Snow in northern Japan, sunny eastern and western Japan with a chance of rain showers... Okinawa gradually recovering Tomorrow's weather

2025/01/23 18:35

Tomorrow, Friday the 24th, the weather will be prone to snow in the Sea of Japan side of Tohoku and Hokkaido.
Thick clouds will cover Hokuriku, and some areas will experience rain.

On the other hand, the Pacific side of Tohoku and eastern and western Japan will likely experience widespread sunshine.
However, clouds will likely spread in the afternoon, and there will be sudden rain in areas of Shikoku and southern Kyushu, mainly along the coast of Kanto.
Cold rain and wet snow are likely to fall in northern Kinki and Sanin in the afternoon.
Please be aware of changes in the weather when you return home.

Rain will remain in Okinawa until morning, but it is expected to gradually improve during the day.



Tomorrow, two low pressure systems are expected to move south of Hokkaido and east of Japan.

As a result, snow will likely fall across the whole of Hokkaido, and even areas of eastern Hokkaido, where it usually doesn't snow much, may see snowfall.

In the Pacific Ocean side of eastern and western Japan, which will be affected by a low-pressure trough and sheer line toward night, moist air will likely flow in around the edge of the high pressure system, and rain clouds will gradually increase.

On the other hand, the weather will improve in the Nansei Islands, where the low-pressure trough will gradually become unclear.



The predicted maximum temperatures are 3 C in Sapporo, 9 C in Sendai, 14 C in Tokyo, Nagoya, Osaka, and Hiroshima, 15 C in Fukuoka, 18 C in Kagoshima, and 22 C in Naha, all of which are expected to be around March levels, and the warmth that is hard to believe is mid-winter will continue.

On the 25th (Saturday), the day after tomorrow, the cold air above will move south, so the temperature is expected to drop in many places.

Please be careful not to get sick due to the temperature difference.

Early weather information on high temperatures: Northern Japan will continue to experience high temperatures into February, so be careful of melting snow

2025/01/23 17:25

An early weather report on high temperatures was announced today, Thursday the 23rd.

Early weather reports on high temperatures are issued six days in advance when there is a high possibility of extremely high temperatures that occur only once every 10 years.

From January 29th to around February 6th, temperatures in Hokkaido and Tohoku are expected to be significantly higher than average because they are less susceptible to cold air.

Please be careful of managing agricultural crops and of falling snow, floods, and avalanches due to melting snow in areas with snow.
In addition, if snow falls, it may be wet and heavy, so be careful of fallen trees and snow damage caused by heavy snow on old houses.

[One-month forecast] Winter pressure pattern will not last long...Northern and eastern Japan will continue to see high temperatures into February

2025/01/23 14:50

"Today, the 23rd (Thursday), the Japan Meteorological Agency announced its weather forecast "One Month Forecast" for January 25th to February 24th.

Northern to eastern Japan is less susceptible to cold air, so the high temperature trend is expected to continue into February.
Temperatures will be quite high in northern Japan, especially in the first half of the period.
On the other hand, Okinawa and Amami will be susceptible to cold air during certain periods, and temperatures are expected to be normal or lower.

Northern Japan will be susceptible to low pressure during certain periods, so precipitation will be normal or higher on the Sea of Japan side and higher on the Pacific side.
On the other hand, Okinawa and Amami are less susceptible to low pressure and low pressure troughs, so precipitation is expected to be normal or lower.

Snow in areas on the Sea of Japan side is expected to be less than normal, especially in eastern Japan, as the winter pressure pattern will not last long.

The hours of sunshine will be normal or lower on the Pacific side of northern Japan.

*Weather over the next month

In northern Japan, the Japan Sea side will have many cloudy and snowy days as usual, while the Pacific side will have fewer sunny days than usual.
In eastern and western Japan, the Japan Sea side will have many cloudy, snowy or rainy days as usual, while the Pacific side will have more sunny days as usual.
In Okinawa and Amami, the Japan Sea side will have many cloudy and rainy days as usual.



*1/25~1/31
In northern Japan, the Japan Sea side will have many cloudy and snowy days as usual.
In eastern and western Japan, the Japan Sea side will have many cloudy, snowy or rainy days as usual.
In northern and western Japan, the Japan Sea side will have many cloudy, snowy or rainy days as usual.
In northern and western Japan, the Pacific side will have fewer sunny days than usual because it is easily affected by low pressure.
In Okinawa and Amami, there will be many cloudy and rainy days, as in normal years.

*2/1~2/7
On the Sea of Japan side of northern Japan, there will be many cloudy and snowy days, as in normal years.
On the Sea of Japan side of eastern Japan, there will be fewer cloudy, snowy or rainy days than normal, as the winter pressure pattern will not continue.
On the Sea of Japan side of western Japan, there will be many cloudy, snowy or rainy days, as in normal years.
On the Pacific side of northern, eastern and western Japan, there will be many sunny days, as in normal years.
In Okinawa and Amami, there will be many cloudy and rainy days, as in normal years.

*2/8~2/21
On the Sea of Japan side of northern Japan, there will be many cloudy and snowy days, as in normal years.
On the Sea of Japan side of eastern and western Japan, there will be many cloudy, snowy or rainy days, as in normal years.
On the Pacific side of northern to eastern Japan, there will be many sunny days, as in normal years.
The Pacific coast of western Japan is less susceptible to low pressure and low pressure troughs, so there will be more sunny days than average.
In Okinawa and Amami, there will be more cloudy and rainy days than average."

Kuroshio Extension: Sea surface temperatures 6 C higher than average off the coast of Sanriku [Marine Summary, January 12-18, 2025]

2025/01/23 14:05

The Kuroshio Current flows along the southern coast of Japan and flows eastward from the coast of the Boso Peninsula.
This current east of the Boso Peninsula is called the Kuroshio Extension, and
The Kuroshio Current moving north to the coast of Sanriku has caused sea surface temperatures to be significantly higher than average.

[Marine Summary 2025 January 12-18]



On the 12th, it moved slowly eastward in the western Sea of Japan.
Areas with wave heights of 2m or more spread in the western Sea of Japan.

On the 13th, a low pressure system accompanied by a front developed and moved eastward over the sea east of Japan.
Waves increased widely in the Pacific Ocean.

On the 14th, the intervals between isobars narrowed in the Sea of Japan, and waves in the central to western seas exceeded 2m.

On the 15th, a winter-type atmospheric pressure pattern was established, and waves rose over a wide area of the sea, including the Sea of Japan, the East China Sea, and the sea east of Japan, including the Izu Islands.

A new low pressure system formed in the Sea of Japan on the 16th.
It moved toward northern Japan by the 17th.
Waves rose widely from the west of Hokkaido to off the coast of San'in, and on the 18th, high pressure covered the area and the waves calmed.



On the 12th, the sea surface temperature in the Sea of Japan was higher on the continental side of the central and western seas, and was up to 3 C higher than average.

Some areas in the East China Sea to the Nansei Islands were at or slightly below normal.

On the Pacific side, temperatures were slightly lower than normal from around Cape Ashizuri to offshore Shionomisaki, where the Kuroshio Current leaves the coast.

The Kuroshio Extension continued to move north to the coast of Sanriku.
Sea surface temperatures off the coast of Sanriku were significantly higher than normal, up to 6 C higher.
Offshore southeast of Hokkaido also continued to be significantly higher than normal, up to 5 C higher.



#1-month forecast of ocean currents
The Kuroshio Current will continue to flow close to the east coast of Kyushu.
It will continue to flow close to the shore at Cape Ashizuri, but will come close to the shore for a while.
At Cape Muroto and Cape Shionomisaki, the current continues to flow away from shore. Off the coast of Tokai,
it flows southeast off Cape Shionomisaki, with its southernmost point at around 29.5 N, 136.5 E.
Around the Izu Islands, it flows between Miyakejima and Hachijojima.
At the Boso Peninsula, it continues to flow close to shore.
The southern limit of the Oyashio Current has retreated to 148 E,
The area of the Oyashio Current is significantly smaller than normal.
The power of the Tsushima Warm Current is significantly stronger than normal.

[Cold vortex] Northern Japan and Hokuriku: Beware of sudden heavy rain and snow accompanied by thunder

2025/01/23 13:00

A low pressure system (cold vortex) with cold air in the upper atmosphere is expected to pass through northern Japan between today, the 23rd (Thursday) and the 25th (Saturday).



Since cold vortexes are separated from large currents called the westerly winds,
the strong cold air in the upper atmosphere also spins around in similar places and is left behind.

For this reason, once a cold vortex arrives,
the unstable state of the atmosphere continues for a while,
and it takes time for it to resolve.



In northern Japan and Hokuriku, the weather will be changeable over the weekend, with sudden thunder and rain or snow, or periods of calm and occasional sunny spells.

The weather will be unstable over the weekend, so please be careful of sudden heavy rain or snow accompanied by thunder.

In addition, lightning, gusts of wind, hail and sleet are possible, so please be careful.




On Sunday the 26th, the cold air above will clear,
and the weather in northern Japan will gradually improve.


At the start of next week, a low pressure system and a front will pass,
brrain is expected to fall widely from western to eastern Japan, and wet snow is expected to fall in northern Japan.

After this rain, cold air will flow in from the west,
and some areas are expected to see a return of the usual cold weather for this time of year next week.

The temperature difference will become greater over the next week,
so please take care not to get sick.

A sudden change from spring weather... The start of the week will be midwinter cold and the weather will start to deteriorate from the west. Weekly weather forecast

2025/01/23 12:25

In a complete reversal of the unseasonably warm weather, cold air will move south from the weekend, so the cold of midwinter is likely to return at the start of next week.

At around 9am on Saturday the 25th, cold air below -24 C, which is an indicator of snow if there is precipitation, is expected to move south to Chugoku and Shikoku, and cold air below -30 C, which is an indicator of snowfall on the plains, is expected to move south to Northern Japan and Hokuriku.



At this time, the pressure distribution around Japan will be high in the west and low in the east.

On Sunday the 26th, the country will be covered by a high pressure system extending south, but from Monday the 27th to Tuesday the 28th, the country is expected to be affected by multiple low pressure systems moving around Japan.

Around Wednesday the 29th, the atmospheric pressure will temporarily become winter-like, with cold air moving westward and southward.

After that, around Thursday the 30th, the atmospheric pressure is expected to shift to a high pressure system in the south and low pressure system in the north.




On Saturday the 25th, it is likely to snow in northern Japan and Hokuriku due to the influence of cold air moving south.
However, ground temperatures are expected to be high, so the snow will be wet.
Please be careful of snowfall as road conditions may worsen due to freezing, etc.

Between Monday, the 27th and Tuesday, the 28th, rain is expected to spread from the west due to the influence of a low pressure system moving south of Honshu and a low pressure system moving northeast across the Sea of Japan from the continent.

Rain will fall mainly in Western Japan on Monday, the 27th, and in Eastern Japan and southern Tohoku on Tuesday, the 28th, and snow will fall again in northern Tohoku and Hokkaido.
As the intervals between isobars narrow, not only rain but also winds may intensify. Beware of rough weather at the beginning of the week.

In Fukuoka, where temperatures will remain at March levels until around Friday, the 24th, the maximum temperature is expected to fall below 10 C from Monday, the 27th to Wednesday, the 29th.

The beginning of the week will be mid-winter cold, especially in Western Japan, where unseasonably warm weather continues.
Please take care of your health and choose appropriate clothing.

Rain and snow will hit most of the country in the first half of next week, followed by a cold front moving south in a westward direction

2025/01/23 07:19

In the first half of next week, from the 27th (Mon) to the 28th (Tue), a low pressure system will pass near Honshu and move toward the Sanriku coast.





On the 27th (Mon), the rain will spread from Western Japan to Tokai, and on the 28th (Tue), the rain and snow will be concentrated in Northern and Eastern Japan. As the cold air retreats northward, the weather in Hokuriku will be dominated by rain, and some areas in the plains of Northern Japan are expected to see rain instead of snow. In areas where a lot of snow remains, the melting will accelerate, and in urban areas, snow will fall from roofs and road conditions will worsen, and in mountain areas, avalanches will be a concern.



After the low pressure system passes, cold air is expected to move south in a westward direction. According to the forecast for cold air at an altitude of around 1,500m at 9:00 a.m. on the 28th (Tue), western Japan is expected to be covered by cold air of -6 C or less. The maximum temperature on the 28th (Tue) will be 7 C in Fukuoka and 8 C in Hiroshima, and the cold of winter will suddenly return. The warm weather of early spring continues, so you need to be careful of temperature differences next week.

Tomorrow, Thursday 23rd, low pressure in the Sea of ??Japan, spreading snow and rain

2025/01/22 21:19

Tomorrow, the 23rd (Thursday), a low pressure system will move eastward across the Sea of Japan. Tomorrow afternoon, rain and snow will intensify on the Sea of Japan side of Tohoku and Hokuriku, possibly accompanied by thunder. Snow and rain are also possible on the Pacific side of Hokkaido and Tohoku, so it is a good idea to bring a folding umbrella when going out.



On the other hand, many areas west of Kanto, which will be covered by high pressure, will be sunny, and it will be warm during the day, with maximum temperatures in Kyushu and other areas reaching over 15 C.



Warm conditions are expected to continue through Friday the 24th. The weather will be as warm as March across the country, with temperatures in eastern and western Japan reaching around 15 C. Temperatures will also be high in northern Japan for this time of year, so be careful of avalanches caused by melting snow and snow falling from roofs.

Tomorrow, Thursday 23rd, low pressure in the Sea of ??Japan, spreading snow and rain

2025/01/22 21:19

Tomorrow, the 23rd (Thursday), a low pressure system will move eastward across the Sea of Japan. Tomorrow afternoon, rain and snow will intensify on the Sea of Japan side of Tohoku and Hokuriku, possibly accompanied by thunder. Snow and rain are also possible on the Pacific side of Hokkaido and Tohoku, so it is a good idea to bring a folding umbrella when going out.



On the other hand, many areas west of Kanto, which will be covered by high pressure, will be sunny, and it will be warm during the day, with maximum temperatures in Kyushu and other areas reaching over 15 C.



Warm conditions are expected to continue through Friday the 24th. The weather will be as warm as March across the country, with temperatures in eastern and western Japan reaching around 15 C. Temperatures will also be high in northern Japan for this time of year, so be careful of avalanches caused by melting snow and snow falling from roofs.

[Pollen dispersion] Weather is expected to be similar to March from now on, so we need to take measures against pollen. What days will have the most pollen in the air

2025/01/22 16:59

Recently, Tokyo announced that cedar pollen began to fly on January 8th (Wednesday).
This is the earliest pollen dispersion since the survey began in 1985.
The Tokyo Metropolitan Government has decided to investigate this in detail, as it is believed that the high temperatures last summer caused the male flowers of cedar trees to grow larger than usual.
Towards the end of this month, temperatures are expected to rise above average, increasing the amount of pollen dispersed.

#Until cedar pollen disperses
In early summer, male flowers, which are the source of pollen, appear at the tips of cedar twigs.
Then, pollen is completed around October to November,
Pollen dispersion begins around February to March when temperatures rise.



#This month will be as warm as March. Will the amount of pollen released increase
In normal years, cedar pollen starts to release in earnest from mid- to late February in Kyushu to Kanto.
However, this year, the weather is expected to be similar to that of mid-February to early March until the end of January, and as the temperature rises, the amount of pollen released will increase slightly.
As we approach the start of full-scale pollen release, the amount of pollen released per day is expected to increase, so please take preventive measures against hay fever early.



#Take early precautions against pollenWhat are the days when pollen is most likely to fly
Pollen counts tend to be high on windy, sunny, dry days, days with high maximum temperatures, and sunny days the day after rain.
Checking the weekly weather forecast, rain is expected in central Tokyo on the 28th (Tuesday), and it is expected to be sunny the following day, the 29th (Wednesday). Temperatures are also expected to be higher than average.



Please check pollen and weather information frequently, and take precautions such as wearing a mask and glasses when going out on days with high pollen counts.
In addition, it is a good idea to dry laundry indoors as much as possible to prevent pollen from entering the room. When cleaning, wiping with a damp rag is also effective.
Since pollen began to spread early this year, it is a good idea to visit a hospital early and take precautions in advance.