Unstable atmosphere in the afternoon. Beware of sudden changes in the weather in the Kanto, Koshinetsu and other areas.

2024/09/11 07:10

Today, the 11th (Wednesday), the atmospheric conditions are expected to become unstable in the afternoon, mainly in the Kanto-Koshin region, due to the inflow of warm and humid air around the edge of the Pacific high pressure system and the rise in temperature during the day.

Looking at the probability of lightning, it is high in southern Tohoku and eastern to western Japan.

Please be careful of changes in the weather when going out.



Even in areas without an umbrella symbol, there will be localized heavy rain and thunderstorms in the afternoon.

It is a good idea to have a folding umbrella.

If developed rain clouds approach or thunder can be heard, take action to protect yourself from lightning and gusts of wind, such as taking shelter in a nearby sturdy building.

Extremely hot days predicted for Kanto and other areas; heatstroke alert issued for 19 prefectures including Fukuoka

2024/09/11 06:10

The heat will be intense in many areas today (Wednesday, the 11th).

Heat stroke alerts have been issued for 19 prefectures, including Fukuoka, Kyoto, and Iwate, and the daily maximum heat index is expected to be 31 or higher over a wide area from Tohoku to Okinawa.

Even in areas where heat stroke alerts have not been issued, please take all necessary measures to prevent heat stroke and heat and stay in an environment with as low temperature and humidity as possible.



Today's predicted maximum temperature is expected to be 37 C in Kumamoto, 36 C in Saitama, Fukui, and Kyoto, and 35 C in Nagoya and Osaka, making it extremely hot.

The red area, which indicates a predicted maximum temperature of 30 C or higher, is spreading from Tohoku to Okinawa, and the severe heat is expected to continue over a wide area.

Even if it feels cool in the mornings and evenings, be sure to take measures to protect yourself from the heat during the day.



#What is the heat index (WBGT)

The heat index (WBGT: Wet Bulb Globe Temperature) is an index that incorporates three factors that have a large impact on the heat balance of the human body:
1. Humidity
2. The surrounding thermal environment, such as solar radiation and radiation
3. Temperature.

Typhoon Babinka forms; risk of impact on Okinawa and Amami over the weekend

2024/09/10 22:30

At 9 p.m. today, the 10th (Tuesday), a tropical depression in the Mariana Islands became Typhoon No. 13.

The typhoon is moving west-northwest at a speed of about 15 km/h.

The central pressure is 998 hPa, the maximum wind speed near the center is 18 m/s, the maximum instantaneous wind speed is 25 m/s, and strong winds of over 15 m/s are blowing within a radius of 220 km from the center.

Typhoon No. 13 will move northwestward over the ocean south of Japan, and is currently expected to have an impact around Okinawa and Amami around the 14th (Sat) to the 15th (Sun).

Prepare for typhoons early, such as strong winds and heavy rain, and pay attention to future typhoon information.

"Unprecedented wandering" Typhoon No. 10 becomes a tropical depression, Typhoon No. 11 forms and develops into a violent storm...Summary of weather and temperature (September 1st to September 7th)

2024/09/10 21:40

#Summary of the weather for this period (September 1st to September 7th)
Average temperatures were slightly higher than average nationwide, and the lingering heat was intense. In northern Japan, the front moved south and there were days when the air was autumnal, but temperatures tended to rise during the day, and in Hokkaido's Pacific and Okhotsk Sea sides, temperatures were more than 2.5 C higher than average.
Precipitation was less than average in many places nationwide, and in western Japan, many places did not observe precipitation. Tokyo and Nagoya, which were affected by the tropical depression that turned from Typhoon No. 10, also had slightly less than average, and Akita, where rain fell due to the front passing, had average precipitation.
The hours of sunshine were longer than average in western Japan, where there were many days covered by high pressure. In particular, the hours of sunshine on the Sea of Japan side of Kyushu to Chugoku region were nearly twice as long as the average. On the other hand, in Tohoku to Hokuriku, where the sunshine was blocked by clouds around the front, many places had average levels, and Niigata was only 91% of the average.



[About the weather this period]

#Characteristics of atmospheric pressure distribution
On the 1st, Typhoon No. 10 turned into a tropical depression off the coast of Tokaido at noon and slowly moved north. At night, Typhoon No. 11 formed east of the Philippines. On the 2nd, the front stagnated from Hokuriku to the east of Hokkaido. Typhoon No. 11 moved northwest and made landfall in the Philippines. On the 3rd, Typhoon No. 11 passed the Philippines. The front stagnated off the coast of Shikoku to the east of Japan. On the 4th, the front stagnated near the Izu Islands to the east of Japan, and the low pressure on the front was almost stagnant east of Kanto. Strong Typhoon No. 11 moved westward across the South China Sea. On the 5th, Typhoon No. 11 developed into a ferocious force in the South China Sea in the morning. Typhoon No. 12 formed in the afternoon east of Japan. On the 6th, a front from a low pressure area in the Sea of Okhotsk passed through Tohoku and extended into the Sea of Japan. Typhoon No. 12 moved northeast east of Japan. The tropical depression south of Japan moved slowly northwest, and in the evening it turned into a low pressure area and was almost stationary. On the 7th, the front passed through the Sea of Japan and Tohoku, and stagnated to the east of Japan. Typhoon No. 12 turned into a temperate depression east of Japan in the morning. The low pressure area moved slowly northwest south of Japan.

#Precipitation
On the 1st, heavy rain was observed mainly in Tokai and Kanto due to the influence of the tropical depression that turned from Typhoon No. 10. On the 2nd, rain fell mainly in Kinki, Tokai, and Hokuriku in the morning, and in Tohoku in the afternoon, and it rained locally heavily in Tohoku, northern Kanto, and Tokai. On the 3rd, rain came and went in Tokai and Kanto-Koshin, and in Kanto-Koshin, it was very heavy rain with thunderstorms in some areas. On the 4th, rain clouds appeared locally in Okinawa, and it rained somewhat heavily. In Tokai, the rain intensified locally. On the 5th, heavy rain fell locally on Okinawa Island and the Kii Peninsula. A cold front approached Hokkaido, and rain fell late at night on the Sea of Japan side and the Sea of Okhotsk side, and it temporarily intensified. On the 6th, the atmospheric conditions became unstable in Okinawa and Amami, and heavy rain fell locally. In Hokkaido, the rain caused by the front's passage remained until the morning. On the 7th, heavy rain fell locally in Tohoku and northern Kanto, which are near the front. The atmospheric conditions became unstable in Okinawa as a low pressure area approached, and very heavy rain was observed.

#Temperature
On the 1st, there were many clouds from Kanto to Kinki, but the temperature was high and it was muggy. On the 2nd, the lingering heat was intense, especially in the Kanto region, and scorching hot days returned. In Hokkaido, autumn air was replaced by the front moving south. On the 3rd, intermittent rain fell in the Kanto region due to the influence of the front, and the maximum temperature in Tokyo was 27.4 C, 6.7 C lower than the previous day. In sunny western Japan, temperatures rose mainly in Kyushu to Chugoku and Shikoku, but only two locations experienced scorching hot days. On the 4th, radiation cooling intensified the cold in Hokkaido in the morning. There was a large difference in temperature between day and night, with a daily difference of 21 C in Takinoue. The lingering heat was intense in western Japan and Tokai, and some places experienced scorching hot days. On the 5th, midsummer days were experienced in various places from Tohoku to Okinawa. In Dazaifu City, Fukuoka Prefecture, the temperature rose to 35.0 C, breaking the record for the 47th day of scorching hot days, the most in Japan. On the 6th, the lingering heat continued in eastern and western Japan, and some places experienced scorching hot days. On the 7th, temperatures rose in eastern and western Japan, south of the front, and the number of places experiencing extremely hot days increased from the previous day. North of the front, morning and evening temperatures were low, and the daily range was large.

Tomorrow, the 11th (Wednesday) - Summer heat lingers in the Kanto region and west, while a front passes through Hokkaido, bringing autumn air

2024/09/10 18:51

Tomorrow, the 11th (Wednesday), many areas west of Kanto will be sunny, and the severe summer heat will continue. The expected maximum temperature is 34 C in Tokyo, 32 C in Niigata, and 35 C in Nagoya and Hiroshima, and some areas in eastern and western Japan will experience scorching heat. Even if it is sunny, you should be careful of sudden changes in the weather, such as sudden heavy rain and thunderstorms.



Meanwhile, a cold front will pass through Hokkaido. It will rain mainly in the morning, but it will be temporary and the weather will recover rapidly from the north. Covered by autumn air, you can expect clear blue skies after the weather improves. The expected maximum temperature is 25 C in Sapporo, 26 C in Asahikawa, and 27 C in Obihiro, so it will be a comfortable weather.

The typhoon that has turned from a tropical depression is moving away from Okinawa, but moist air is flowing in. Tomorrow will also see intermittent rain, and the rain may get heavier. Be careful of sudden heavy rain and lightning.

Latest El Nino monitoring report: High probability of La Nina occurring through winter

2024/09/10 18:30

Today, the 10th (Tuesday), the Japan Meteorological Agency announced the latest El Nino monitoring report (current situation in August 2024 and outlook for September 2024 to March 2025).
According to the Atmospheric and Oceanic Department of the Japan Meteorological Agency, the current situation is considered to be normal, with neither El Nino nor La Nina phenomena occurring.
However, it is said that the characteristics of the La Nina phenomenon are approaching.
Although there is a possibility that normal conditions will continue into the winter (40%), there is a higher possibility of a La Nina phenomenon occurring (60%).



#Current situation in August Announced by the Atmospheric and Oceanic Department of the Japan Meteorological Agency
The difference from the standard value of the sea surface temperature in the El Nino monitoring area in August was -0.5c, which was lower than the standard value.
The sea surface temperature in the equatorial Pacific was higher than normal in the west and lower than normal in the east.
The ocean surface temperature in the equatorial Pacific was higher than normal in the west and lower than normal in the central to eastern parts.
Convective activity near the date line in the equatorial Pacific was almost normal, and the easterly winds (trade winds) in the lower atmosphere in the central equatorial Pacific were also almost normal.
These atmospheric and oceanic conditions are considered to be normal conditions when neither El Nino nor La Nina is occurring, but they indicate that they are approaching the characteristics of a La Nina event.



#Future outlook Announcement by the Atmospheric and Oceanic Department of the Japan Meteorological Agency
According to the current situation, cold water on the ocean surface is seen in the central to eastern equatorial Pacific.
The atmosphere-ocean coupled model predicts that as trade winds strengthen in the western to central equatorial Pacific Ocean and cold water in the central to eastern Pacific Ocean further strengthens, sea surface temperatures in the El Nino monitoring area will likely remain below the standard value through winter.
After that, it is predicted that as warm water in the west moves eastward, the sea surface temperature will rise through spring and approach the standard value.
For these reasons, there is a possibility that normal conditions will continue through the winter (40%), but there is a higher probability of a La Nina phenomenon occurring (60%).

[Weekly weather] Extreme heat continues and weather changes suddenly; 3-day weekend typhoon approaches Okinawa

2024/09/10 17:57

A cold front is expected to pass through Hokkaido tomorrow, the 11th (Wednesday).
In Hokkaido, there will be temporary rainfall mainly in the morning when the front passes.
Due to the influence of warm and humid air heading towards the front and cold air above, heavy rain accompanied by thunder is expected to fall locally.
A tall high pressure system will cover the area around Honshu, and many areas from Tohoku to Kyushu will receive sunlight, and some areas will experience extremely hot days.
However, due to the influence of humid air around the edge of the high pressure system and the rise in temperature during the day, the atmospheric conditions are expected to be unstable in the afternoon.
Be careful of sudden heavy rain and thunderstorms.

In addition, the tropical depression near Miyakojima is expected to develop into a typhoon tomorrow, the 11th (Wednesday), and gradually move away from Okinawa.
Due to the influence of humid air in the surrounding areas, clouds will spread in Shikoku, southern Kyushu, and the Nansei Islands, and some areas will experience rain.
Be careful of sudden heavy rain and thunderstorms, especially in Okinawa.



From the day after tomorrow, Thursday the 12th, low pressure systems and fronts will frequently pass through northern Japan.
Rain is expected in Tohoku on Sunday the 15th and in Hokkaido on Tuesday the 17th.
Although there will be many days of sunshine from Hokuriku to Kyushu, be careful of sudden rain and thunderstorms in the afternoon.
When enjoying outdoor leisure activities during the three-day holiday, you should be careful of changes in the weather.
Even if there are sunny days in Okinawa, the weather will be changeable.
In addition, the tropical depression in the Mariana Islands is expected to develop into a typhoon tomorrow, Wednesday the 11th.
It will approach Okinawa around Saturday the 14th to Sunday the 15th during the three-day holiday.
Okinawa is likely to experience rough weather from the 14th (Sat) to the 15th (Sun).
Please pay attention to the latest information.

The maximum daytime temperature will be significantly higher than average, mainly in eastern and western Japan.
In the Kanto to Kyushu areas, there will be places where the temperature will exceed 35 C, and the severe heat is expected to continue.

Tropical depressions A and B could become double typhoons, one of which could approach Okinawa during the three-day weekend

2024/09/10 16:20

As of noon today, the 10th (Tuesday), tropical depression b near Miyakojima is expected to develop into a typhoon tomorrow, the 11th (Wednesday).
It will gradually move away from Okinawa.



The atmospheric conditions in Okinawa are expected to be unstable tomorrow, the 11th (Wednesday).
Please continue to be careful of sudden heavy rain.

In addition to tropical depression b near Miyakojima, tropical depression a has also formed near the Mariana Islands.



In the future, this tropical depression A will move northwestward while developing near the Mariana Islands, and is expected to develop into a typhoon in the Mariana Islands at noon tomorrow, the 11th (Wednesday).
After that, it will move northwestward while developing further, and reach the south of Japan at 9:00 a.m. on the 13th (Friday).
From the 14th (Saturday) to the 15th (Sunday), it is expected to pass near Okinawa and move into the East China Sea.

Okinawa may be affected by this typhoon from the 14th (Saturday) to the 15th (Sunday) during the three-day holiday.
The weather will gradually become rough.
Please pay attention to the latest information.

Tropical depression near Okinawa may develop into a typhoon

2024/09/10 12:21

As of 9:00am today (10th), the Japan Meteorological Agency announced that a tropical depression north of Miyakojima in Okinawa is expected to develop into a typhoon within 12 hours. It is expected to move away from Okinawa after this.

#Tropical depression Actual situation at 9:00 on the 10th
Center position Approximately 150km north of Miyakojima
Movement West-northwest 20km/h
Central pressure 1000hPa
Maximum wind speed 15m/s ((near the center)
Maximum instantaneous wind speed 23m/s

Due to the tropical depression, the rain started to get heavier from noon yesterday (9th), and in the northern part of Okinawa Island, more than 120mm of rain fell in an hour, and a record short-term heavy rain report was announced. The 24-hour rainfall up to 8:30 am on the 10th was 166.5mm in Motobu Town, Okinawa Prefecture, and it is heavy rain.

A tropical depression near the Mariana Islands is expected to become a typhoon and approach the Nansei Islands.

2024/09/10 06:48

A tropical depression formed near the Mariana Islands around 9:00 p.m. yesterday, the 9th, and it is highly likely that this tropical depression will become a typhoon by tomorrow.

According to the current situation at 3:00 a.m. today, the tropical depression near the Mariana Islands has a central pressure of 1002 hPa, a maximum wind speed of 15 m/s near the center, and a maximum instantaneous wind speed of 23 m/s, and is moving slowly to the west-northwest.



Looking at the predicted course as of 3:00 a.m. today, the tropical depression near the Mariana Islands is initially taking a west-northwest course and is expected to become a typhoon by 3:00 a.m. tomorrow, the 11th. It is then expected to change course to the north-northwest and northwest, approaching Minamidaito Island on the 14th and Okinawa Island on the 15th. The central pressure is expected to be 990hPa at 3am on the 14th and 3am on the 15th, with a maximum wind speed of 23m/s and a maximum instantaneous wind speed of 35m/s. At present, it is not expected to be a storm area, but caution is required for high waves and strong winds accompanied by swells at sea.

There is a great deal of uncertainty about the predicted course at present, but please pay attention to the latest typhoon information that will be distributed in the future.