[Hokkaido] Rain expected across a wide area on the 5th; caution advised for heavy rain in the Iburi and Hidaka regions.

2026/11/04 17:32

Good evening. Here is the weather forecast for the Hokkaido region.
Today, Hokkaido was under the influence of a high-pressure system, resulting in clear skies across a wide area.



Although there were some scattered rain and snow showers in the Kamikawa and Rumoi areas, the weather is expected to gradually improve tonight.



Meanwhile, tomorrow, the 5th, the weather across the entire region is expected to deteriorate due to a low-pressure system moving toward the waters off the Sanriku coast, as well as an approaching pressure trough.



Expect cloudy skies and rain in the central, eastern, and southern parts of Hokkaido,
with the possibility of heavy rainfall in the Iburi and Hidaka regions.



Additionally, please be cautious of strong winds, as the pressure gradient will increase. If you are heading out tomorrow, please bring a large umbrella.
That concludes the weather forecast for the Hokkaido region.

Significant rainfall expected tomorrow, the 5th; short-sleeved attire might be appropriate on Friday the 6th, with unseasonably warm weather in Tokyo.

2026/11/04 16:49

Tomorrow, the 5th, a pressure trough is expected to form over the main island of Honshu. Additionally, a low-pressure system accompanied by a front will likely pass across the region.

Furthermore, warm, moist air flowing in from Typhoon No. 31-which is moving north-northeast south of Japan-will cause atmospheric conditions to become unstable, leading to rain across the country.

Active rain clouds may develop, potentially causing temporary intensifications in both rainfall and wind. Please stay tuned for the latest weather updates.



On Friday the 6th, a ""winter-type"" pressure pattern-characterized by high pressure to the west and low pressure to the east-will set in, likely resulting in continued rough weather across northern Japan.
Meanwhile, conditions from the Kanto region westward will improve; as warm air flows in following the passage of the low-pressure system, temperatures in the Kanto region are expected to rise.



In Tokyo, the high is expected to reach 26C-a level of warmth typical of late September.
During the day, it may feel too hot in long sleeves, making short-sleeved clothing a more comfortable choice.



Temperatures will fluctuate significantly during the latter half of the week. Please take care of your health and dress in layers that are easy to put on or take off, so you can adjust accordingly."

[Kanto Region] Rain to intensify from this evening; caution advised for heavy rain and strong winds tomorrow, the 5th (Report by AI presenter)

2026/11/04 12:45

Here is the weather forecast for the Kanto region.
While the area around Honshu is under the influence of a weak high-pressure system, there is a trough of low pressure near the Izu Islands.



Today, the 4th, the Kanto region is covered in thick clouds due to a trough of low pressure and the influx of moist air.
Currently, it is cloudy across the Kanto region, with some areas experiencing light, scattered rain. By this evening, the rain is expected to become more steady. If you are returning home late, it would be a good idea to carry a large umbrella.



Tomorrow, a low-pressure system is expected to form off the Boso Peninsula, leading to highly unstable atmospheric conditions. From tomorrow morning through the evening, there is a risk of intensifying rain and stronger winds across the Kanto region, so please stay updated with the latest weather information.



From the day after tomorrow onwards, there are no major weather disturbances expected, and we can look forward to more days with sunshine.

https://youtu.be/pYS8L_VHcTA?si=4JB4oX1lL8MlXBWz

[Typhoon Names] Who decides the names of typhoons? How are Asian names for typhoons determined?

2026/11/03 20:29

Typhoon No. 31, which formed in the Marshall Islands on Saturday, October 15, is named "In-fa." This name-appearing in news reports-is known as an "Asian name." These names have been used since 2000 with the goals of respecting the cultures of various Asian nations and regions, strengthening solidarity, promoting mutual understanding, and raising public awareness regarding disaster prevention.

A sequence of 140 names
The "Typhoon Committee"-comprising 14 countries and regions, including Japan-has compiled a list of 140 names, with each member contributing 10. When a typhoon forms in the Northwest Pacific or the South China Sea, it is assigned a name from this list in sequential order. The first name used was "Damrey" (meaning "elephant" in the Cambodian language) for the first typhoon of 2000; once all 140 names have been used, the cycle begins again from "Damrey." Given that the annual average number of typhoons is 25.1, the full list cycles through approximately every 5 to 6 years.

A system distinct from "numbering"
Typhoon numbers are assigned by the Japan Meteorological Agency (JMA) based on the order in which typhoons form from January 1st of each year. If a typhoon weakens into a tropical depression and subsequently re-intensifies, it retains its original number. In contrast, names are assigned according to their position on the list, meaning the same name does not necessarily recur every year. Typhoon No. 31, "In-fa"-which formed on Saturday, October 24-was proposed by Macau and means "fireworks." Within Japan, typhoons are typically referred to by their numbers, while in English-language contexts, their names are used.

Japan's contributions: Constellation names
All 10 names proposed by Japan are derived from constellations: Canis Minor (Little Dog), Puppis (Stern), Serpens (Serpent), Dorado (Swordfish), Lyra (Harp), Cetus (Whale), Ursa Minor (Little Bear), Horologium (Clock), Lacerta (Lizard), and Lynx (Wildcat). Typhoon No. 29, "Koguma," which formed on October 5, was named after the constellation Ursa Minor (the Little Bear). The name was chosen because it is "neutral" and familiar to people, rather than being based on a person's name, a geographical location, or a meteorological phenomenon. Criteria for these names include being no more than nine letters long, being easy to pronounce, and having no offensive meanings in the languages ??of other countries or regions.

Unique Names
Some names are quite unique: "Dim-sum" (from Hong Kong) refers to the well-known Cantonese cuisine; "Babinka" (from Macau) is a type of pudding; and "Neoguri" (from South Korea) means "raccoon dog." The list includes a wide variety of names, ranging from plants, animals, and food to figures from mythology.

Names That Are "Retired"
When a typhoon causes a major disaster, its name may be retired-meaning it will no longer be used-at the request of a member country or region. For example, the names "Faxai" (Typhoon No. 15, 2019) and "Hagibis" (Typhoon No. 19, 2019)-both of which caused extensive power outages, including in Chiba Prefecture-have been retired.

Names for "Cross-Boundary" Typhoons
In the case of a "cross-boundary" typhoon-a hurricane that crosses the 180th meridian (the International Date Line) and becomes a typhoon-the responsibility for tracking it shifts from the Central Pacific Hurricane Center (in the U.S.) to the Japan Meteorological Agency (JMA). If the maximum sustained wind speed is 17.2 m/s or greater, it is classified as a typhoon.
In such cases, the name is not taken from the standard list of Asian typhoon names; instead, the name originally assigned to it is retained.
"Nolo," which became a cross-boundary typhoon on October 5 of this year, is one such example.

[Typhoon Information] Typhoon No. 31 is moving northeast south of Japan; rain is expected to intensify in the Kanto region.

2026/11/03 20:07

As of 6:00 PM today, Tuesday the 3rd, Typhoon No. 31 (In-fa) is believed to be moving slowly westward to the south of Japan.

Typhoon No. 31 - Tuesday, the 3rd, 6:00 PM
================================
Center Location: South of Japan
Size: -
Intensity: -
Movement: North-northwest, moving slowly
Central Pressure: 975 hPa
Maximum Sustained Wind Speed: 30 m/s (near the center)
Maximum Gust Speed: 45 m/s
================================




Outlook
Typhoon No. 31 is expected to move slowly northward to the south of Japan.
It is then projected to shift its course toward the northeast by the day after tomorrow, Thursday the 5th, and approach the Ogasawara Islands.
In the Ogasawara region, please exercise caution regarding strong winds and high waves accompanied by swells from Thursday the 5th through Friday the 6th.
Additionally, in the Kanto region and the Izu Islands, the influx of moist air?driven by both a high-pressure system and Typhoon No. 31?may lead to heavy rainfall, with some areas potentially seeing over 100 mm of rain within a 24-hour period. In the Kanto-Koshin region, please remain alert and take precautions against landslides, flooding in low-lying areas, and rising river levels on Thursday, the 5th.







Following this, the system is expected to accelerate as it moves northeast, eventually moving away from Japan toward the east. Waves along the Pacific coast are forecast to gradually increase in height; therefore, if you are planning any coastal or marine activities from the 6th onwards, please exercise caution and remain alert to the risk of high waves.

Risk of heavy rain in the Kanto region; be prepared for intense downpours and thunderstorms this coming Thursday, the 5th. Conditions could potentially reach the level of a weather warning.

2026/11/03 18:31

Weather conditions are expected to deteriorate, starting in the Kanto region on the evening of Wednesday the 4th, and spreading nationwide by Thursday the 5th. On Thursday the 5th in particular, there is a risk of heavy, warning-level rainfall in Chiba Prefecture, eastern Kanagawa Prefecture, and the Izu Islands; caution and vigilance are advised regarding potential landslides and flooding.

Although the Japanese archipelago will be under the influence of a high-pressure system on Wednesday the 4th, the Pacific side of eastern Japan will be affected by moist air. The day will be mostly cloudy, with rain expected to begin in some areas by the evening.





By the morning of Thursday the 5th, a low-pressure system is expected to form near the Izu Islands and move northeastward along the coast of the Kanto region while intensifying. The convergence of warm, moist air?circulating around both the high-pressure system and Typhoon No. 31?will lead to highly unstable atmospheric conditions across the Kanto region. On Thursday the 5th, some areas may experience intense rainfall accompanied by thunderstorms. Should rain clouds develop more strongly than anticipated, or remain over the same location for an extended period, there is a possibility of heavy, warning-level rainfall.



Expected rainfall (from 18:00 on the 4th to 18:00 on the 5th; in areas with the heaviest rain)
Izu Islands: 150 mm
Southern Kanto region: 120 mm
Northern Kanto region: 100 mm

In the Kanto-Koshin region, please remain alert and take precautions against landslides, flooding in low-lying areas, and rising river levels on Thursday, the 5th. Also, be mindful of the potential for lightning strikes and sudden gusts of wind, and stay updated with the latest weather and transportation information.

Weather for tomorrow, Wednesday the 4th: Rain or snow in Hokkaido until the morning; conditions expected to deteriorate across Western and Eastern Japan in the afternoon.

2026/11/03 13:05

Tomorrow, Wednesday the 4th, the area around Honshu will generally be under the influence of a high-pressure system; however, the center of this system is expected to gradually shift eastward, moving away from Japan. Additionally, a trough of low pressure is forecast to pass over Northern Japan by the morning.



As the region falls behind the high-pressure system?and with Typhoon No. 31 moving northward?moist air from the south will likely flow in. By evening, rain is expected in some areas along the Pacific coast, including the southern Kinki region, Tokai, and Kanto.



In Hokkaido and the Tohoku region, there will be some snow or rain, though many areas along the Pacific coast are expected to remain clear.

In the Kanto and Tokai regions, clouds will tend to spread along the Pacific coastline, gradually thickening throughout the afternoon; by evening or later, rain may begin to fall in some places.

Across the Kinki, Chugoku, Shikoku, and Kyushu regions, there may be some sunshine during the morning, but cloud cover will increase as the day progresses. In the Kinki region, rain is expected to begin late in the evening.

[Typhoon Information] Typhoon No. 31 (Infa) is moving northward south of Japan. Be aware of high waves and strong winds in the Ogasawara Islands. Heavy rain is also possible near Honshu.

2026/11/03 07:44

As of 6:00 a.m. today, Tuesday the 3rd, Typhoon No. 31 (In-fa) is located south of Japan and is moving slowly toward the northwest. It has a central pressure of 980 hPa, with maximum sustained winds of 30 m/s near the center and peak gusts of 40 m/s. Within a radius of 95 km from the center, the storm is producing violent winds of 25 m/s or greater.



# Typhoon No. 31 - Tuesday, the 3rd, 6:00 AM
--------------------------------------
Center location: South of Japan
Movement: Northwest, moving slowly
Central pressure: 980 hPa
Maximum sustained wind speed: 30 m/s (near the center)
Maximum instantaneous wind speed: 40 m/s
--------------------------------------

Typhoon No. 31 is expected to continue moving in a northwesterly to northerly direction. Around Thursday, the 5th, it is forecast to shift its course toward the northeast and pass closest to the Ogasawara Islands. By Friday, the 6th, it will move east of Japan, and by Saturday, the 7th, it is expected to transition into an extratropical cyclone east of the Kuril Islands.

While there is still some uncertainty regarding its exact path, the Ogasawara Islands are likely to experience worsening weather-with intensifying rain and wind-centered around Thursday, the 5th. Sea conditions will also be rough, with high waves.
Depending on the typhoon's track, there is a risk of warning-level gale-force winds on Thursday, the 5th, and warning-level high waves from Thursday, the 5th, through Friday, the 6th.
Please be sure to check for the latest information on the typhoon.







Although the system is currently expected to move away from Honshu, wave heights along the Pacific coast are likely to increase. Even if the weather appears to calm, do not let your guard down. If you are planning activities such as fishing, please check the latest information and avoid approaching potentially dangerous coastal areas.

Additionally, around Thursday the 5th, a low-pressure system and a front are expected to bring rain to a wide area around Honshu. The influx of warm, moist air-associated with Typhoon No. 31-may intensify the front, potentially leading to heavier rainfall, particularly along the Pacific coast. Please be sure to check for the latest updates.

Weekly weather: Tomorrow, the 3rd, will be a good day for outings; rain is expected to become widespread around the 5th.

2026/11/02 21:08

Here is the weather forecast for the coming week. Tomorrow, the 3rd (Tuesday, Culture Day), will be mostly sunny in many areas. Around the 5th (Thursday), the passage of a low-pressure system is expected to bring rain to a wide area.
Following the passage of this system, a "west-high, east-low" pressure pattern will develop, likely leading to rainy conditions along the Sea of ??Japan coast.
Due to the influence of Typhoon No. 31, the Ogasawara Islands may experience high waves and strong winds-potentially reaching warning levels-from the 4th (Wednesday) onwards. Please check for the latest weather information.



Tomorrow, the 3rd (Tuesday, Culture Day), the area around Honshu is expected to be under the influence of a high-pressure system. While some rain may fall along the Sea of ??Japan coast during the morning, conditions will gradually improve. From the Tohoku region down to Okinawa, many areas will see sunshine, making it a great day for outings.
Meanwhile, Hokkaido will be under a trough of low pressure, with rain or snow expected in some places, particularly along the Sea of ??Japan coast.
Temperatures will generally be around or above the seasonal average.

On Wednesday the 4th, while high pressure will continue to cover the area around Honshu, conditions will be prone to rain in Hokkaido and the region stretching from Kanto to Tokai.

On Thursday the 5th, a low-pressure system accompanied by a front is expected to pass near Japan, bringing rain to a wide area from Hokkaido to Kyushu. Warm, moist air flowing in from Typhoon No. 31 may lead to heavy rainfall, particularly along the Pacific coast. Please stay tuned for further updates.

The powerful Typhoon No. 31 is currently moving west-northwest in the waters near the Ogasawara Islands and is expected to make its closest approach to the archipelago around Thursday the 5th. There is a risk of warning-level high waves and violent winds, as well as the potential for intensifying rainfall. Please check for the latest information regarding the typhoon.

From Friday the 6th to Saturday the 7th, the low-pressure system will move away to the east of Japan, and a "west-high, east-low" pressure pattern-characterized by higher pressure to the west and lower pressure to the east-is expected to develop. With a low-pressure system projected to move toward the vicinity of Sakhalin, widespread rain or snow is expected in Hokkaido, while rain is likely along the Sea of ??Japan side of the Tohoku region and in the Hokuriku region.

From Sunday the 8th to Monday the 9th, another low-pressure system will pass near Japan, followed once again by a "west-high, east-low" pressure pattern. Snow is expected in Hokkaido-primarily along the Sea of ??Japan coast-while the Sea of ??Japan side of the Tohoku region and the Hokuriku region will likely continue to see periods of rain.


Over the coming week, temperatures are expected to rise around Thursday the 5th and Friday the 6th, before dropping significantly from Saturday the 7th onward due to the arrival of cold air. In Hokkaido, daily highs are forecast to fall into the single digits (Celsius), with lows dropping to around 0C-a notably chilly outlook. It would be wise to prepare warm clothing and cold-weather gear.
In Tokyo, too, daily lows may dip into the single digits by the weekend, making it necessary to have heavy jackets or coats on hand. It looks to be a week where the progression of the seasons will truly be felt.

Powerful Typhoon 31 moves westward near the Ogasawara Islands; rain possible in the Kanto region between the 4th and 5th.

2026/11/02 19:09

As of 3:00 PM today, Monday the 2nd, Typhoon 31 (In-fa)?a "strong" category storm?is moving west-northwest at a speed of 15 km/h in the waters near the Ogasawara Islands.




Typhoon 31 (In-fa) ? As of 3:00 PM, Monday the 2nd
-----------------------------
Location: Near the Ogasawara Islands
Size: -
Intensity: Strong
Movement: West-northwest at 15 km/h
Central Pressure: 970 hPa
Maximum Sustained Wind Speed: 35 m/s (near the center)
Maximum Instantaneous Wind Speed: 50 m/s
------------------------------



Typhoon 31 is expected to continue moving northwest through tomorrow, Tuesday the 3rd, before gradually increasing its speed and turning toward the northeast. While it is considered unlikely that the storm will approach or make landfall on Honshu, the region will be affected by warm, moist air flowing from the typhoon. Consequently, rain is expected on Wednesday the 4th, primarily along the Pacific coast of Eastern Japan. By Thursday the 5th, the influence of a low-pressure system moving from the East China Sea toward Western Japan will also come into play, leading to rainy or cloudy conditions across the country.

In the Ogasawara Islands, please be cautious of strong winds and high waves accompanied by swells from the day after tomorrow, Wednesday the 4th, through around Friday the 6th. Additionally, starting Wednesday the 4th, wave heights are expected to increase?with accompanying swells?in areas including the Izu Islands and the Pacific side of Eastern Japan.



Depending on the storm's future path, there is a risk of violent winds in the Ogasawara Islands and heavy rain in the Izu Islands on Thursday the 5th. Please check for the latest information regarding the typhoon.