Be careful of violent gusts of winds such as tornadoes and other severe rains in Hiroshima and Shimane prefectures.

2025/07/08 17:37

It was believed that around 4:20-30pm today, about 110mm of heavy rain was falling in Hiroshima and Shimane prefectures in an hour, and the Japan Meteorological Agency released a record short period of heavy rain.

In the Chugoku region, warm, humid air and rising daytime temperatures make the atmosphere extremely unstable. The rain clouds and thunder clouds that have developed overnight will continue to be prone to appearing, so even if the rain has subsided, you should not let your guard down.

In the Chugoku region, this is a common occurrence up tonight, with the Sanyo region where there could be a heavy rain of 80mm per hour, and the Sanin region where there could be a very heavy rain of 50mm per hour.
Please be careful of low-lying land flooding, rising rivers, landslides, etc.



In addition, in Hiroshima and Shimane prefectures, severe gusts of winds such as tornadoes are prone to occur, and the Japan Meteorological Agency has issued a tornado warning.


We will continue to be a weather situation where severe gusts of winds such as tornadoes will likely occur in the future, so please be careful about the situation in the sky.


If a tornado approaches,
If you are indoors, close the windows and curtains, move away from the window, or move to a room without a window, or get under a sturdy desk to protect your head.


If you are outdoors, it is important to hide behind the objects of a sturdy building and protect your head and neck.
It is dangerous to store sheds, garages, and prefabricated ones.
If there is no evacuation site, lie in the shade or ditch.

The sea surface temperature in the seas surrounding Japan is significantly higher than normal [Marine summary June 29th - July 5th, 2025]

2025/07/08 15:51

Until the first half of June, the sea surface temperatures in the Japanese Sea and off the coast of Sanriku were as low as normal or as low as normal, but by the end of June, the sea surface temperatures changed to high.

From around June 30th, the sea surface temperature has been high, exceeding 5 C or more than normal on the Taishosho side of the Japanese Sea.


The sea surface temperature is also rising again off the coast of Sanriku.


On the other hand, in the waters near Ogasawara, where Typhoon No. 3 has passed, seawater has been mixed in, and the sea surface temperature has been as low as normal or slightly lower.


Below is a summary of the oceans from June 29th to July 5th, 2025.



#Pressure configuration and waves
From June 29th to July 1st,
The area around Honshu was covered with a mobile high pressure system.
Waves in the waters around Japan remained calm at a wave height of less than 1m.

On the 2nd, a tropical cyclone emerged in the waters near Ogasawara.
Waves rose in the waters near Ogasawara, surrounding the tropical cyclone, and at night the wave height reached 3m.

At 3am on the 3rd, the tropical cyclone became Typhoon No. 3 in the waters near Ogasawara, and proceeded from the north.
On the 3rd, there was a water area that had exceeded 4m in the east of Ogasawara.
On the other hand, the waves continued to move calmly in the waters surrounding Honshu.
/BTYphoon No. 3 heads north east of Japan from the 4th to the 5th.
Wave height is around 3m around the typhoon.
The area around Honshu remained calm and unaffected by the typhoon.



#Sea surface temperature
The sea surface temperature in the Japanese Sea was significantly higher than normal on the northern and central continental sides, with a maximum of 6c higher.


In the western part of the year, the seas above normal have expanded.
The East China Sea also expanded significantly higher than normal, with the maximum temperature increase of 4 C.

The Pacific side was much higher than normal, off Shiosaki, where the Kuroshio Current is docked.
The off Sanriku offshore is also much higher than normal, with a maximum of 5 C higher.
The sea surface temperature east of Ogasawara, where Typhoon No. 3 passed, has fallen slightly below normal or slightly lower.


/B/The southern coast of Hokkaido and the southern Sea of Okhotsk continue to be quite high.
In the southern Sea of Okhotsk, the temperature has increased by up to 5 C.

The rainy season front revives due to a typhoon; fears of heavy rain in Kanto and other areas from tomorrow onwards [Weekly Weather]

2025/07/08 12:21

Until now, there have been two typhoons around Japan, and of these, Typhoon No. 3 (Moon) has been transformed into a temperate cyclone in the east of Japan at 9am today, Tuesday, July 8th.

This low pressure system of former Typhoon No. 3 will become integrated with the front by night, and is expected to extend to the area around Honshu from tomorrow, the 9th (Wednesday).



From tomorrow, the 9th (Wednesday) to Thursday the 10th, the front will be a rainy season front, and
The front will travel south from the Tohoku region to the Kanto region.

The rainy season front will revive due to a typhoon, and there is a risk that heavy rain will occur at an alarm level in Kanto and other areas.




When the wind that lets rain clouds flow is weak or when the front is stagnant,
The rain clouds may not move and rain may continue to fall in similar places.

Depending on the movement of the front line tomorrow, Wednesday the 9th to Thursday the 10th, there may be heavy rain that is beyond expectations and localized.

Tomorrow, Wednesday the 9th, you will be focused on the southern Tohoku and Kanto region, and on Thursday the 10th, you will need to be careful and be vigilant in the Kanto and Koshin region.



As of 9am today, another Typhoon No. 4 (Danus) is slowly moving north-northwest through the East China Sea.


It is expected to become a tropical cyclone by tomorrow, the 9th (Wednesday).

In the Okinawa region, where humid air around the typhoon flows through, there will be some areas where heavy rain or thunderstorms will occur today evening.
Please be careful of lightning strikes and gusts of wind.



In addition, a low pressure system will occur in the south of Okinawa by tomorrow night.
It is not yet known whether this low pressure will become a typhoon or not, but
As the humid air around the low pressure that will occur in the future flows into the Pacific side of Honshu,
/The weather is expected to return again in western Japan and Tokai regions, where the rainy season has ended.



From the second half of the week, there will be more cloudy and rainy areas, so
The intense heat up until now has subsided, but
With warm, humid air from the tropical flows one after another from the south, it looks like it will become even more muggy than
.


Please be careful of future trends in low pressure systems and the latest weather information.

Today, the 8th, the extreme heat continues, and warning against heat stroke. Akita's first heat stroke warning alert for the year

2025/07/08 06:27

Today, the 8th, the area around Japan is expected to be covered by a wide range of high pressure, and temperatures are expected to rise nationwide.
The estimated maximum temperatures are 30c in Sapporo, 32c in Sendai, 35c in Tokyo, 34c in Nagoya, 35c in Osaka, 35c in Kochi, 33c in Fukuoka.


In Hokkaido, where sunny day is clear throughout the day, it is expected to be extremely hot every day in Obihiro. Although clouds have spread in eastern and western Japan compared to the day before, temperatures continue to be higher than normal, and the weather is expected to be extremely hot in various places with temperatures exceeding 35 C.
Yesterday (7th) In central Tokyo, which recorded the first extremely hot day of the year, today (8th) will also be a very hot day. Please be careful not to get sick from the extreme heat every day.



The Ministry of the Environment and the Japan Meteorological Agency have issued heatstroke warning alerts from western to northern Japan, and have been announced in 28 regions. This is the first announcement this year in Akita Prefecture, and this is the third consecutive day in central Tokyo.


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 the hot days as much as possible, and try to take frequent breaks, drink water, and salt.
Also, use air conditioners indoors to make sure you live in a cool environment and take full advantage of heat stroke prevention indoors.

Weather today, Tuesday the 8th: The weather may change dramatically in Tohoku to Kyushu; be careful of the strengthening rain in Okinawa

2025/07/08 05:56

Today, the 8th (Tuesday), the area around Japan is expected to be covered by high pressure. There will be many sunny spots, but there will be sudden thunderstorms in the afternoon, so the sky will likely be something you can't be careless.



Hokkaido will have sunlight throughout the day. The weather won't go wrong, and it's fine to dry your laundry. It will be extremely hot, so be careful of heat stroke.


Although there are some areas where clouds spread out from Tohoku to Kyushu, there will be many areas where the sun will reach. Local rain clouds are expected to develop in the afternoon, mainly inland areas and along mountains. When you go out, it's safe to carry an umbrella that can be used in both sunny and rainy weather. Please be careful of changes in the sky as there is a possibility of showers in the plains as there is a possibility of rain showers.


Weather in Okinawa is prone to rain due to the humid air flowing around Typhoon No. 4. Care must be taken as there is a risk of localized heavy rain or thunderstorms.

Typhoon No. 4: How long will it be Honshu: The intense heat and tropical nights: Be careful of sudden changes in the afternoon weather.

2025/07/07 11:58

Weekly Weather Forecast
#Double typhoons occurring The Sakishima Islands approaching Typhoon No. 4 is likely to cause a major storm
#Warning for dangerous heat and sudden changes in weather that exceeds body temperature
#Later of the week Cloudy and rain The fierce heat will calm



#Double typhoons occurring The Sakishima Islands approaching Typhoon No. 4 is likely to cause a major storm
As of 9am today, Monday the 7th, Typhoon No. 4 (Danus) is heading north through the Taiwan Strait. In the Sakishima Islands in Okinawa, which are close to typhoons, some areas are in strong winds with wind speeds of 15m/s or more, and some have issued wave warnings and high wind warnings.



As Typhoon No. 4 approaches the Sakishima Islands, today, the 7th (Monday) will be the peak of rain and wind.
Today, the 7th (Monday), there are some major areas in the coastal waters of the Sakishima Islands. Beware of high waves accompanied by swells.
Also, there will be heavy localized rain with lightning.
Please be careful of landslides, flooding in lowlands, and flooding of rivers. If the developed rain clouds around the typhoon stagnate, there is a risk of heavy rain at the level of an alarm.
There are likely some areas where there will be very strong winds, so be careful of strong winds.



Please be careful of high waves on Okinawa main island. You should be careful of sudden heavy rain, lightning strikes, and gusts of wind.
In the future, Typhoon No. 4 will travel through the Taiwan Strait and enter the East China Sea, and will be blocked by high pressure systems tomorrow, the 8th (Tuesday), and will turn west. It will land on the continent on the 9th (Wednesday), and will turn into a tropical cyclone on the continent at 9am on the 10th (Thursday).


Typhoon No. 3 in the eastern part of Japan is expected to move northwards in the future, then change its path to northeastern part, and it is expected to turn into a temperate cyclone in the east of the Kuril Islands by 9am on the 9th (Wednesday). There will not be a direct impact on Japan.


#Beware of dangerous heat and sudden changes in weather that exceed body temperature





In the first half of the week, the Pacific high pressure area around Honshu will be covered in summer, and the sun will be shining in Kanto, Koshin, Hokuriku, and Tohoku, which have not yet been announced to the end of the rainy season.
There are many days with quite high temperatures, mainly in western Japan, and there are some areas where it is dangerously hot that exceeds body temperature.
Please take full precautions to prevent heatstroke from getting sick every day and tropical nights.
Also, the air condition will be unstable in the afternoon due to the effects of warm, humid air during the day. Be careful of sudden, severe thunderstorms, lightning strikes, and gusts of wind caused by sudden changes in weather.

#Later of the week Cloudy and rain The heat will subside
In the second half of the week, clouds will likely spread in the center of the Pacific Ocean due to wet winds from the east. The fierce heat has subsided and it looks like it will be free from the intense heat and tropical nights that have happened every day.
However, even in the sun, be careful of sudden heavy rain and thunderstorms.

Typhoon No. 4 will head towards Okinawa and the Sakishima Islands. Be careful of heavy rain, high waves, landslides and severe gusts of wind

2025/07/06 18:06

Typhoon No. 4, at 3pm on the 6th, is 22 10 minutes north latitude and 118 50 minutes east longitude, travels northeast at 15:00am on the 6th, at around 15km/h.
The air pressure in the center is 975 hectopascals, the maximum wind speed near the center is 30 meters, and the maximum instantaneous wind speed is 45 meters, and the wind speed is 25 meters or more within a radius of 110 km from the center.
In addition, strong winds with a wind speed of over 15 meters are blowing within 390 km southeastern side of the center and 220 km northwest side.
Typhoon No. 4 is expected to develop and move northeasterly through the Taiwan Strait, and approach the Yaeyama region on the 7th.


In the Sakishima Islands, depending on the degree of rain cloud development, there is a risk of heavy warning-level rainfall until the 7th.
Also, depending on the course of the typhoon, the 7th may be a major hit.
Be careful of strong winds and high waves accompanied by swells, landslides, flooding of low land, flooding of rivers, and severe gusts of winds such as lightning and tornadoes.



[Wave forecast]
Wave height expected on the 6th
Miyakojima region 2.5 meters with swells
Yaeyama region 3 meters with swells

Wave height expected on the 7th
Okinawa main island region 2.5 meters with swells
Miyakojima region 5 meters with swells

Yaeyama region 5 meters with swells

Wave height expected on the 8th
Okinawa main island region 3 meters With a roll
Miyakojima region 4 meters With swell
Yaeyama region 4 meters With swell


[Wind forecast]
Wind direction and maximum wind speed expected on the 6th (maximum instantaneous wind speed)
Yaeyama region Southeast wind 17 meters (30 meters)


































































































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[Rain forecast]
The expected one-hour precipitation on the 6th is high,
Miyakojima region 30mm
Yaeyama region 30mm







/B: The expected 24-hour precipitation from 6pm on the 6th to 6pm on the 7th is high,
: Miyakojima region 50mm






/B: [Disaster Prevention]
: The winds gradually increase in the Sakishima Islands from the 6th, and very strong winds will blow on the 7th, and it is expected that the coastal waters will be accompanied by swells.
Be careful of high waves and strong winds accompanied by swells.
Please note that in the Yaeyama region on the 7th, the typhoon may cause serious damage depending on the course of the typhoon.
In the Okinawa main island region, the waves are expected to rise from the 7th. Be careful of high waves.


There are expected areas where heavy rain will fall on the 6th. Be careful of landslides, flooding of low land, and flooding of rivers.
Please note that depending on the degree of rain cloud development, heavy rain may occur at the warning level up to the 7th.


In the Sakishima Islands, be careful of severe gusts of winds such as lightning strikes and tornadoes on the 7th.
If there are signs of developing cumulonimbus clouds approaching, try to ensure safety by moving inside the building.
Please be careful of lightning strikes, gusts of wind and sudden heavy rain in the Okinawa main island region over the 7th.

Typhoon No. 4: closest to the Sakishima Islands on the 7th. Beware of high waves with heavy rain and swells

2025/07/06 07:31

Typhoon No. 4 is moving at a slow speed north-northeast in the South China Sea as of 6am today, Sunday the 6th.

#Typhoon No. 4: Sunday the 6th, 6am
====
Center location: South China Sea
Moving speed: North-northeast, slow
Center pressure: 985hPa
Maximum wind speed: 25m/s (near the center)
Maximum instantaneous wind speed: 35m/s
===

Typhoon No. 4 will develop in the future pass near the Taiwan Strait towards the East China Sea, and is expected to be closest to the Yaeyama region of the Sakishima Islands on the 7th.


Wheels will gradually increase in the Sakishima Islands from the 6th, and the rocks will be accompanied by swells in coastal waters. Furthermore, due to the humid air from Typhoon No. 4, rain clouds and thunder clouds become more likely to develop, and depending on the course of Typhoon No. 4, there is a risk of heavy rain at the level of warning.
Please be careful of landslides, flooding of low landslides, and high waves at sea and coastal areas with strong winds and swells.



#Wave forecast
Wave height expected on the 6th
Miyakojima region 2.5 meters with swells
Yaeyama region 3 meters With swells

Wave height expected on the 7th
Miyakojima region 4 meters with swells


# Wind Forecast
Wind direction and maximum wind speed (maximum instantaneous wind speed) expected on the 6th:Yaeyama region: Southeast wind, 17 meters (30 meters)

Wind direction and maximum wind speed (maximum instantaneous wind speed) expected on the 7th:Miyako Island region: South wind, 15 meters (25 meters)
Yaeyama region: South wind, 17 meters (30 meters)

#Rain forecast
The hourly rainfall expected on the 6th is as follows:
Miyako Island area: 30 mm
Yaeyama area: 40 mm

The 24-hour rainfall expected from 6 AM on the 6th to 6 AM on the 7th is as follows:
Miyako Island area: 50 mm
Yaeyama area: 80 mm

Typhoon No. 4: closest to the Sakishima Islands on the 7th. Beware of high waves with heavy rain and swells

2025/07/06 07:21

Typhoon No. 4 is moving at a slow speed north-northeast in the South China Sea as of 6am today, Sunday the 6th.

#Typhoon No. 4: Sunday the 6th, 6am
====
Center location: South China Sea
Moving speed: North-northeast, slow
Center pressure: 985hPa
Maximum wind speed: 25m/s (near the center)
Maximum instantaneous wind speed: 35m/s
===

Typhoon No. 4 will develop in the future pass near the Taiwan Strait towards the East China Sea, and is expected to be closest to the Yaeyama region of the Sakishima Islands on the 7th.


Wheels will gradually increase in the Sakishima Islands from the 6th, and the rocks will be accompanied by swells in coastal waters. Furthermore, due to the humid air from Typhoon No. 4, rain clouds and thunder clouds become more likely to develop, and depending on the course of Typhoon No. 4, there is a risk of heavy rain at the level of warning.
Please be careful of landslides, flooding of low landslides, and high waves at sea and coastal areas with strong winds and swells.



#Wave forecast
Wave height expected on the 6th
Miyakojima region 2.5 meters with swells
Yaeyama region 3 meters With swells

Wave height expected on the 7th
Miyakojima region 4 meters with swells


#Wind forecast

































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Yaeyama region Southern wind 17 meters (30 meters)


#Rain forecast

Weather today, Sunday, 6th: Beware of heat stroke in western and eastern Japan; fears heavy rain in the Sakishima Islands

2025/07/06 06:14

Today, Sunday the 6th, there will be many areas around Honshu, covered in high pressure, and there will be many sunny spots. However, in northern and eastern Japan, clouds are more likely to spread due to the influence of humid air, and there is a possibility of showers and thunderstorms everywhere, especially along the mountains. It would be a good idea to have a folding umbrella when you're out.



In western and eastern Japan, the heat will be even more severe today. Today, the 6th, a heat stroke warning alert was issued from western Japan to 19 prefectures in eastern Japan. This is the first announcement this year in Tokyo and Kanagawa prefectures, and the forecast highs in the middle of the day are expected to be a 35 C hot day in central Tokyo and Yokohama.
The heat is also severe in western Japan, with the expected maximum temperature likely to be around 35 C. This can cause dangerous heat to exceed your body temperature, so please take full precautions against heat stroke.


In Okinawa, rain clouds and thunder clouds are expected to become more likely to develop due to the humid air from Typhoon No. 4 and the cold air above. In particular, in the Sakishima Islands, there are likely areas where heavy rain with thunder from the afternoon to the evening.
Also, due to the influence of Typhoon No. 4, winds will gradually increase in the Sakishima Islands from the 6th, and coastal waters will likely be swelled by tomorrow, the 7th. Be careful of landslides, flooding of low land, strong winds and high waves.