Okinawa: unstable until tomorrow 13th (Monday); watch out for severe thunderstorms

2024/05/12 05:39

The Okinawa region is expected to experience extremely unstable atmospheric conditions through tomorrow, the 13th (Monday) due to the front and moist air flowing into it.

In the main island of Okinawa and the Sakishima Islands, heavy rain is expected to fall at a rate of 40mm per hour in many places until tomorrow, the 13th (Monday). Please be careful of landslides, flooding of low-lying areas, and rising river waters. Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level.



#Forecast rainfall

Forecast rainfall for 24 hours until 6:00 am on the 13th (Monday) tomorrow (in areas with the most)
Okinawa main island region 80mm
Sakishima Islands 100mm
Then, until 6:00pm on the 14th (Tuesday) the day after that 24-hour forecast rainfall (in heavy areas)
Okinawa Main Island region 50-100mm
Sakishima Islands 50-100mm

Cumulonimbus clouds will be expected in Okinawa Mainland region and Sakishima Islands through tomorrow 13th (Monday) There is a risk that the storm will develop and cause damage from lightning strikes, tornadoes, and other violent gusts. Please be careful during outdoor activities. In addition, if there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving to a sturdy building. In the Daitojima region, please be careful of lightning strikes, gusts of wind, and sudden heavy rain under developed cumulonimbus clouds tomorrow, the 13th (Monday).

Weekly weather - After stormy weather, it's sweaty and sunny - Okinawa's rainy season is still a long way off

2024/05/12 03:50

From today, the 12th (Sunday) to tomorrow the 13th (Monday), a low pressure system will move from Primorye to the Sea of Okhotsk, and a cold front extending from the low pressure system will pass near Japan. Another front is expected to extend from the East China Sea to the Pacific side of Honshu.



Today the 12th On Sunday (Sunday), it will rain mainly in western Japan, with localized areas such as Shikoku and southern Kyushu experiencing extremely heavy rain of over 50mm per hour. Tomorrow, the 13th (Monday), the area of heavy rain will shift to northern and eastern Japan. Rainfall will increase mainly in the Pacific side of eastern Japan, such as the Tokai and Kanto-Koshin regions, with heavy rains of up to 300mm possible in some places. We need to be on guard against landslides, flooding of low-lying land, and rising and flooding rivers.

After that, it is expected that we will be covered by high pressure for a while, and the weather will continue to be sunny. From the Kanto region to the west, there are many places where summer days are over 25 degrees Celsius, making it hot and sweaty during the day. The cold in the mornings and evenings will also be weaker than in the past, with the lowest temperature likely to be around 15c.



Rainy season in Okinawa A normal day is around May 10th, but we can expect many sunny days from now on. The rainy season in Okinawa is coming later than normal, and it looks like it's still a long way off.

13th (Monday) Beware of heavy rain in the Kanto-Koshin region

2024/05/12 00:09

A front is expected to form in the East China Sea on the night of the 11th (Saturday) and extend into eastern Japan through the 13th (Monday). As warm, humid air flows toward the front, atmospheric conditions will become unstable in the Kanto-Koshin region on the 13th (Monday), leading to the risk of heavy rain.

#Disaster Prevention Matters
In the Kanto-Koshin region, please be careful of landslides, flooding of low-lying areas, and rising river waters on the 13th (Monday). If the rain clouds develop more than expected, there is a possibility of warning-level heavy rain.



#Rain Forecast
The predicted 24-hour precipitation from 18:00 on the 12th (Sunday) to 18:00 on the 13th (Monday) is high in all places.

Northern Kanto region 100-150mm
Southern Kanto region 100 ~200mm
Koshin region 100-200mm
Izu Islands 100-150mm

The rainfall is expected to increase from then until the 14th (Tuesday). Please check the latest weather information.

12th (Sunday) - 13th (Monday) Beware of heavy rain in the Kanto-Koshin region

2024/05/11 23:35

A front is expected to form in the East China Sea on the night of the 11th (Saturday) and extend into eastern Japan through the 13th (Monday). As warm, humid air flows toward the front, atmospheric conditions will become unstable in the Kanto-Koshin region on the 13th (Monday), leading to the risk of heavy rain.

#Disaster Prevention Matters
In the Kanto-Koshin region, please be careful of landslides, flooding of low-lying areas, and rising river waters on the 13th (Monday). If the rain clouds develop more than expected, there is a possibility of warning-level heavy rain.



#Rain Forecast
The predicted 24-hour precipitation from 18:00 on the 12th (Sunday) to 18:00 on the 13th (Monday) is high in all places.

Northern Kanto region 100-150mm
Southern Kanto region 100 ~200mm
Koshin region 100-200mm
Izu Islands 100-150mm

The rainfall is expected to increase from then until the 14th (Tuesday). Please check the latest weather information.

12th (Sunday) - 13th (Monday): Heavy rain across the country; warning-level heavy rain expected in wide areas

2024/05/11 19:05

From tomorrow the 12th (Sunday) to the 13th (Monday), a low pressure system will move from Primorye to the Sea of Okhotsk, and a cold front extending from the low pressure system will pass near Japan. Another front is expected to extend over the Pacific side of western Japan until the 12th (Sunday), and over the Pacific side of eastern Japan until the 13th (Monday).



These fronts Warm, humid air will flow into the area, causing unstable atmospheric conditions over a wide area from western to northern Japan.



#Forecast rainfall

Northern and eastern Japan will experience extremely heavy rain accompanied by thunder from the 12th (Sunday) to the 13th (Monday), with some places experiencing heavy rain.

Forecast rainfall for 24 hours until 18:00 on the 13th (Monday) the next day (in heavy places)
Tokai region 200-300mm
Kanto-Koshin region 100-200mm
Tohoku region, Izu Islands 100-1 50 mm
Hokuriku region 50-100 mm


Please be careful of landslides, flooding of low-lying land, and rising and flooding rivers. Even in western Japan, if rain clouds develop or stagnate more than expected, rainfall may increase and heavy rain warnings may be issued.

Midsummer day due to Foehn phenomenon, fear of very heavy rain from Sunday to early next week

2024/05/11 14:56

Today, the 11th (Saturday), a high pressure system centered over the sea east of Japan is moving eastward.
Warm air has flowed into the Japanese archipelago from the south around the edge of a high-pressure system, causing temperatures to rise from yesterday.
As of 14:00, the daily maximum temperature was 30.8c in Kaga Nakatsuhara, 30.7c in Kanazawa, and 30.4c in Komatsu in Ishikawa Prefecture, making it a midsummer day mainly on the Sea of Japan side due to the influence of the Foehn phenomenon. There was a place.

From tomorrow the 12th (Sunday) to the 13th (Monday), the weather will be downhill from the west.
Although the heat will gradually ease, the low pressure system and front will advance towards the Japanese archipelago, and warning-level heavy rain will occur mainly in western Japan tomorrow, the 12th (Sunday), and in eastern and northern Japan the following day, the 13th (Monday). There is a fear.

Tomorrow, the 12th (Sunday), a front will extend from southern China, through the East China Sea and Kyushu, to the south of Shikoku. Additionally, a low pressure system accompanied by a front is expected to approach the Hokkaido area.



Okinawa gradually Clouds will increase and there will be areas of rain and thunderstorms overnight.
It will start raining in Kyushu in the morning, and in Chugoku and Shikoku before noon, and it is expected to rain heavily in the afternoon with localized thunderstorms.
Especially in southern Kyushu and the Pacific coast of Shikoku, which are susceptible to the effects of warm, humid air, there may be places where extremely heavy rain falls, like waterfalls.
Please be careful of landslides, flooding of low-lying areas, and rising and flooding of rivers.



Raining The area will gradually expand, and rain will start in the evening in the Kinki region and early in the evening in some places in the Tokai region.
Even in the Kanto-Koshin, Hokuriku, and Tohoku regions, where the sun shines during the day, rain is expected to begin in the evening.
Hokkaido will be covered in clouds, and there will be places on the Sea of Japan side where it will start to rain in the afternoon.

The day after tomorrow, the 13th (Monday), the center of the rain will shift to eastern and northern Japan.
When the cold front passes, very heavy rain is expected in localized areas.



Rain clouds expected If it becomes more developed or becomes stagnant, there is a risk of warning-level heavy rain in the Tokai region, eastern Japan, and the Pacific coast of Tohoku.
The wind is also expected to increase, which may affect transportation.
Please pay attention to the latest weather and traffic information.

Today's weather: Sunny and rising temperatures nationwide; watch out for showers in Shikoku

2024/05/11 08:15

Today, the 11th (Saturday), the area around Japan is expected to be covered by a
high pressure system, and it will be sunny across the country.

Temperatures are rising across the country, and many places in Honshu to Kyushu will experience summer days with maximum temperatures of 25c or higher.

Yamagata, Fukushima, Matsue, and Ishigaki Island are expected to reach 30c,
Nagano is expected to reach 31c, making it a midsummer day.

It will be a perfect day for a holiday, but please take precautions against the heat and UV rays before heading out.

Also, there will be some scattered showers in Shikoku from the evening.

Please pay attention to changes in the sky.



From tonight until tomorrow the 12th (Sunday), the high pressure system will move away to the sea east of Japan. It is expected to approach nearby.

These fronts and the
isobars between the low and high pressure systems will become crowded, increasing winds and making it easier for warm, humid air to flow in from the south into tomorrow.

As a result, thick clouds will gradually begin to spread over Kyushu and Shikoku from tonight.
The atmospheric conditions will become unstable tomorrow, and rain and thunderstorms are likely.

There will be localized heavy rain in the Pacific side of the Tokai-Kinki region, Chugoku, Shikoku, and Kyushu, and especially in southern Kyushu, there will be some places where it will rain very heavily.

Depending on the development and movement of rain clouds,
warning-level heavy rain may occur until the 13th (Monday).

Please take advantage of today's sunny weather and prepare for the rain.

Prospects for end of "El Nino"; "La Nina" expected from summer to fall

2024/05/11 06:50

The Japan Meteorological Agency released an El Nino monitoring bulletin on Friday, May 10th.

The El Nino phenomenon currently occurring is coming to an end, and it is predicted that conditions will likely return to normal.

After that, it is possible that
normal conditions will continue from summer to autumn, but
the possibility of a La Nina phenomenon will gradually increase.

For the time being, the effects of the
El Nino phenomenon that is currently occurring are expected to remain, but if
a La Nina phenomenon occurs and develops, its effects will gradually be reflected
in the weather around the world and in Japan. It will come.

*When an El Nino phenomenon occurs...(from the Japan Meteorological Agency website)

When an El Nino phenomenon occurs,
the sea surface temperature in the tropical western Pacific decreases, and
the activity of cumulonimbus clouds increases in the tropical western Pacific. It becomes inactive.

For this reason, in the summer around Japan, the overhang of the Pacific high pressure system weakens, resulting in lower temperatures and fewer
sunshine hours.

Also, precipitation tends to increase on the Sea of Japan side of western Japan.

In winter, the atmospheric pressure pattern of high in the west and low in the east weakens,
temperatures tend to rise.

*When a La Nina phenomenon occurs...(From the Japan Meteorological Agency website)

When a La Nina phenomenon occurs,
Sea surface temperature in the tropical western Pacific increases,
Cumulonimbus cloud activity increases in the tropical western Pacific. It will be active.

For this reason, in the summer around Japan, the Pacific high pressure system tends to extend northward, causing
temperatures to rise.

Okinawa/Amami is more susceptible to the influence of moist air currents from the south,
which tends to have more precipitation.

In winter, the atmospheric pressure pattern of high in the west and low in the east is stronger,
temperatures tend to be lower.

Weekly weather: After stormy weather, the weather is getting hotter ahead of the season

2024/05/10 23:30

From the 12th (Sunday) to the 13th (Monday), a low pressure system accompanied by a front is expected to come from the
continent, and a front from the East China Sea is expected to approach and pass near
Japan.

Then from the 14th (Tuesday) to the 17th (Friday),
the area around Japan will be in an area of high pressure.




On the 12th (Sunday), it will begin to rain in northern Kyushu and the Chugoku region.
As the front passes, the area of rain will spread to the Tokai region.

A low pressure system with a front approaches from the continent
The weather is also going downhill on the Sea of Japan side of Hokkaido.

On the 13th (Monday), it will rain in Kanto, Hokuriku, and Tohoku.

When this front or low pressure system passes,
strong southerly winds will bring in warm, humid air, making the atmosphere unstable.

In addition to widespread stormy weather with strong rain and wind,
if rain clouds develop or stagnate more than expected, there is a risk of
warning-level heavy rain.

From Sunday to Monday, people across the country need to be careful of damage caused by heavy rain, including
landslides, flooding of low-lying areas, flooding of roads, and rising river waters.




The rain is likely to continue on the Pacific side of the Kanto and Tohoku regions until the 14th (Tuesday).

Afterwards, the weather will improve from the west
and be sunny across the country over the weekend.

It is expected that there will be many days when the temperature will be high for this time of year.

When going out during the day, please take precautions against the heat and UV rays.

From Sunday to Monday (12th to 13th) Heavy rain is expected in Tokai areas; stormy weather nationwide

2024/05/10 20:30

The front is expected to move east along the southern coast of Honshu from the 12th (Sunday) to the 13th (Monday).

Also, a low-pressure front with a front approaches from the continent,
and the high-pressure system moves away to the eastern seaboard, increasing southerly winds.

As warm, humid air flows in and the atmospheric conditions become unstable, the weather is likely to become stormy with strong rain and wind across the country.



There is a possibility of warning-level heavy rain over a wide area from Kyushu to Tohoku, especially in the Tokai region, which is especially susceptible to the effects of humid air.

Also, in Ehime Prefecture, where there was a large earthquake on the 17th of last month,
even a little rain can cause landslides.

Please be careful of disasters caused by heavy rain, such as landslides, flooding of low-lying areas, flooding of roads,
rising and flooding of rivers, and prepare early
.