Low pressure on the south coast on the 2nd (Sun) - Snow possible in Tokyo

2025/01/29 07:59

Next weekend, on Sunday, February 2nd, a low pressure system will develop and pass along the southern coast of Honshu. Weather is expected to deteriorate over a wide area from western to eastern Japan. In western Japan, rain will start falling from the afternoon of Saturday, the 1st, and snow will fall at higher altitudes.



On Sunday, the area of rain and snow will expand to eastern Japan, including Tokai and Kanto Koshin. As the low pressure system moves along the southern coast and cold air flows inland, snow is expected to fall mainly in inland and mountainous areas of eastern Japan. There will be a lot of snow at high altitudes. At the moment, it is expected that it will start snowing in the Kanto plains. It looks like the snow will change to rain in the afternoon. However, there is still uncertainty about the degree of development of the low pressure system and the forecast for cold air. It seems best to assume that it will snow and accumulate even in the Kanto plains. Please check the latest information from time to time.

Today, Wednesday the 29th, beware of heavy snow in various areas; cold north winds even on the Pacific coast

2025/01/29 06:08

Today, Wednesday the 29th, a low pressure system with cold air is expected to pass near Tohoku and gradually move toward the sea east of Japan. The atmospheric pressure distribution around Japan will transition to a winter type, and snow will fall over a wide area on the Sea of Japan side, with heavy snowfall mainly along the mountains.

The expected 24-hour snowfall by tomorrow morning, Thursday the 30th, is as follows: 70cm in Tokai, 60cm in Hokuriku, 50cm in Tohoku and Kanto Koshin, 40cm in Hokkaido, 35cm in Kinki, 20cm in Chugoku, 15cm in Shikoku, and 10cm in northern Kyushu. There is a risk of snow accumulation even in the plains of western Japan, where there is little snow.



Today, the Pacific coast, including Kanto and Tokai, will experience some sunshine, but it will be cold with a chilly wind. The predicted maximum temperatures are 3 C in Sapporo, 6 C in Akita and Niigata, 12 C in Tokyo, 9 C in Nagoya, 8 C in Osaka, and 7 C in Fukuoka. Many areas across the country will experience single-digit temperatures, and it will be as cold as midwinter, especially in western Japan.

[Shikoku] Heavy snowfall expected even on flat land late tomorrow night. Be careful of snow accumulation and frozen roads.

2025/01/28 18:45

Strong cold air below minus 6 degrees Celsius is expected to flow into the Shikoku region at an altitude of around 1,500m by tomorrow, the 29th (Wednesday), and the winter pressure pattern is expected to strengthen tomorrow, the 29th (Wednesday).

*Snow forecast

Heavy snow will fall in mountainous areas late tomorrow, the 29th (Wednesday), and some areas will also experience heavy snowfall on the plains.
In Ehime Prefecture, if snow clouds develop more than expected or snow continues to fall in the same place, there is a possibility of heavy snowfall that will trigger an alert by the evening of tomorrow, the 29th (Wednesday).

Expected 24-hour snowfall until tomorrow evening (heavy areas)
Plains: 10 cm
Mountains: 40 cm

Expected 24-hour snowfall until the evening the day after tomorrow (heavy areas)
Plains: 1 cm
Mountains: 5 cm

Please be careful of traffic disruptions due to snow accumulation and frozen roads.
Please be careful of fallen trees and broken power lines due to snow accumulation, and avalanches.
Also, please be careful about managing agricultural crops and agricultural facilities such as vinyl greenhouses.
Snow is expected to affect transportation, so please try to allow yourself plenty of time when traveling.

[Hokuriku] Atmospheric conditions are extremely unstable... Watch out for lightning strikes until tomorrow. Watch out for whiteouts tomorrow.

2025/01/28 18:05

In Hokuriku, the atmospheric conditions are very unstable due to the influence of cold air above, so the probability of lightning is high.
Beware of strong gusts of wind such as lightning and tornadoes until tomorrow, the 29th (Wednesday).

In addition, winds accompanied by snow will strengthen tomorrow, the 29th (Wednesday), and if the low pressure develops more than expected, it may become a blizzard of warning level.
If you need to travel by car, be careful of whiteouts caused by blizzards.



From today, the 28th (Tuesday) to tomorrow, the 29th (Wednesday), a low pressure system will move from the Sea of Japan to the east of Japan, and then the day after tomorrow, the 30th (Thursday), the pressure distribution around Japan is expected to be winter-type.
Cold air below minus 33 degrees Celsius will flow into the Hokuriku region at around 5,000 meters above the sea.

In the Hokuriku region, very strong winds are expected to blow at sea tomorrow, the 29th (Wednesday), and the sea is expected to be very rough in some areas.
In addition, the atmospheric conditions will be very unstable, so cumulonimbus clouds will develop locally.
If the low pressure develops more than expected, there is a risk of a blizzard.

*Wave forecast

Wave height expected today
Niigata Prefecture 4m
Toyama Prefecture 2m
Ishikawa Prefecture 5m
Fukui Prefecture 4m

Wave height expected tomorrow
Niigata Prefecture 6m
Toyama Prefecture 2.5m with swell
Ishikawa Prefecture 6m with swell
Fukui Prefecture 5m

Wave height expected the day after tomorrow
Niigata Prefecture 4m
Toyama Prefecture 2.5m with swell
Ishikawa Prefecture 5m with swell
Fukui Prefecture 4m



*Wind forecast

Maximum wind speed expected tomorrow (maximum instantaneous wind speed)
Niigata Prefecture On land 18m/s (30m/s)
Niigata Prefecture At sea 20m/s (30m/s)
Toyama Prefecture On land 12m/s (25m/s)
Toyama Prefecture At sea 18m/s (30m/s)
Ishikawa Prefecture On land 15m/s (30m/s)
Ishikawa Prefecture, offshore 20m/s (30m/s)
Fukui Prefecture, on land 12m/s (25m/s)
Fukui Prefecture, offshore 18m/s (30m/s)

In Hokuriku, be on alert for high waves from late tonight today, the 28th (Tuesday) to the day after tomorrow, the 30th (Thursday), and be careful and alert for strong winds accompanied by snow from the early hours of the morning to before noon tomorrow, the 29th (Wednesday).

Also, be careful of strong gusts of wind such as lightning and tornadoes until tomorrow, the 29th (Wednesday).
If there are signs of a developed cumulonimbus cloud approaching, please take measures to ensure your safety, such as moving inside a building.
There is a risk of hail, so be careful when managing crops, etc.

[Tohoku] Be on alert for blizzard tomorrow and heavy snow from the day after tomorrow

2025/01/28 17:55

A low pressure system will pass through the Tohoku region tomorrow, the 29th (Wednesday), and the atmospheric pressure will gradually become winter-like.
Strong cold air with temperatures below minus 39 C is expected to flow into the Tohoku region at around 5,000m above sea level.

The winter-like atmospheric pressure system will continue until the 30th (Thursday), so the weather on the Sea of Japan side of Tohoku will be very rough, and there will be heavy seas at sea.

Heavy snow is also expected in some areas.
If developed snow clouds continue to hang over the same place or if the temperature remains lower than expected, it may become heavy snow that warrants an alert.

Furthermore, due to the influence of the low pressure system and the cold air above, the atmospheric conditions will be very unstable, especially on the Sea of Japan side of Tohoku.
Cumulonimbus clouds are expected to develop and lightning will occur in some areas.



*Wind forecast

Maximum wind speed expected tomorrow (maximum instantaneous wind speed)
Sea of Japan side, offshore 20m/s (30m/s)
Sea of Japan side, on land 18m/s (30m/s)
Pacific side, offshore 18m/s (30m/s)
Pacific side, on land 13m/s (25m/s)

*Wave forecast

Wave height expected tomorrow
Sea of Japan side 6m



*Snow forecast (heavy areas)

Expected snowfall in 24 hours until tomorrow evening
Sea of Japan side, mountainous areas: 50 cm
Sea of Japan side, flat areas: 30 cm

Expected snowfall in 24 hours until the evening of the day after tomorrow
Sea of Japan side, mountainous areas: 70 cm
Sea of Japan side, flat areas: 50 cm

On the Sea of Japan side of Tohoku, from the morning to the evening of tomorrow, the 29th (Wednesday), be on alert for traffic disruptions and damage to buildings caused by strong winds from the west accompanied by snow, and damage to ships and coastal facilities caused by high waves.

In addition, from the morning of tomorrow, the 29th (Wednesday) to the day after tomorrow, the 30th (Thursday), be on alert for traffic disruptions and damage to buildings and agricultural facilities caused by heavy snow, and snow falling from roofs, and be careful of snow accumulating on power lines and trees, and avalanches.

Beware of strong gusts of wind such as tornadoes, lightning, and hail from late tonight, Tuesday, the 28th, through the evening of Wednesday, the 29th, mainly in areas along the Sea of Japan.
If there are signs of a developed cumulonimbus cloud approaching, please take steps to ensure your safety, such as by moving inside a sturdy building.

Heavy snowfall in Nagano Prefecture and northern Kanto on the 29th and 30th; snow mixed with bitterly cold weather in Tokyo over the weekend

2025/01/28 17:05

Heavy snow will fall in some areas of Nagano Prefecture and northern Kanto from tomorrow, Wednesday the 29th, in the evening through the day after tomorrow, Thursday the 30th.
Beware of traffic disruptions due to snow accumulation and frozen roads, and beware of avalanches.

Around Japan, the atmospheric pressure pattern will gradually change to a winter pattern tomorrow, Wednesday the 29th, and cold air with temperatures below -33 C is expected to flow into eastern Japan at an altitude of about 5,500 meters. The winter atmospheric pressure pattern will continue until the day after tomorrow, Thursday the 30th.



The expected 24-hour snowfall by tomorrow, Wednesday the 29th, is heavy in some areas
Northern Kanto region: 15 cm
Koshin region: 40 cm
Then, the expected 24-hour snowfall by the night of the day after tomorrow, Thursday the 30th, is heavy in some areas
Northern Kanto region: 40 cm
Koshin region: 40 cm
If the cold air above becomes stronger than expected or the snow clouds develop more than expected, there is a risk of heavy snowfall that will trigger a warning.

In Nagano Prefecture and northern Kanto, there will be heavy snow from tomorrow, Wednesday the 29th, in the evening to the day after tomorrow, Thursday the 30th.
Be careful and alert to traffic disruptions due to snow accumulation and frozen roads, and be careful of avalanches.



Over the weekend, from Saturday, February 1st to Sunday, February 2nd, a low pressure system will move from Western Japan to Eastern Japan.
On Sunday, February 2nd, it will be rainy or snowy in the Kanto region, and it will be bitterly cold.
Even in Tokyo, there will be some rain and snow, and the expected maximum temperature in the city center will be 6 C.
Please pay attention to the latest information.

After the low pressure system moves eastward, a winter-type pressure pattern will be formed around Japan from the night of the first day of spring on Monday, the 3rd, and the winter-type pressure pattern is expected to intensify on Tuesday, the 4th.
The strong first day of spring cold wave will hit and will remain for a long time.
Heavy snow will fall mainly on the Sea of Japan side, and snow may intensify in Nagano Prefecture and the mountainous areas of northern Kanto.
Southern Kanto will be sunny, with the impact of the intense cold expected to be minimal.

[The beginning of spring cold wave] Spring will not come if this continues. This week's cold weather will be followed by an even stronger beginning of spring cold wave next week.

2025/01/28 16:29

Although there have been many warm days like spring since last week, it is not expected that spring will continue like this.
Strong cold air will flow in frequently this week and next week.
Next week, February 3rd (Monday) is the beginning of spring according to the calendar, but there is a risk of an even stronger cold wave (the beginning of spring cold wave) hitting us than this week.

Today, the 28th (Tuesday), a low pressure system with strong cold air in the upper atmosphere will move eastward across the Sea of Japan. Tomorrow, the 29th (Wednesday), this low pressure system will pass through Tohoku, and the atmospheric pressure around Japan will be in a winter-type pattern.
Tomorrow, the 29th (Wednesday), cold air with a guideline of snowfall of -24c or less at an altitude of around 5,000m is expected to cover all of western Japan.
In addition, tomorrow, the 29th (Wednesday), an even stronger cold front will flow into northern Japan, with temperatures of -36 C or less at around 5,000m above sea level.

Heavy snow is likely to fall mainly in northern Kyushu and the mountainous areas of Sanin through tomorrow, the 29th (Wednesday). There will also be areas of snow accumulation in southern Kyushu and the plains of Shikoku.
As a low pressure system passes through Hokuriku and Tohoku, heavy snow will fall intermittently tomorrow, the 29th (Wednesday), and the amount of snow may increase rapidly.
After the low pressure system passes, active snow clouds associated with the JPCZ will flow in, causing a rapid increase in snow accumulation.
In addition, there are areas where very strong winds accompanied by snow are blowing over the Sea of Japan side of Hokuriku to Tohoku, and tomorrow, the 29th (Wednesday), there is a risk of rough weather with stormy weather in Hokuriku and very rough weather in Tohoku.





The cold air above is expected to clear on the 31st (Friday).
However, on the 3rd (Monday), the beginning of spring, the atmospheric pressure around Japan will once again be of a winter type, and on the 4th (Tuesday), the winter atmospheric pressure will strengthen, bringing a cold wave of the beginning of spring.
Cold air below -30 C, which is even stronger than this week's cold air, will move south to the southern Kyushu area at an altitude of around 5,000m, and cold air below -36 C, which is a guideline for heavy snowfall, will flow into the Shikoku area.
It is expected that this will be the coldest wave of the winter and will remain for a long time.
There is a possibility that the amount of snowfall will be more than average, mainly on the Sea of Japan side of Sanin and Hokuriku.
There may be large-scale traffic disruptions, such as traffic jams due to increased snowfall and poor visibility caused by heavy snowstorms.
There will be snow accumulation in the plains of southern Kyushu and Shikoku, Gifu Prefecture, Nagano Prefecture, and the mountainous areas of northern Kanto.
In addition, the maximum temperature on the 4th (Tuesday) is expected to be in the single digits in many places, with 5 C in Fukuoka, 8 C in Osaka and Nagoya.
Please be extra vigilant against heavy snow and low temperatures and pay close attention to the latest information.

Long-awaited cold front hits Kyushu and Shikoku, with snow accumulating through tomorrow, while winter storm hits Hokuriku and Tohoku

2025/01/28 13:00

Tomorrow, the 29th (Wednesday), the weather will change from spring-like to cold air for the first time in a while, and the Sea of Japan side is likely to be hit by a cold front.

Today, the 28th (Tue), a low pressure system with strong cold air in the sky is moving eastward across the Sea of Japan. There are areas where it is raining or snowing in Kyushu, and snow or rain in Shikoku, Chugoku, Hokuriku, and northern Japan.
Cold air is flowing in from the west, and in Western Japan, where the cold air has been flowing in early, snow is falling mainly along the mountains and inland areas in southern Kyushu, and snow clouds are flowing in to Shikoku.



Tomorrow, the 29th (Wednesday), this low pressure system will pass through Tohoku, and the atmospheric pressure around Japan will be in a winter pattern.
Tomorrow, the 29th (Wednesday), cold air with a guideline of snowfall of -24c or less at around 5000m above sea level is expected to cover all of Western Japan.
In addition, tomorrow, the 29th (Wednesday), even stronger cold air with a guideline of heavy snowfall of -36c or less at around 5000m above sea level will flow into Northern Japan.



In Kyushu, even on the plains in the south, 1 cm of snowfall is expected in 24 hours, and some places are expected to accumulate snow.
In southern Kyushu, the peak of snow will be tomorrow, the 29th (Wednesday), and heavy snow will fall mainly in mountainous areas from dawn to morning.
Heavy snow is expected to fall in northern Kyushu from tomorrow, Wednesday 29th, in the evening, mainly in mountainous areas, with 10 to 20 cm of snowfall expected in 24 hours in mountainous areas.
In Shikoku, the snow will peak from today, Tuesday 28th, in the evening, and heavy snow is likely to fall in mountainous areas from late tomorrow, Wednesday 29th. The expected 24-hour snowfall is 40 cm in mountainous areas and 10 cm in plains in the 24 hours until noon tomorrow, Wednesday 29th, and 15 cm in mountainous areas and 5 cm in plains in the 24 hours until noon the day after tomorrow, Thursday 30th.
Even in areas that are not used to snow, snow will accumulate in some places, so attention should be paid to the impact of snow accumulation and frozen roads on transportation.
In China, snow will fall on plains from tomorrow, Wednesday 29th, in the evening, and snow accumulation will increase further along the mountains.



As a low pressure system passes through Hokuriku and Tohoku, heavy snow will fall intermittently tomorrow, the 29th (Wednesday), and snow accumulation may increase sharply.
In addition, after the low pressure system passes, northerly and westerly winds will collide with the Sea of Japan, creating an active band of snow clouds associated with the JPCZ.
Heavy snow clouds will flow in intermittently, and on the Sea of Japan side of Tohoku, snowfall of 50 cm is expected along the mountains and 40 cm on the plains in the 24 hours until the morning of the 30th (Thursday).
In addition, there are areas on the Sea of Japan coast from Hokuriku to Tohoku where very strong winds accompanied by snow are blowing, and tomorrow, the 29th (Wednesday), the weather will be rough in Hokuriku and very rough in Tohoku.
Please be on guard against large-scale traffic disruptions, such as sudden snowfall and poor visibility due to heavy snowstorms, resulting in traffic jams.

Cold air flows into western Japan, heavy snowfall expected in Kyushu, especially in mountainous areas

2025/01/28 06:14

Today, the 28th, the winter pressure pattern will intensify, and strong cold air with temperatures below -9 degrees is expected to flow into northern Kyushu at around 1,500 meters above sea level. The strong winter pressure pattern is expected to continue until tomorrow, the 29th, and there is a risk of heavy snowfall in northern Kyushu, especially in mountainous areas.

Please be careful of traffic disruptions due to snow accumulation and frozen roads, visibility problems due to snow, snow accumulation on power lines and trees, and the management of agricultural crops and agricultural facilities.



#Expected amount of snow (heaviest areas)
+Snowfall in the 24 hours until dawn tomorrow, the 29th
Yamaguchi Prefecture mountainous area: 20 cm
Fukuoka Prefecture mountainous area: 10 cm
Saga Prefecture mountainous area: 15 cm
Nagasaki Prefecture mountainous area: 7 cm
Oita Prefecture mountainous area: 7 cm
Kumamoto Prefecture mountainous area: 7 cm
Yamaguchi Prefecture plain: 5 cm
Fukuoka Prefecture plain: 3 cm
Saga Prefecture plain: 2 cm
Nagasaki Prefecture plain: 1 cm
Oita Prefecture plain: 1 cm
Kumamoto Prefecture plains: 1 cm

+Snowfall in the 24 hours until dawn on the 30th
Yamaguchi Prefecture mountainous areas: 10 cm
Fukuoka Prefecture mountainous areas: 5 cm
Saga Prefecture mountainous areas: 5 cm
Nagasaki Prefecture mountainous areas: 5 cm
Oita Prefecture mountainous areas: 5 cm
Kumamoto Prefecture mountainous areas: 5 cm
Yamaguchi Prefecture plains: 3 cm
Fukuoka Prefecture plains: 1 cm
Saga Prefecture plains: 1 cm
Nagasaki Prefecture plains: 1 cm
Oita Prefecture plains: 1 cm
Kumamoto Prefecture plains: 1 cm

Weather for today, Tuesday 28th: ??Beware of increased snowfall in mountainous areas of western Japan, while the Pacific coast receives more sunshine

2025/01/28 05:53

Today, the 28th (Tuesday), the atmospheric pressure pattern will gradually become winter-like, and strong cold air from above is expected to flow in from the west. There is also a low pressure system over the Sea of Japan, which is expected to approach northern Japan.



Rain and snow will fall widely on the Sea of Japan side. Heavy snow is likely to fall in the mountains of western Japan, which will be affected by the cold air, and caution is required regarding increased snowfall and traffic disruptions due to frozen roads. If you are driving on mountain passes, please check the latest information. Snow may accumulate even on flat ground, so caution is required regarding snowfall.
Snow will start falling in Sapporo at night, so please be careful if you are returning home late.

Rain is likely to fall in the Hokuriku region from the morning, and is expected to change to snow at night. Please be careful of deteriorating road conditions.

Most areas on the Pacific side will be sunny.
In the Kanto region, rain will remain in some areas until morning, but the weather will gradually improve and the sunshine will return.
Please be careful of strong winds as winds will strengthen in various areas.