天気と災害の情報共有

Due to the stationary autumn rain front, strict vigilance is required for prolonged rainfall in Kyushu, with some areas experiencing flooding caused by linear precipitation zones. The front is expected to move from Kyushu, Chugoku, Shikoku, and Kinki, then exit towards the South Pacific from Tokai. Consequently, areas directly beneath the front need to be wary of incoming rain clouds, while the Kanto region will experience weather conditions that call for a folding umbrella. Most of Ibaraki, Gunma, and Tochigi, along with Fukushima and Miyagi prefectures, will not see clear skies but the signs of rain are weak. On the other hand, Hokkaido will be directly hit by a cold vortex, resulting in a day of incessant rain sounds. The cold vortex is expected to rapidly intensify with the rain front by tomorrow, necessitating caution in all Tohoku prefectures. Typhoon No. 26 is located south of Okinawa, with a central atmospheric pressure of 980hPa and is still strengthening. Although no strength or size categories have been announced, it is expected to be relatively small and slightly strong, and is forecast to be announced as a strong typhoon tomorrow, with its future path heading south of Shikoku. While its trajectory towards the northeast within the forecast cone is confirmed, the cone itself is very wide, suggesting increased unpredictability due to its interaction with the rain front. The long-term forecast indicates the next typhoon approaching next Saturday. With isobar lines indicating 4 or more, it's expected to be a strong low-pressure system, so continued attention to typhoon information is necessary.

The autumn rain front is expected to make its strongest impact, with the entire archipelago anticipating rain. Additionally, a strengthening cold air mass will cause temperatures to drop. It's important to note that Tokyo's forecasted high of 24 degrees Celsius was observed shortly after midnight. By 4 AM, temperatures will have fallen below 22 degrees, and will rapidly decrease from around 9 AM as the rain intensifies. By 2 PM, the peak temperature time, it will drop below 20 degrees, and then rapidly fall to an overnight low of 18 degrees Celsius. Be sure to bring a jacket so you're not fooled by the forecast temperatures. Be aware of the rain's impact, as heavy rainfall is expected from Kitakyushu to Shikoku, and from Tokai to Kanto. The autumn rain front is gradually moving towards the Pacific, and while it won't rain from night into Sunday, the clouds will persist. Typhoon No. 26 is currently heading towards the Sakishima Islands at 1000hPa and is almost certain to move northeast along the southern coast of Naha. It is currently classified as weak with no strength category, but it is expected to strengthen into a powerful typhoon with a storm surge and head towards the mainland. Depending on the influence of the autumn rain front, there is a high probability of heavy rain hitting the islands, so please keep an eye on the typhoon's movements from tomorrow onwards.

I expect today's weather to be described as sunny with occasional clouds, but this 'sunny' notation includes the weather before sunrise, and clouds will dominate the entire day from noon until night. Nationwide, the signs point to strong cloud cover, keeping temperatures just shy of 30 degrees Celsius. However, some areas should be cautious of sudden showers. Tomorrow (Sat), the weather will shift dramatically to rain. Due to the autumn rainy season front moving back over the archipelago, you'll likely need an umbrella all day. Kyushu and the Chugoku region should be wary of heavy rainfall, with the possibility of linear rain bands forming. The Kanto region will also experience stronger rainfall. Part of the autumn rainy season front will move down to the Pacific Ocean east of Japan, causing it to develop into a southern coastal low-pressure system. Warmer currents flowing in from the east will bring rain. Typhoon No. 26 is expected to approach or make landfall in Naha as per the ensemble forecasts and then move eastward, projected to be in the waters south of Shikoku by Wednesday. The reason it's not approaching Honshu is estimated to be the influence of the autumn rainy season front; the front to the north is preventing its northward movement. This situation is quite problematic in terms of rainfall, as the typhoon maintains its strength while supplying warm currents to the front. It's expected to move east from the Sakishima Islands with strong intensity on Saturday, so areas around Okinawa should also be on alert.

In the Kanto region, clear daytime weather is expected for the first time in a week. Although Tuesday is also forecasted to be sunny, this is due to the aftermath of a typhoon passing through in the early morning. The typhoon is expected to move out around 2 AM, and the clouds will clear immediately afterward, resulting in clear skies. However, as the sun rose almost simultaneously with the clouds covering the sky, we couldn't see the sun. The forecast for clear weather is expected to continue for today and tomorrow, with some clouds mixed in at times, but generally stable weather conditions are anticipated. Due to the widespread clear skies, temperatures are expected to range from 28 degrees Celsius, with the possibility of exceeding 30 degrees in some areas. In affected regions, please be mindful of heatstroke and take advantage of the clear weather. Typhoon No. 26 is estimated to head towards the Sakishima Islands in Okinawa. Following that, long-term forecast models from overseas meteorological agencies are presenting quite interesting information. This is an ensemble forecast, so accuracy is disregarded, and it's a method of calculation considering unpredictability. While there are a fair number of predictions showing it moving west from the Sakishima Islands towards mainland Taiwan, many forecasts indicate it passing by Naha and moving east along the southern coast of Honshu. This is expected to happen at the earliest after the beginning of next month, i.e., next weekend, so it's okay to ignore it for now. On the other hand, it's worth noting the possibility of it merging with a weather front to become a 'combined typhoon,' similar to Typhoon No. 25.

Typhoon No. 25, which caused extensive damage, has moved away from the archipelago, and cloudiness is expected to increase again. While the influence of a separate low-pressure system from the front will suppress temperature rises, it will lead to intermittent rain. Although we were concerned after observing numerous hot days early in the first year of the "Extreme Heat Day" designation, the next week will be characterized by clouds and rain, with the heat peaking at midsummer temperatures. A front is expected to move in again from the continent this weekend. Separately, there is a long-term forecast for a relatively large low-pressure system approaching from the south. While I will refrain from mentioning specifics as it's not yet confirmed, its movement is predicted to be long-term, similar to a tropical depression. Therefore, please pay attention to weather developments. This low-pressure system is forecast to head towards Okinawa, with heavy rain predicted around that time, so caution is advised.

Currently, there are 2 confirmed deaths and 5 missing persons. Unlike the heavy rains in Chiba, this time all the damage resulted from landslides. In Chiba Prefecture, there was a relatively reckless situation where attempts were made to remove the collapsed soil during the disaster, and special attention is needed because areas that have once collapsed are prone to further instability. Meanwhile, in Kanagawa Prefecture, landslides directly hit houses, burying many people. Due to the immense scale of the damage, the Self-Defense Forces have been requested for disaster relief. Saying that the hill behind your house has never collapsed before is a very weak justification. Disasters tend to escalate, and it should be noted that this is the result of cumulative effects, not just this single event. Although there hasn't been direct damage from flooding itself, driving through flooded areas has been quite noticeable. While water levels below 10cm may not result in significantly bad outcomes, places that have flooded in the past tend to flood repeatedly. Chiba City is reportedly receiving a series of reports of vehicle accidents due to flooding. Believing it won't happen again is mere idealism and escapism. Please keep this in mind and learn from it for future events.

The rain has been getting heavier since this morning.

I love seeing everyone's real-time comments like this🤭 Sometimes there are humorous comments or helpful ones, so I end up checking them out🙂↕ Looking at the image, it seems like it's pouring rain on the east side☔ Please be especially careful if you're in the vicinity🙏🏻´-

As of yesterday, the peak of the rain was expected around noon today, but from last night into the early morning, torrential downpours lasted for a long time. As a result, Level 4 danger warnings were frequently issued, and a Level 5 Special Heavy Rainfall Warning for Landslides was issued in Sakura City. Changes are also being seen in the rain forecast, which was expected to start around noon today. The cause of the heavy rain before the typhoon's approach is attributed to the stimulation of the previous rainy season front. Short-term forecasts indicate that even if it becomes temporarily intense within the predicted range, it will not be for an extended period. However, the cumulative rainfall has already reached a considerable amount, and various heavy rainfall warnings for landslides have been issued. There are also predictions of linear precipitation zones forming, making major disasters inevitable wherever they occur. We have already passed the first day's difficult phase, but vigilance will continue. Currently, the strong wind zone of the large typhoon is covering a wide area from Kanto to Kinki and Shikoku. The direction is solidifying towards the northeast, north of Hachijojima, south of Miyakejima, and off the coast southeast of Kujukuri Beach. Impact of the storm zone: Chiba Prefecture 80%, Shizuoka Prefecture 41%, Ibaraki Prefecture/Kanagawa Prefecture 34%, Lower Tokyo Metropolis 18%. Based on the predicted path and storm zone, the area of maximum concern will be Chiba Prefecture. Predictions suggest that the total rainfall will further accumulate and exceed that of the August Reiwa 8 heavy rains in Chiba. Please note that the deadline for initiating evacuation actions is noon today, and we pray that everyone takes appropriate measures.

It has developed to a scale of 970hPa and is expected to peak around noon tomorrow. It's becoming a large and strong, typical rain typhoon, absorbing the autumn rainy season front as it approaches. Despite not having made landfall yet, cumulative rainfall in Chiba Prefecture is already significant, and while it's raining quite heavily, severe disasters are certain to occur within a day. The typhoon's direct impact is expected to pass within about 12 hours after its closest approach. On the other hand, torrential rain, like pouring from a bucket with an average hourly rainfall of 15mm, is anticipated to last for at least 6 hours, potentially up to half a day. Given the signs of heavy rainfall reminiscent of the August 2024 Chiba deluge, everyone is advised to obtain the latest weather information. The start of heavy rain was thought to be around 4 PM, but according to the latest information, it's slightly earlier, with heavy rain expected to begin around 2 PM. If we assume a 12-hour period from here, it means torrential rain will fall from midnight into the early morning. While the national and local governments have stated they will implement pre-emptive traffic restrictions on underpasses, it is wise to avoid them today and tomorrow to prevent any potential risks of getting caught. If flooding begins during nighttime walks, it's crucial not to move. If you lack funds for accommodation, please contact your local municipality to search for evacuation shelters.