level of warning.
Please be careful of landslides, flooding of low land, and flooding of rivers.
Also, be careful of severe gusts of wind, such as lightning strikes and tornadoes.




[Rain forecast]
The expected one hour precipitation on the 29th is high,
The expected 24 hour precipitation from 6:00 on the 29th to 6:00 on the 30th is high,
The expected 24 hour precipitation from 6:00 on the 29th to 6:00 on the 30th is high,
The expected 24 hour precipitation from 150 on the 29th is to 100 mm

[Disaster Prevention]
In the Okinawa Main Island and the Sakishima Islands, there is a risk of heavy rainfall of warning level on the 29th in the Okinawa Main Island and the Sakishima Islands.
Please be careful of landslides, flooding of low land, and flooding of rivers.
In the Okinawa region, on the 29th, be careful of severe gusts of winds such as lightning strikes and tornadoes.
If there are signs of developing cumulonimbus clouds approaching, try to ensure safety by moving inside the building.
Please note that on the 29th, the wind direction will suddenly change from southwest to northeast in the Okinawa main island region, and from southwest to northwest in the Sakishima Islands, with winds expected to increase.

The large Kuroshio meandering is coming to an end as the surface temperature of the sea off Sanriku coast is falling [Marine Summary (May 18th to 24th, 2025)]

2025/05/28 13:15

The longest in statistical history of the Kuroshio Great Snake, the Kuroshio giant meander, has been around for seven years and nine months, is showing signs of an end.
The sea surface temperature off Sanriku has also dropped significantly compared to a few months ago, and
The sea surface temperature is below normal.

Below is a summary of the oceans (May 18th to 24th, 2025).



#Atmospheric configuration and waves
On the 18th, the front line stagnated from the continent through Honshu and off the coast of Sanriku.
Wave heights around 3m from the offshore Sanriku to the east of Kanto.

On the 19th, the front moved south, and the high waves subsided.
On the 20th, a low pressure system passed through the Tohoku region, but there were no areas where the waves were escalated.

On the 21st, the front line extended from the continent to Kyushu and Tohoku.
The wave height has risen to around 2m in the East China Sea.

On the 22nd, a low pressure system occurred on the front near Kyushu, and headed east along the southern coast of Honshu.
On the evening of the 22nd, the waves were about 3m high on the southern coast of Honshu.

On the 23rd, the low pressure system was slow in the south of Kanto, and at night there was a wave height of over 3m in the waters near the Izu Islands.

On the 24th, a low pressure system accompanied by a front passed through western Japan.
At night, the waves are around 3m high, near the Tsushima Strait, off the coast of Kyushu, from the eastern coast of Shikoku.



#Sea surface temperature
The sea surface temperature in the Japanese Sea has been trending at normal or slightly higher in the northern part, but
In the central and western parts, waters slightly lower than normal have expanded.


The East China Sea has also expanded slightly lower than normal waters.
The Kuroshio giant meander, which has been in operation for seven years and nine months, has significantly reduced the meandering, and is a sign of its ending.


The sea surface temperature on the Pacific side continued to be in the same level as normal.
The off Sanriku area was lower than normal, with a maximum temperature of 3 C lower.

/BOn the other hand, the coast of Hokkaido and the Sea of Okhotsk were higher than normal, and the Celsius was around 4 C on the coast of the Sea of Okhotsk.

"Rainy Season Front + Cold Vortex" - Risk of "Anti-level heavy rain" in Kanto and other areas from Friday the 30th [Weekly Weather]

2025/05/28 12:03

Today, the 28th (Wednesday), is covered in high pressure and is sunny nationwide.

Until tonight, the area around Honshu will be covered by high pressure, but
The rainy season front is expected to move north through Okinawa and the Sakishima Islands.



When tomorrow, the 29th (Thursday), a low pressure system will occur on the rainy season front, and
We will head north near Okinawa main island.

In addition, on Friday the 30th, the low pressure system on the rainy season front is expected to move north towards Honshu, developing.

It is the cyclone (cold vortex) with cold air above this rainy season front and low pressure system are lifted northwards.

The warm, humid air heading towards the rainy season front will collide with the cold air above, and the atmosphere is expected to become unstable over the weekend.


Not only in Okinawa and Amami, but also around Honshu, heavy rain with lightning or extremely heavy rain can fall locally, causing heavy rain.



As of 11am today, heavy warning-level rain is expected in the
Okinawa and Amami regions from tonight until around Friday the 30th, and in Kanto regions such as Tokyo and Kanagawa, mainly on Friday the 30th.



If you look at the three-hour precipitation from 9am to noon tomorrow, the 29th (Friday), there are active rain clouds (in the red and purple areas) over the Amami region, Okinawa main island, and the Sakishima Islands.

The expected amount of rain (24 hours a day, with high rain)
Okinawa region
Until 6am tomorrow, Thursday the 29th
Okinawa main island region 100mm
Sakaijima islands 120mm

Tomorrow, Thursday the 29th - Friday the 30th
Okinawa main island region 150mm

Okinawa main island region 120mm

Intl. In the most common areas, it is expected to rain around 250mm in just two days.



After that, active rain clouds will move north and are expected to hit the area around Honshu.


/The forecast for the rainfall in the Kanto region, where heavy rain is expected to be at the level of warning, has not yet been announced, but there will be heavy rain and thunderstorms, mainly on the 30th (Friday), and the possibility of heavy rain warnings being issued in Kanto is increasing.

Please note that depending on the course of the low pressure system, the area of heavy rain may expand even further, so please continue to be careful of the latest information on heavy rain.



Finally, the weekly forecast.

The start of June is due to the effects of cold weather, and rain and thunderstorms will continue in northern Japan, but the weather will recover from west to eastern Japan.

With west of Kanto, there are many summer days above 25 C, and the heat is expected to return.

From Tuesday, the rainy season front is expected to extend to the area around Honshu, and
There will be many places where rain will fall.