Gunma Prefecture issues record-breaking short-term heavy rainfall warning; be on high alert for landslides

2024/09/09 23:24

At around 10:10 pm on the 9th, heavy rainfall of about 100 mm per hour was observed near Matsuida-cho, Annaka City, Gunma Prefecture, and the Japan Meteorological Agency announced a record-breaking short-term heavy rainfall report.

Looking at the current landslide risk distribution (Landslide Kikikuru) situation as of 10:40 pm, the purple color "Danger, equivalent to alert level 4" is displayed around Annaka City, Gunma Prefecture. In addition, a landslide alert has been issued for Annaka City and Tomioka City, and it is a dangerous situation where a landslide could occur at any time.



In southern Gunma Prefecture, please be on high alert for landslides, and be on alert for flooding of low-lying land, rising rivers, and overflowing rivers. The situation may rapidly worsen in the future, so if you feel even the slightest bit of danger, please make the decision to evacuate to a safe place even if no evacuation information has been issued.

Temperatures on the 10th: Extremely hot days expected mainly along the Sea of ??Japan due to the Fohn effect

2024/09/09 22:49

On Tuesday, the 10th, high pressure will cover Honshu and many areas will be sunny and hot. Moist air from the tropical depression and moist air from the Pacific high pressure will cross the mountains, and many areas will experience scorching hot days, mainly on the Sea of Japan side, due to the Fohn effect.



Looking at the maximum temperatures in various areas, scorching hot days of over 35 C are expected around Honshu, mainly on the Sea of Japan side. The maximum daytime temperature is expected to be 36 C in Kurume City, Fukuoka Prefecture, Matsue City, Shimane Prefecture, Maizuru City, Kyoto Prefecture, Nagaoka City, Niigata Prefecture, and other areas. In Fukuoka, Osaka, and Nagoya, the maximum daytime temperature is expected to be 35 C, and in central Tokyo it is expected to be 34 C.



It looks like some areas along the Sea of Japan side will experience record-breaking heat for September. Please be careful and alert to heatstroke, drink plenty of fluids and salt, and try to stay in a cool environment.

Kanto: Beware of sudden heavy rain in urban areas during commute times; atmospheric conditions will be extremely unstable through tomorrow

2024/09/09 16:53

The atmospheric conditions in the Kanto region have been extremely unstable since yesterday, the 8th.
From yesterday, the 8th, to the morning of today, the 9th, a front stretched from Hokuriku to the east of Japan, and in the Kanto region, the warm and humid air flowing toward the front, the rising temperature during the day, and the cold air above made the atmospheric conditions extremely unstable.
Rain clouds and thunderclouds developed in places, and it is believed that about 100 mm of heavy rain fell in the Myogi-cho area of Tomioka City, Gunma Prefecture, from 8:40 p.m. yesterday, the 8th, and about 100 mm of heavy rain fell in the area of Takasaki City from 2 a.m. today, the 9th, and a "record short-term heavy rain information" was announced.

Although the front moved east of Japan during the day today, the 9th, the atmospheric conditions in the Kanto region remain extremely unstable due to the humid air circulating around the edge of the high pressure system and the rising temperature during the day.

As of 4:15 p.m., rain clouds have developed mainly in Chiba Prefecture, and active rain clouds are emerging locally in Tokyo.



After this, there will be rain with thunderstorms in some areas around the time you return home.
The probability of lightning is high, especially in inland areas, but rain clouds may also develop in urban areas.



In addition, warm air will flow into the Kanto region through tomorrow, the 10th, so be careful of sudden heavy rain and thunderstorms through tomorrow night.
Heavy rainfall of more than 30 mm per hour is expected in some areas, and the 24-hour rainfall until tomorrow night, the 10th, is expected to be as much as 80 mm in some areas.
Due to the heavy rain so far, the ground has become loose in some areas, so even a small amount of rain may increase the risk of landslides.

In the Kanto region, please be aware of and be on alert for flooding in low-lying areas, landslides, and rising rivers until tomorrow night, the 10th.

Double tropical cyclone formation September is typhoon season. Pay attention to future trends.

2024/09/09 16:10

At noon today, Monday the 9th, the low pressure area south of Okinawa became a tropical depression.



It will move toward the Sakishima Islands by tomorrow, Tuesday the 10th.
For now, it is not expected to develop into a typhoon.
The atmospheric conditions in the Nansei Islands, especially around Okinawa Island, will be very unstable due to the influence of the tropical depression.
Today, Monday the 9th, heavy rain is expected to fall locally.
If the rain clouds develop or stagnate more than expected by tomorrow, Tuesday the 10th, there is a risk of a heavy rain warning.

In addition, a tropical depression is expected to develop in the Mariana Islands by 9:00 p.m. today, Monday the 9th.
It is not yet clear whether it will develop into a typhoon in the future.



However, there is a possibility that it will move north from the Ogasawara Islands to the south of Japan in the future.
We need to pay close attention to future trends.

The average number of typhoons occurring in August is 5.7, and in September is 5.0, making September the second most common month after August.
The average number of typhoons making landfall in August is 0.9, and in September is 1.0, making September the most common month of the year.



Typhoon season is still ongoing, so please continue to pay attention to the latest information.

A "tropical depression" has formed south of Okinawa. The surrounding moist air could cause sudden weather changes even in distant places.

2024/09/09 14:51

A new tropical depression formed south of Okinawa at noon today, Monday the 9th.

For now, it is not expected to develop into a typhoon, but it is expected to approach and pass the Sakishima Islands tomorrow, the 10th (Tuesday).



Rain clouds spread to the north of the tropical depression, and Okinawa Island may experience heavy rain and thunderstorms tomorrow, the 10th (Tuesday), with the risk of heavy rain of warning level.
Caution and vigilance are required for flooding and landslides in low-lying areas.



Warm, humid air from the tropical depression will also flow into Honshu, making localized heavy rain and thunderstorms more likely, especially on the Pacific coast.
Beware of sudden changes in the weather.



Looking at the cloud conditions using the Himawari weather satellite, the sea surface temperature remains quite high in the ocean south of Japan, and cumulonimbus clouds are still actively developing.

There is a possibility that new tropical depressions and typhoons will form and move north in the future.
We must continue to pay close attention to the movements of tropical depressions and typhoons in the southern oceans.

Weekly weather: Extreme heat and sudden weather changes - What will the weather be like over the three-day weekend Pay attention to the movement of tropical cyclones

2024/09/09 13:38

Today, the 9th (Mon), the low pressure area south of Okinawa is expected to become a tropical depression by night and move toward the Sakishima Islands by tomorrow, the 10th (Tue).



The Nansei Islands will experience heavy rain in parts, mainly on Okinawa Island, from tomorrow, the 10th (Tue).
In addition, due to the influence of warm and humid air around the tropical depression, the Pacific side from Kyushu to the Kii Peninsula is also likely to experience rain from tonight.

From tomorrow, the 10th (Tue) to the day after tomorrow, the 11th (Wed), the low pressure will move toward the Sea of Okhotsk, and the cold front extending from the low pressure will pass through Hokkaido.
Around Hokkaido, the atmospheric conditions are expected to be very unstable due to the inflow of warm and humid air toward the front and the influence of cold air above.
Heavy rain with thunderstorms will fall locally.

On Thursday, the 12th, the front is expected to stagnate near southern Tohoku.
The number of clouds will increase in Tohoku.



#What will the weather be like from Saturday, the 14th to Monday, the 16th, over the three-day weekend
The Nansei Islands are expected to continue to have cloudy and rainy skies.
Western Japan is more susceptible to the influence of humid air than the Pacific side, so be careful of sudden changes in the weather even if the sunshine reaches you.
From the Tokai region to Tohoku, the area will be in between high pressure systems and a low pressure trough over the three-day weekend from Friday the 13th and from Saturday the 14th to Monday the 16th.
Clouds are likely to spread, so even if the sun shines through the gaps in the clouds during the day, be careful of sudden rain and thunderstorms.
Many areas in Hokkaido are expected to receive sunshine.





#Pay attention to the movement of tropical cyclones
A tropical cyclone will occur in the Mariana Islands by 9 p.m. today, Monday, the 9th.
It will be necessary to pay attention to the movement of the cyclone, such as whether it will develop into a typhoon and its course in the future.

#Weekly temperature
From Kyushu to Tokai, there will be days with extremely hot days with maximum temperatures of over 35 C.
The severe summer heat will continue, so please continue to be careful of heatstroke.

[Weather over the 3-day weekend] Lingering summer heat and sudden changes in the weather continue. Beware of tropical disturbances occurring over the South Seas.

2024/09/09 13:20

In Dazaifu City, Fukuoka Prefecture, the 50th day of scorching heat (maximum temperature over 35 C) was recorded yesterday, the 8th, and the highest annual record in Japan continues to be broken, with the severe heat continuing in various places even after September.



The severe heat will continue mainly in western and eastern Japan over the three-day weekend starting this weekend, and
Osaka and Nagoya are expected to have scorching hot days of over 35 C during the day and tropical nights of not dropping below 25 C at night.

Like last year, the severe heat is prolonged this year.
Please continue to be careful of heatstroke and other health issues.

This is also a time when you need to be careful of tropical disturbances such as typhoons.



Sea surface temperatures remain quite high in the oceans south of Japan, and cumulonimbus clouds continue to develop actively.

New tropical depressions and typhoons may form and move northward in the future, and low pressure systems (typhoons and tropical depressions) are expected to move northward in the southern ocean from the 12th (Thursday) to the 14th (Saturday).

They may suddenly become typhoons after approaching Okinawa, Honshu, etc.

Even if the typhoon or tropical depression does not approach land, the activity of the autumn rain front near Honshu may become more active due to the influence of the very warm and humid air in the surrounding area.

We need to continue to be careful of the movement of typhoons and tropical depressions in the southern seas, as well as the autumn rain front.

For now, the weather around Honshu during the consecutive holidays is expected to be more affected by the autumn rain front than the low pressure systems (typhoons and tropical depressions) in the south.

Even in areas with a sunny weather mark, there is a possibility of rain or thunderstorms near the front.
During the consecutive holidays, please take rain gear with you when you go out in preparation for sudden thunderstorms, and
Please check the latest rain cloud radar frequently.

Monday 9th: Summer heat remains intense in Tokai and Western Japan; beware of heavy rain in Kanto

2024/09/09 07:07

Today, Monday the 9th, it will be sunny from Western Japan to Tokai, with some places experiencing scorching hot weather with temperatures of over 35 C. The severe heat is expected to continue. The highest temperatures expected are 35 C in Nagoya and Fukuoka, 36 C in Osaka and Hiroshima, and 38 C in Kumamoto, and some places will experience record-breaking heat. In coastal areas on the Pacific coast, rain clouds are expected to flow in from the sea accompanied by moist air around the tropical depression that is changing from the low pressure area.



Heavy rain fell in the northern part of Kanto, including Gunma Prefecture, but the activity of the rain clouds will be subdued during the day, but rain will fall in the southern part of the prefecture at night. There is a risk of heavy rain with thunderstorms in some areas. If you are returning home late, please bring rain gear.

Hokkaido and northern Tohoku, far from the front, will be calm and sunny. Sapporo will be 27 C, and Akita will be 33 C, higher than average. The temperature difference between morning and evening and daytime will be large, so be sure to adjust your clothing accordingly.

Tropical depression approaching Okinawa, heavy rain expected to fall by 120mm by tomorrow

2024/09/09 06:18

The weather chart for 3 a.m. today (9th) shows a low pressure area (a tropical disturbance with an unclear center of cyclonic circulation) south of Japan, slowly moving westward and approaching Okinawa.



After this, the low pressure area is expected to turn into a tropical depression and approach Okinawa. Active rain clouds associated with the tropical depression will cover the main island of Okinawa, and there is a risk of heavy rain accompanied by thunder. The expected 1-hour precipitation is 40 mm in some places, and the expected 24-hour precipitation by 6 a.m. tomorrow (10th) is 120 mm in some places.

Please be careful of landslides, flooding of low-lying land, and rising rivers. Depending on the degree of development of the rain clouds, there is a risk of heavy rain of warning level by tomorrow. Please be careful of lightning strikes and strong gusts of wind such as tornadoes.



Today, the 9th, the expected maximum temperatures are 31 C in Naha and 33 C in Ishigakijima, and it will rain and feel humid. Please continue to be cautious and vigilant about heatstroke.

Weather tomorrow, Monday 9th: Afternoon showers in Kanto... Extreme heat continues from Tokai to the west

2024/09/08 18:45

Although the front will move eastward tomorrow, Monday the 9th, the Kanto region will be susceptible to the cold air above and the moist air below.

A tropical depression is approaching Okinawa.

Other regions are expected to be covered by high pressure.



In the Kanto region, there is a possibility of rain or thunderstorms during the commute home time, so be careful of sudden rain even if it is sunny.

Southern Tohoku and Koshin are also susceptible to the moist air and are likely to have cloudy weather.

In addition, as the tropical depression approaches, the area of rain will spread to the surrounding Okinawa and the Pacific side of Western Japan.

Other regions are likely to be sunny and the severe heat will continue.



Looking at the distribution of predicted maximum temperatures, purple indications indicating temperatures of 35 C or higher are widespread in places from Tokai to Kyushu.

Although mornings and evenings will be comfortable, the sun will shine like midsummer during the day, and some places will experience intense heat that is hard to believe is September.

Please be sure to take all necessary measures to prevent heatstroke tomorrow as well.