Warning of high waves due to swells in Okinawa tomorrow

2025/11/18 15:51

Today, the 18th (Tuesday), a developed low pressure system is moving eastward near the Chishima Islands, and a continental high pressure system is protruding near Japan.
The area around Japan has a winter-like atmospheric pressure pattern of high in the west and low in the east.



Although the peak of snow and wind has passed in Hokkaido, there are places where heavy snow and blizzards are occurring.
As of 3:00 p.m., a wave warning has been issued for the Nemuro and Abashiri regions of Hokkaido.
Please be careful of high waves until dawn on Wednesday the 19th.
A heavy snow warning has been announced for Tsugaru and Sanyachi Kamikita in Aomori Prefecture.
Please be careful of heavy snow until the evening of today, Tuesday the 18th.

Even in the Okinawa region, the gradient of atmospheric pressure is increasing due to the protrusion of the continental high pressure system.
In Tokorino, Yonaguni Town, Okinawa Prefecture, a maximum wind speed of 18.1 m/s was observed at 9:05 a.m., and a maximum instantaneous wind speed of 23.1 m/s was observed at 10:26 a.m.
Also, as of 3 p.m., a wave warning has been issued for the Yaeyama region.



The Yaeyama region is expected to experience heavy swells through tomorrow the 19th (Wednesday).
Please be careful of high waves.
In the Okinawa main island region and Miyakojima region, please be careful of high waves until tomorrow the 19th (Wednesday).
The main island of Okinawa and the Sakishima Islands need to be careful of strong winds until tomorrow the 19th (Wednesday).

#Wave height expected for tomorrow, the 19th (Wednesday)
Okinawa main island region 4m with swells
Daitojima region 3m
Miyakojima region 5m with swells
Yaeyama region 6m with swells

#Forecasted wave height for tomorrow 20th (Thursday)
Okinawa main island region 2.5m
Daitojima region 3m
Miyakojima region 3m
Yaeyama region 3m With swells

# Maximum wind speed (maximum instantaneous wind speed) expected for tomorrow 19th (Wednesday)
Miyakojima region 15m/s (25m/s)
Yaeyama region 17m/s (30m/s)

``Winter Storm'' Northern Japan warns of strong winds, heavy snow, and blizzard. How long will the impact last What's the weather like for the three-day weekend [Weekly weather]

2025/11/18 12:01

In mid-November, cold air comparable to midwinter is flowing in, creating a ``winter storm'' mainly in northern Japan.

The cold air this time will not last too long and will pass by the night of the 19th (Wednesday), but
there will be heavy snow and blizzard on the Sea of Japan side, and cold winds will blow on the Pacific side as well,
making it temporarily cold in December.
Please be careful not to get sick due to the temperature difference.



Let's take a look at the clouds using the Himawari meteorological satellite.

Today, November 18th (Tuesday), the winter-like atmospheric pressure pattern is strengthening,
with strong cold air flowing into the sky.

The sea of Japan is covered with streaks of clouds due to the onset of cold air.
(The stronger the cold air blowout, the shorter the distance from the coast of the
continent to the clouds forming in the Sea of Japan.)

Kesa has observed the first snow in Akita,
along the mountains of Yamagata and Niigata, snow is accumulating, and in some places it is snowing for the first time this season.



Tonight's forecast for rain, snow, and wind.

The wind from the north will be stronger nationwide,
There will be snow and rain in many places in northern Japan and Hokuriku.

In northern Japan, depending on the wind direction, the snow may locally become heavier, leading to
warning-level heavy snowfall.

Be careful and be on guard against traffic disruptions due to heavy snow, poor visibility due to blizzard,
snow falling from roofs, etc.

In addition, rain and thunderstorms are expected in the flatlands from Hokuriku to the San'in region, and
snow is expected in high altitude areas.

There will be a lot of clouds on the Pacific side as well, and it will rain in Kanto and other areas, and there will be some places where it will rain occasionally.
At night, the wind from the north will be strong and it will feel quite cold.

Please stay warm.



#The first half of the holiday will be sunny, but the last day will be rainy in many places#

Even after the 20th (Thursday), low pressure systems and fronts will frequently pass through northern Japan and Hokuriku, so there will be many places with rain and snow.

During the three-day weekend from the 22nd (Sat) to the 24th (Mon), you can expect sunny skies on Labor Thanksgiving Day (Sunday) the 23rd,
which seems like the best time to go out during the holidays.

On the other hand, the Pacific side will be covered in high pressure during the holidays, and many places will be sunny.

It's cold in the mornings and evenings, but
you'll feel the warmth of the sun during the day.

Today, the 18th (Tuesday), it's snowing and raining on the Japan Sea side, and temperatures are dropping nationwide

2025/11/18 08:11

Today, the 18th (Tuesday), the area around Japan has a winter-like atmospheric pressure pattern of high in the west and low in the east, and strong cold air is flowing into the sky above
.



In Hokkaido, the expected amount of snowfall from 6:00 on the 18th to 6:00 on the 19th is expected to be 30 cm
in the northern part of Hokkaido on the Sea of Japan side, and 30 cm
in the southern part of Hokkaido on the Sea of Japan side.
Please be careful of traffic obstructions caused by heavy snow, blowing snow, and snowdrifts.



In addition, snow is expected to fall on the Sea of Japan side of the Tohoku region, and also along the mountains of Tohoku and Hokuriku. Rain predominates in the flatlands of the Hokuriku and San'in regions, but the atmospheric conditions are extremely unstable, so you need to be careful of lightning, tornadoes, and sudden heavy rain.



On the Pacific side of eastern and western Japan, clouds are likely to spread and cold northerly winds are expected to blow
, and temperatures are expected to take a turn from yesterday. Please take measures to protect yourself from the cold.

Tomorrow, the Leonid meteor shower will be at its peak!! The influence of moonlight will be small and the conditions will be favorable. What's the weather like

2025/11/17 12:41

#The Leonid meteor shower is at its peak!! The effect of moonlight is small and favorable conditions
Tomorrow, the 18th (Tuesday) at 3 a.m., the activity of the Leonid meteor shower will be at its maximum.
Observations will be possible from 11:00 pm today, the 17th (Monday) when the radiant will rise, until dawn on the 18th (Tuesday).
The best time to see it is before dawn on the 18th (Tuesday), and the maximum time of the Leonid meteor shower is around 3:00 am.
Around 4 a.m., a thin moon will rise, but the moonlight will have little effect on it, so it will be observable under favorable conditions.
According to the National Astronomical Observatory of Japan, the number of meteors is about 5 per hour.
The radiant will rise in the eastern sky, but meteors will flow not only in the east, but in all directions throughout the sky.



#What's the weather like
Today, the 17th (Monday), a low pressure system is moving eastward over the Sea of Okhotsk, and a cold front is passing through northern Japan and extending into the Sea of Japan.
There are places where it is snowing and raining in Hokkaido and raining in Tohoku.
The area around Honshu is covered with high pressure and the sun is shining.
After this, the high pressure system is expected to gradually move away from Japan.
The low pressure system corresponds to a cold vortex in the upper atmosphere and will rapidly develop as it moves through the Sea of Okhotsk, and the front will pass over northern and western Japan into tonight.
A winter-like atmospheric pressure pattern is expected to occur, with high in the west and low in the east, mainly in northern and eastern Japan until tomorrow, the 18th (Tuesday).



In the early morning hours of the 18th (Tuesday), the best time to see the meteor shower, there will be more snow on the Sea of Japan side of Hokkaido, but the Pacific side will be clear for observation.
Tohoku and Hokuriku will be covered in clouds, snow and rain will fall on the Sea of Japan side of Tohoku, and rain and snow will fall on Hokuriku, making observation difficult.
It is expected that there will be a lot of clouds in Kanto-Koshin and Tokai areas, but in the inland areas, the clouds will clear and there will be good opportunities for observation.
There are many clouds in the Kinki and Chugoku areas, and it will rain on the Sea of Japan side, making observation difficult.
Shikoku will also be covered in clouds, but in some areas you may be able to see through the gaps in the clouds.
The chances of observation are high in Kyushu, but rain clouds will spread over the Nansei Islands, making the sky conditions unlucky for observation.

Today, the 17th (Monday), a rapidly developing low pressure system will lead to a winter-like atmospheric pressure pattern through tonight, with extremely stormy weather in Hokkaido.

2025/11/17 07:22

Today, the 17th (Monday), a low pressure system accompanied by a front is passing near Sakhalin. A cold front extending from the front is moving south across the Sea of Japan.



The low pressure system is expected to rapidly develop as it moves towards the Sea of Okhotsk, and the front will pass near Honshu tonight. After the front passes, the area around Honshu will have a winter-like atmospheric pressure pattern of high in the west and low in the east, strong cold air in the upper atmosphere will move southward, the spacing between isobars will narrow, and cold winds will blow from the north.



In Hokkaido, developed rain clouds associated with a cold front are approaching, and there will be widespread rain and thunderstorms on the Sea of Japan side in the morning. Please be careful of strong wind gusts such as lightning and tornadoes. In the afternoon, the rain will turn to snow in Hokkaido, and the wind will become stronger, causing a blizzard in some places. Please be careful of the increasing snowfall and be wary of strong winds at night.

The front will pass through Honshu in the afternoon, bringing rain and thunderstorms to Tohoku, Hokuriku, and the Sanin area. There will be localized thunderstorms, and depending on the degree of development of the rain clouds, it is likely that violent gusts such as tornadoes may occur, as well as hail and hail. There will be places where it snows at night along the high mountains from Tohoku to the San'in region.

The Pacific side of eastern and western Japan is expected to be sunny in many places, and daytime temperatures will be around 20c. However, the night is expected to be colder in some places than in the morning due to the influence of cold winds from the north. Take measures to protect yourself from the cold so you don't lose your health.

From the 17th (Monday) tomorrow, northern Japan will experience severe storms. From the 18th tomorrow, there will also be snowfall along the mountains of eastern and western Japan.

2025/11/16 20:52

Tomorrow, the 17th (Monday), a low pressure system accompanied by a front will continue to develop and move from the Sakhalin area toward the Sea of Okhotsk. A cold front extending from the center of the low pressure system moves southward near Honshu, causing the weather to deteriorate from western Japan to eastern Japan on the Japan Sea side. In northern Japan, the isobar lines are closely spaced, and there is a risk that winds from the northwest to west will become stronger, resulting in storms.



In Hokkaido, the rain will gradually turn to snow from the afternoon of the 17th tomorrow, and the wind will become stronger, causing a blizzard in some places. Please be aware of poor visibility and traffic obstruction due to snowstorms.



The next day, the 18th (Tuesday), the area around Honshu will have a winter-like atmospheric pressure pattern of high in the west and low in the east, and strong cold air with temperatures below -6 C at an altitude of approximately 1500 meters is expected to move southward into eastern and western Japan. In northern Japan, very strong cold air is expected to flow in at this time of year, with temperatures below -12 degrees Celsius, which is a guideline for heavy snow even in flat areas. In northern Japan, there is a possibility of heavy snow not only along the mountains but also on the flatlands.



On the Sea of Japan side from the southern Tohoku area to the Sanin area, winds will collide near the pressure trough (red dashed line in the diagram) that forms in the Sea of Japan, and rain clouds will develop, resulting in rain and thunderstorms. Depending on the degree of development of the rain clouds, lightning strikes, strong wind gusts such as tornadoes, and hail may occur, so please be careful.
Along the mountains, there will be snow due to the strong cold air above, and there will be snowfall in some places. It will be snowing in the flatlands of Tohoku and Nagano Prefectures, and in the high altitudes of the Chugoku Mountains, and it will likely be the first snow in some places.



It looks like there will be places along the mountains from Tohoku to western Japan that will experience the first snowfall of the season. When driving on mountain passes, be sure to wear winter tires and drive safely.

Northern Japan to be careful of rough weather

2025/11/16 18:07

The area around Honshu is covered by a high pressure system moving eastward, but in Primorye there is a low pressure system with a front that is moving northwest.
The low pressure system is rapidly developing as it passes north of Hokkaido, and tomorrow, the 17th (Monday), it will advance to the Sea of Okhotsk, and the front will pass through Honshu.
We will see a winter-like atmospheric pressure pattern of high in the west and low in the east, with strong cold air moving south, creating a large gradient in atmospheric pressure and making the atmosphere extremely unstable.

In Hokkaido and Tohoku, please be careful of strong winds, especially on the Sea of Japan side.
If the atmospheric pressure gradient becomes larger than expected, there is a possibility of warning-level winds.

Also, cumulonimbus clouds are expected to develop and there are some places where thunderstorms will occur.
Please be careful of flooding of low-lying areas due to heavy rain, landslides, rising river waters, strong gusts of wind caused by tornadoes, lightning strikes, and hail.

In Hokkaido and along the high mountains of Tohoku, rain is expected to gradually change to snow.



###Wind forecast
Maximum wind speed (maximum instantaneous wind speed) expected on the 17th
Hokkaido Northern land on the Sea of Japan side 20 meters (35 meters).
Hokkaido Northern Sea of Japan Sea side 23 meters (35 meters).
Hokkaido Southern land on the Japan Sea side 18 meters (30 meters).
Hokkaido Southern Sea of Japan Sea side 20 meters (30 meters).
Hokkaido Pacific Ocean side land area 18 meters (30 meters).
Hokkaido, Pacific Ocean, Western Sea, 20 meters (30 meters).
Hokkaido Pacific Ocean side eastern land 18 meters (30 meters).
Hokkaido Pacific Ocean Eastern Sea 20 meters (30 meters).
Hokkaido Northern land on the Sea of Okhotsk side 15 meters (30 meters).
Hokkaido, Northern Sea of Okhotsk side, 18 meters (30 meters).
Hokkaido Southern land on the Sea of Okhotsk side, 18 meters (30 meters).
Hokkaido Sea of Okhotsk side, southern sea, 20 meters (30 meters).
Tohoku Sea of Japan side 18 meters (30 meters).
Tohoku Sea of Japan side land 15 meters (30 meters).





###Rain forecast
On the 17th, rain is expected to gradually turn to snow in Hokkaido and along the high altitude mountains of Tohoku.

The predicted hourly precipitation on the 17th is 30 mm in the northern part of Hokkaido on the Sea of Japan coast.
Hokkaido Southern Sea of Japan side 30mm.
Hokkaido Northern Sea of Okhotsk side 30mm.

The predicted precipitation for the 24-hour period from 18:00 on the 16th to 18:00 on the 17th is expected to be 80 mm in the northern part of Hokkaido's Sea of Japan coast.
Hokkaido Southern Sea of Japan side 50mm.
Hokkaido Northern Sea of Okhotsk side 80mm.

###Disaster Prevention Matters
The Hokkaido region is expected to experience extremely stormy weather on the 17th, with extremely strong winds and localized heavy rain accompanied by thunder.
In the northern part of the Japan Sea side, please be on guard for strong winds from early morning until dawn on the 17th.
In addition, in the Hokkaido region, please be careful of flooding of low-lying areas, landslides, and rising river waters due to strong winds from early on the 17th until late at night, and heavy rain from early on on the 17th to before noon.
Depending on the path and degree of development of the low pressure system, the area and duration of the storm may expand, and there is a risk of warning-level heavy rain.

In addition, in the Hokkaido region, there is a risk of tornadoes, strong gusts of wind, lightning, and hail from early morning until early afternoon on the 17th.
Please be careful when doing outdoor activities and managing crops.
If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving to a sturdy building.

On the Sea of Japan side of Tohoku, from the morning of the 17th until noon, please be careful of traffic disruptions and damage to buildings caused by strong winds from the west.
Also, in the Tohoku region, please be careful of strong gusts such as tornadoes, lightning, hail, and sudden heavy rain from dawn to dusk on the 17th.
If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving to a sturdy building.

Strong cold air will move south at the beginning of the week, with the possibility of snowfall even along Mt. Honshu

2025/11/16 07:00

Today, the 16th (Sunday), the weather will be mild and sunny with sunshine reaching many places, but by the end of the week, tomorrow, the 17th (Monday), a rapidly developing low pressure system is expected to move from the northern Sea of Japan to the Sea of Okhotsk. Therefore, around the 19th (Wednesday), the area around Japan will shift to a strong winter-type atmospheric pressure pattern, and strong cold air will flow into the upper atmosphere.




Looking at the forecast for the cold air around 1,500m above the sky on the 18th (Tuesday), it is predicted that -6c cold air, which is the standard for snow in flat areas, will move south from Hokuriku to the southern part of Tohoku. Snow will fall in Tohoku and along the mountains of eastern and western Japan, and there will be places where it will snow. If you are planning to drive on mountain passes, please make preparations such as changing to winter tires on a calm day.

Also, Hokkaido is expected to experience a strong cold air of -12c for this time of year. There is a risk of increased snowfall not only along the mountains but also on the flatlands. The weather will be stormy with strong winds and blizzards in places. Please pay attention to the latest weather and traffic information as transportation may be affected in the first half of next week.

Today's weather on the 16th (Sunday): It's a good day for tourists in many places. In Hokkaido, it's raining from night onwards.

2025/11/16 06:14

Today, the 16th (Sunday), the area around Japan will continue to be covered in high pressure. It looks like it will be a good day for tourists as the sun shines in many places.



Hokkaido will receive sunlight mainly in the morning. However, due to the influence of a low pressure system and front approaching from the west, clouds will gradually spread in the afternoon, and there will be some places on the Sea of Japan side of the area where it will start to rain at night. If you will be returning late, please prepare rain gear.

On the other hand, the sun will reach a wide area from Tohoku to Kyushu and Okinawa and it will be mild and sunny. It's a good day to go out in various places, so it might be a good time to go see the autumn leaves. During the day, you can feel the warmth of the sunlight in many places, making the weather pleasant and sunny, but the mornings and evenings get colder, resulting in a larger difference in temperature throughout the day. It would be a good idea to go out in clothes that are easy to adjust.

Will the JPCZ (Japan Sea Polar Air Mass Convergence Zone) occur for the first time this season Snow will increase in northern Japan at the beginning of the week, and snow will also accumulate in the mountains of eastern and western Japan [Weekly Weather]

2025/11/15 12:01

This Saturday and Sunday will be sunny and warm and cheerful in many places during the day, but from the beginning of next week, strong cold air will move in and the cold of winter will arrive.

Especially from around the 17th (Monday) to the 19th (Wednesday), there will be heavy snowfall in northern Japan, and there will likely be some places in the mountains of eastern and western Japan as well.

Please take advantage of this mild weekend weather and prepare for snow by changing to winter tires if you are driving over the
mountain pass,
or checking the operation of your snowplow in areas where heavy snowfall is expected.




This Saturday and Sunday will be covered in high pressure and will be sunny in many places.
During the day, temperatures will rise to around 20 degrees Celsius in eastern and western Japan, and
the sun will feel warm.

However, the front will approach from the night of tomorrow, the 16th (Sunday), and
it will begin to rain in some places in Hokkaido.



#It's the first snow rush in Tohoku, with snow falling in the mountains of eastern and western Japan#

Looking at the forecast weather map and cold air forecast for the 17th (Monday) to the 19th (Wednesday),
A strong winter-type pressure pattern will occur on the 17th (Monday),
strong cold air that will bring snow on the flatlands will flow into northern Japan.

In Tohoku, many places are experiencing their first snowfall, and in Hokuriku and other areas, there may be some places where the rain will be mixed with snow.
The first snowfall may be observed in some places.

On the 18th (Tuesday), cold air will flow into the shadows of the mountains, and there is a possibility that snow will accumulate even in the high mountains of western Japan.

On the 19th (Wednesday), the area will be covered by high pressure moving from the continent, and strong cold air is expected to leave from the west.



#This season's first "JPCZ" forecast also#

Furthermore, looking at the rain and snow forecast for the 18th (Tuesday) to 19th (Wednesday),
a long band of rain clouds stretches over the Sea of Japan. On the morning of the 18th (Tuesday), it will head from the Sea of Japan to the Noto Peninsula and Niigata, but in the evening it is expected to gradually move southward from Wakasa Bay to the northern Kinki area and into the San'in area on the morning of the 19th (Wednesday).

This is called JPCZ (Japan Sea Polar Air Mass Convergence Zone),
a convergence zone created when cold air currents (northern winds) are divided into two by high mountains in the northern part of the Korean Peninsula,
and then merge again over the Sea of Japan.

An active precipitation band will occur near this convergence zone, and
there is a possibility that snowfall will increase along the mountains where this precipitation area falls.

From around the 18th (Tuesday) to the 19th (Wednesday), watch out for the sudden increase in rain and snow in Hokuriku and San'in regions.

In addition, small cyclones and disturbances occur over the JPCZ,
cumulonimbus clouds may develop, causing hail, lightning, and gusts of wind.
You must pay close attention to changes in the weather.



The cold weather of winter will arrive at the beginning of next week, and
winter clothing such as coats and mufflers and gloves will come in handy.

The temperature difference between morning and evening and during the day, as well as the temperature difference from day to day, is quite large, so
Please be careful not to get sick.