Typhoon No. 3 Ogasawara Atmospheric unstable; the weather around Honshu is on the rise, and the dangerous heat of overheating

2025/07/03 13:16

Weekly Weather Forecast
#Widely Air Condition Very Unstable Weather Changes - Warning-class heavy rain
#High Pressure Power Increases, Tropical Nights due to dangerous heat exceeding body temperature
#Typhoon No. 3 has occurred



#Widely Air Condition Very Unstable Weather Changes - Warning-class heavy rain
On Wednesday, yesterday, Hyogo Prefecture, Kyoto Prefecture, Tochigi Prefecture, Fukushima Prefecture, Miyagi Prefecture, and Yamagata Prefectures, and record-breaking heavy rain information was announced.
Tomorrow, the 5th (Saturday), we need to be vigilant against sudden, extremely severe thunderstorms, especially in the afternoon.
The high pressure system will stagnate near western Japan.
From Okinawa to Tohoku, the temperature will rise with clear weather and warm, humid air surrounding the high pressure, and the atmosphere is expected to become extremely unstable, especially in the afternoon.
Even in the sun, the weather will change dramatically, with localized, extremely heavy rain with lightning.
If the rain clouds stagnate, there is a risk of heavy rain at the level of an alarm.
Also, a low pressure system will advance to the Sea of Okhotsk, and cold air will pass over northern Japan tomorrow, Saturday the 5th.
There are some areas in Hokkaido that are raining, and the atmosphere is expected to become unstable due to the warm, humid air facing the low pressure system and the cold air above.
Please be careful as the rain may suddenly become more intense.





#Pacific high pressure increases in power Tropical nights due to the dangerous heat of exceeding body temperature
After that, the Pacific high pressure will gradually increase in power.
From Sunday the 6th to Monday the 7th, the Pacific High Pressure is expected to protrude near western Japan, and from Tuesday the 8th to Thursday the 10th, it is expected to protrude into the Sea of Japan.
At this time, there may be some places where the end of the rainy season will be announced.
There will be some places where the summer sun will shine, and there will be some hot days and tropical nights every day.
There is a high temperature reaching 36 C, mainly in western Japan and Tokai, and there are some areas where the temperature is likely to be dangerous, exceeding the body temperature.



#Typhoon No. 3 has emerged
Today, Thursday the 3rd, at 3am, a tropical cyclone developing in the waters near Ogasawara became Typhoon No. 3 (Moon).
In the Ogasawara Islands, the atmosphere condition is expected to become unstable due to the effects of warm, humid air around the typhoon until tomorrow, the 4th (Friday).
Beware of sudden heavy rain, lightning strikes, and gusts of wind.

Heat stroke warning alert for July 3rd Announcement in 17 regions, mainly in western Japan

2025/07/03 08:52

The Ministry of the Environment has issued a heat stroke warning alert for today, Thursday, July 3rd, to 17 western Japan regions, including Hyogo, Hiroshima, and Fukuoka.


In areas where a heatstroke warning alert has been issued, temperatures are significantly rising, and there is a high risk of heatstroke. As this could lead to health damage, be sure to not only replenish your water and salt content, but also avoid direct sunlight, and use air conditioning such as air conditioners indoors to actively take measures against heat stroke.
In particular, elderly people and infants are prone to heat stroke, so be careful and take measures against heat stroke, such as replenishing water and salt, and using air conditioning.

[Heatstroke warning alert announcement area]
Hyogo Prefecture Hiroshima Prefecture Shimane Prefecture Tottori Prefecture Tottori Prefecture Tokushima Prefecture Kagawa Prefecture Ehime Prefecture Kochi Prefecture Yamaguchi Prefecture Fukuoka Prefecture Oita Prefecture Nagasaki Prefecture Saga Prefecture Kumamoto Prefecture Miyazaki Prefecture Kagoshima Prefecture (excluding Amami Region) Okinawa (Yaeyama Region)

[What is a Heatstroke warning alert]
A Heatstroke warning alert is information announced by the Ministry of the Environment that calls for heatstroke prevention. In the areas announced, significantly higher temperatures could lead to damage to human health due to heat stroke. Don't think of it as someone else's problem, prioritize protecting yourself from the heat.

High temperatures nationwide: Announcement of the end of the rainy season in June in western Japan; Summary of weather and temperatures (June 22 - June 28, 2025)

2025/07/03 06:49

This is a summary of the weather during this period (June 22nd to June 28th).

#Summary of weather for the current period (June 22nd to June 28th)
The average temperature was higher than normal nationwide due to the warm air surrounding Honshu. In particular, the trend was significantly higher than normal in northern and eastern Japan, with temperatures higher than normal in Tokyo, Sendai, Sapporo, Asahikawa and Kushiro, temperatures higher than normal, and temperatures higher than normal in Muroran and Abashiri temperatures higher than 5-6 C, which was significantly higher.


Pressure precipitation was more susceptible to the rainy season front and low pressure, mainly on the Sea of Japan side, and more rainfall than normal, mainly on the Sea of Japan side of the north to western Japan. On the other hand, on the Pacific side of the west and eastern Japan, there were many cloudy and rainy days due to the influence of moist air, but precipitation was lower than normal.

Sunlight hours were lower than normal, mainly in the Tohoku Sea of Japan side, Hokuriku, and Tokai, which were easily affected by the rainy season front and low pressure system. On the other hand, on the Pacific side, there was a lot of sunlight in Hokkaido and Kanto. Western Japan was cloudy and rainy due to the rainy season front, but the period was covered by high pressure during the second half of the period. Many places had more sunlight than usual.



[About the weather during this period]
#Characteristics of atmospheric pressure layout
On the 22nd, the rainy season front spreads north to western Japan, through the East China Sea, and gradually moved south from western Japan to eastern Japan. In the waters near Ogasawara, low-pressure areas have become tropical cyclones. On the 23rd, the rainy season front stagnated from north to western Japan and through the East China Sea through the Hanachu. In the East China Sea, a low pressure system emerged on the front and moved eastward. Typhoon No. 2 broke out in the waters near Ogasawara around 9am. On the 24th, the rainy season front stagnated from Chinachu to east of Japan, and the low pressure system on the front moved northeast. Typhoon No. 2 travels north through the Izu Islands with strong winds. On the 25th, a low pressure system passed through the Sea of Japan, with a warm front passing through northern Tohoku and a cold front passing through western Japan. Typhoon No. 2 has been transformed into a tropical cyclone near the Izu Islands. On the 26th, a low pressure system accompanied by a front flew east through the Sea of Japan. The tropical cyclone gradually became obscure. On the 27th and 28th, the low pressure system proceeded northeasterly through the waters near the Kuril Islands, and the low pressure system and front gradually moved away from near Japan. High pressure gradually began to rise from the west, and low pressure areas stagnated over the East Sea of the Philippines.

#Precture
On the 22nd, due to the rainy season front, rain began mainly on the Sea of Japan side of the north to western Japan. Heavy rain of 33.0mm/h was observed in Itsuhara, Nagasaki Prefecture, and heavy rain was also seen in parts of Hokuriku. On the 23rd, heavy rain was 100mm per hour near Niimi City, Okayama Prefecture, and information on record-breaking short-term heavy rain was announced nationwide, the first in the year. On the 24th, extremely heavy rain began in the Tokai region and the Kii Peninsula. A total of 76.0mm/h was observed in Yuasa Town, Wakayama Prefecture. On the 25th, heavy rain began in the west and eastern Japan due to the effects of the fronts associated with the cyclone and the warm and humid air associated with the tropical cyclone. In Kamiishizu, Ogaki City, Gifu Prefecture, extremely heavy rain at 68.0mm/h, the number one in history, was observed. On the 26th, a band-shaped rain cloud accompanied by the cold front passed westward around Honshu. Heavy rain in Gojo City, Nara Prefecture was hit by a daily rainfall of 120.0mm. On the 27th, the end of the rainy season was announced in southern and northern Kyushu, Chugoku, Shikoku, and Kinki. The end of the rainy season during June is the first time in statistics history. In Hokkaido, record-breaking short-term heavy rain information has been announced in northern Urahoro Town and Ikeda Town. On the 28th, some heavy rain fell on the Sakishima Islands in Okinawa, and there was no noticeable precipitation around Honshu.

#Temperature
On the 22nd, the heat is almost over reaching its temperature in Kanto, Koshin, southern Tohoku, and Hokuriku. Itoigawa, Niigata Prefecture, was a hot day of 36.1 C, and the number one spot in June was updated. On the 23rd, the heat eased in western Japan due to rain, and the heat continued in Kanto. On a hot day in Otsuki City, Yamanashi Prefecture and Kuki City, Saitama Prefecture. It was a tropical night in central Tokyo. On the 24th, temperatures rose in the heart of northern Japan, which was covered in high pressure. Tsubetsu Town, Hokkaido, recorded a temperature of 34.4 degrees Celsius, which was hotter than Okinawa. On the 25th, the temperature reached high temperatures, mainly on the Sea of Japan side of northern Japan and western Japan, and Kitami City recorded a temperature of 34.9 C. On the 26th, temperatures rose in Kanto, China, Kyushu and other places where the impact of the rainy season front was small. The temperature rose to 32.9 C in central Tokyo. It is in Kitami City (34.0c) and Asahikawa City (31.0c) in Hokkaido, and other places are located on the midsummer day. On the 27th, the sun was widely exposed to the west and eastern Japan, and on extremely hot days in Kamimon, Miyazaki Prefecture (35.1c), Ainancho, Ehime Prefecture (35.0c), and Kofu (35.0c). On the 28th, the number of midsummer days in central Tokyo in June will be on the 11th. Due to the effects of cool air, the temperature on the Sea of Okhotsk side of Hokkaido was 16.6 C in Abashiri, reaching the same temperature as late May.

Typhoon No. 3 (Moon) occurs; be careful of strong winds, high waves, sudden rain and thunderstorms in the Ogasawara Islands.

2025/07/03 05:50

Today, the 3rd (Wednesday), around 3am, a tropical cyclone developing in the waters near the Ogasawara Islands became Typhoon No. 3.

#Typhoon No. 3 - Wednesday, 3:00 am
====
Center location: Ogasawara waters
Moving speed: Northwest, 20 km/h
Center pressure: 1002 hPa
Maximum wind speed: 18 m/s (near the center)
====



Typhoon No. 3 is already approaching the Ogasawara Islands, and is expected to head northwards over the sea east of the Ogasawara Islands in the future. In the Ogasawara Islands, you will need to be careful of strong winds and high waves with swells, sudden rain and thunderstorms up to tomorrow, the 4th (Thursday).



Current forecasts show that the chances of landing in Honshu are low, and it is unlikely to occur with a storm with a wind speed of 25m/s or more. However, the large size of the forecast circle that indicates the expected course for the typhoon is large, resulting in greater uncertainty in predicting the course. Please be aware of the latest typhoon information that will be updated in the future.

Sea surface temperature in the seas near Japan is higher than normal in the central Japan Sea. Summary of the oceans (June 22-28, 2025)

2025/07/02 12:57

Sea surface temperatures in the waters near Japan continue to be in areas higher than normal.
In particular, on the continental side of the central Japan Sea, the temperature was up to 5 C higher than normal.
Below is a summary of the oceans (June 22-28, 2025)



#Pressure arrangement and waves
On the 22nd-24th, the rainy season front extending from the Sea of Japan to northern Japan gradually moved south, stagnating near Honshu.
High pressure in the far east of Japan protrudes south to the south of Japan, increasing the slope of pressure between the front line and the front.
Waves have risen slightly in the east of Japan.
Tropical cyclones in the waters near Ogasawara developed into Typhoon No. 2 on the 23rd.
Press northwest with strong winds.
The waves rose in the waters near Ogasawara, and it broke down on the 24th.
On the 25th, Typhoon No. 2 became a tropical cyclone, moving north south of Hachijojima.
On the 26th, we reached south of Kanto and headed northeast.
Waves have risen in the waters near the Izu Islands and off the coast of Kanto.
On the 27th and 28th, the front stretched out to the Pacific side from a low pressure system that proceeded northeasterly in the east of Hokkaido, and waves rose in the east of Japan.



#Sea surface temperature
The sea surface temperature in the Japanese seas is higher than normal in the northern and central parts, and the seas on the continent have expanded considerably.
On the central continental side, the temperature was up to 5 C higher than normal.
The western part is on average.
The East China Sea and the Pacific Ocean have expanded to include higher than normal waters.
It is much higher than normal offshore Shiosaki, where the Kuroshio Current is docked.
The off Sanriku area continued to be significantly higher than normal, with a maximum of 4 C higher.
/The southern coast of Hokkaido and the southern Sea of Okhotsk are also in considerable heights
/
In the southern Sea of Okhotsk, the temperature has increased by up to 4 C.

"Typhoon No. 3" soon appears; approaches Ogasawara immediately after the typhoon, fears of heavy rain; what will the impact on Honshu

2025/07/02 11:17

Today, Wednesday, July 2nd, at 9am, the Japan Meteorological Agency announced that it is expected to develop into a typhoon within the next 24 hours regarding the tropical cyclone developing in the waters of Ogasawara.


If a typhoon occurs next, it will be called Typhoon No. 3.



The tropical cyclone is moving north-northwest as of 9am today (Wed)

As of 9am today,
.

The air pressure in the center is 1006hPa, the maximum wind speed is 15m/s, and the maximum instantaneous wind speed is 23m/s.

In the Ogasawara Islands, active rain clouds spreading to the north of the typhoon are expected to hit the surface, and the rain is likely to increase from tonight to tomorrow, the 4th (Friday).

: The slow movement of the typhoon may cause the impact to last longer.


Also, if the rain clouds stagnate or develop more than expected, there is a possibility that heavy rain will occur at the level of an alarm, so
/You should continue to pay attention to the latest typhoon information.



#What is the impact on Honshu #
They will be closest to the Ogasawara Islands from the evening of the 3rd (Thursday) to the morning of the 4th (Friday), and after that they are expected to move east of Japan.

For now, the possibility that a typhoon that changes from a tropical cyclone will approach
Honshu is low, but the forecast circle from Sunday the 6th onwards is wide, and there are still some areas where the typhoon movement from next week onwards is highly uncertain.


We need to continue to be careful about typhoon trends.

Kanto: Weather changes suddenly when you get home: Very unstable Atmosphere condition: What has ended after the rainy season Western Japan has already seen its intense heat and tropical nights every day

2025/07/01 11:59

Weekly Weather Forecast
#Western Japan The rainy season has ended in the history of statistics. The extreme heat and tropical nights have already come out every day. Eastern Japan, including Kanto, atmospheric instability. Beware of sudden, severe thunderstorms
#Rain in northern Japan on weekends
#When will the rainy season end in eastern Japan and Tohoku



#Western Japan The rainy season has ended in statistical history. As the days and days of extreme heat and tropical nights
In the future, the tall high pressure system is expected to slowly move its center from western Japan to the East China Sea.
Western Japan will be covered in high pressure and sunny weather, with the summer sun shining brightly.
There are some days when it's extremely hot every day, and Tanabata Day on Monday the 7th will likely be a dangerous heat in Kyoto with a maximum temperature of 37 C.
Also, some places are expected to be tropical nights with a minimum temperature of 25 C or higher, so it is likely that nights that are difficult to sleep in will soon arrive.
The other day, on Friday, June 27th, it was announced that the rainy season will end in western Japan about three weeks earlier than usual.
The rainy season has ended in northern Kyushu, Shikoku, Chugoku, and Kinki, the earliest since statistics began.
Because the rainy season ended early, it looks like it will be a hot and tropical night every day since July starts.
Please take full precautions against heatstroke more than usual.





#East Japan, including Kanto, atmospheric instability Beware of sudden, severe thunderstorms
Tall high pressure systems overhang near western Japan, and many days when warm, humid air around the edge of the high pressure systems flows into eastern and northern Japan.
Clicking will likely spread in eastern and northern Japan from now on.
It is expected that the day when sunlight reaches through the gaps between the clouds will be extremely hot in eastern Japan.
Also, due to the warm, humid air surrounding the edge of the high pressure system, the warm, humid air during the day, and the cold air above, the air condition will become unstable in the afternoon, around Thursday the 3rd, mainly in the eastern Japan.
Beware of sudden, heavy rain, lightning, and gusts of wind that are locally accompanied by lightning.
If the rain clouds stagnate, there is a risk of heavy rain at the level of an alarm.



#Rain in northern Japan on weekends
From Saturday the 5th to Sunday the 6th, a low pressure system is expected to progress to the Sea of Okhotsk.
There will be some areas where rain will fall in northern Japan, mainly in Hokkaido.
Even in northern Japan, temperatures tend to be higher than normal even on cloudy or rainy days, and some places are expected to be midsummer days.

#When will the rainy season end in eastern Japan and Tohoku
The rainy season front is expected to not stagnate near Honshu in the future.
However, this week, the summer high pressure system will spread out around western Japan, so the weather will be unclear in eastern Japan and Tohoku, and it seems unlikely that there will be an announcement of the end of this week's rainy season.
Next week, from Tanabata to Tuesday, the 7th, next week, around Tanabata to Tuesday, the 8th, high pressure will widen the area around Honshu, and more places will be sunny in eastern Japan and Tohoku.

The heat continues to be extremely hot, mainly in eastern and western Japan; the first heat stroke alert alert for the year is announced in Gifu and Tottori

2025/07/01 06:32

Today, the high pressure system continues to be covered in high pressure, and the sun is expected to reach Eastern and Western Japan. In addition, even in northern Japan, where clouds tend to spread, temperatures are high, and many places continue to be over average.

The forecast maximum temperatures are 29c in Sapporo, 32c in Sendai, 33c in Tokyo, 36c in Nagoya, 32c in Kanazawa, 32c in Osaka, 35c in Kochi, 33c in Fukuoka.
In Eastern Japan and Western Japan, there will be some hot days that exceed 35 C, and some places will be expected to be over 35 C. We need to continue to be vigilant against heat stroke. The temperatures will also rise in northern Japan, making it a sultry and humid atmosphere. Take measures against the heat, such as keeping hydrated frequently.



The Ministry of the Environment and the Japan Meteorological Agency have issued heatstroke warning alerts from western to eastern Japan, and have announced areas in 22 locations in 20 prefectures. This was the first announcement this year in Gifu and Tottori prefectures.


In areas where a heatstroke warning alert has been issued, significantly higher temperatures can cause damage to human health due to heatstroke.
Please refrain from activities during hot weather and try to take frequent breaks, drink water, and drink salt.
Also, make sure to stay in a cool environment, such as using air conditioners indoors, and take full advantage of heatstroke prevention indoors.

Weather today, Tuesday, the 1st: Unstable atmospheric conditions over a wide area. Be careful of sudden thunderstorms even when it's sunny

2025/07/01 06:08

Today, the 1st (Tuesday), which marks the start of July, will be covered in high pressure areas around Japan and many sunny spots, but due to the effects of humid air and cold air above, this will be a day where you will need to be careful of local thunderstorms. We also need to be vigilant about the heat.



In northern Japan, clouds are likely to spread due to the influence of atmospheric valleys.
In the afternoon, there are localized showers and thunderstorms, so it's safe to have a folding umbrella when you go out.



There are many places in Eastern and Western Japan where sunlight is reachable. However, rain clouds will develop inland areas and mountains in the afternoon, leading to heavy rain and thunderstorms. Be careful of lightning strikes, gusts of wind, and hail fall.
Active rain clouds can flow into the plains, causing sudden thunderstorms, so be careful not to change the sky pattern, and when you go out, you can rest assured that you have a folding umbrella.

Temperatures continue to be higher than normal nationwide, with severe heat continuing, especially in eastern and western Japan. Don't forget to take measures against heat stroke.

Western Japan: The extreme heat and tropical nights have already been happening every day, and the atmosphere is unstable in the Kanto region, and be careful of sudden, severe thunderstorms. When will the rainy season end

2025/06/30 13:15

Weekly Weather Forecast
#Western Japan The rainy season has ended in the history of statistics. The extreme heat and tropical nights have already come out every day. Eastern Japan, including Kanto, atmospheric instability. Beware of sudden, severe thunderstorms
#Rain in northern Japan on weekends
#When will the rainy season end in eastern Japan and Tohoku



#Western Japan The rainy season has ended in statistical history The heat has already ended every day and tropical nights
The other day, on Friday, June 27th, it was announced that the rainy season has ended in western Japan about three weeks earlier than usual.
The rainy season has ended in northern Kyushu, Shikoku, Chugoku, and Kinki, the earliest since statistics began.
July will start tomorrow, the 1st (Tuesday).
Now, the tall high pressure system is expected to slowly move its center west.
Western Japan will be covered in high pressure and sunny weather, with the summer sun shining brightly.
There are some days when it's extremely hot every day, and Tanabata Day on Monday the 7th will likely be a dangerous heat in Kyoto with a maximum temperature of 37 C.
Also, some places are expected to be tropical nights with a minimum temperature of 25 C or higher, so it is likely that nights that are difficult to sleep in will soon arrive.
Because the rainy season ended early, it looks like it will be a hot and tropical night every day since July starts.
Please take full precautions against heatstroke more than usual.





#East Japan, including Kanto, atmospheric instability Beware of sudden, severe thunderstorms
Tall high pressure systems overhang near western Japan, and many days when warm, humid air around the edge of the high pressure systems flows into eastern and northern Japan.
Clicking will likely spread in eastern and northern Japan from now on.
It is expected that the day when sunlight reaches through the gaps between the clouds will be extremely hot, especially in eastern Japan.
Also, due to the warm, humid air surrounding the edge of the high pressure system, the temperature rise during the day, and the cold air above, the air condition will be unstable in the afternoon, mainly in the eastern Japan, around Thursday the 3rd.
Beware of sudden, heavy rain, lightning, and gusts of wind that are locally accompanied by lightning.
If the rain clouds stagnate, there is a risk of heavy rain at the level of an alarm.



#Rain in northern Japan on weekends
From Saturday the 5th to Sunday the 6th, a low pressure system is expected to progress to the Sea of Okhotsk.
There will be some areas where rain will fall in northern Japan, mainly in Hokkaido.
Even in northern Japan, temperatures tend to be higher than normal on cloudy and rainy days, and some are expected to be midsummer days.

#When will the rainy season end in eastern Japan and Tohoku
The rainy season front is expected to not stagnate near Honshu in the future.
However, the high pressure system in the summer spreads around western Japan, so the weather is unclear in eastern Japan and Tohoku.
It seems there is no announcement about the end of this week's rainy season.