On the 25th of last month, a week ago, it was a record heavy rain in Chiba and Fukushima prefectures where it would rain in the first half of October in only half a day.news world ahmed
According to the Japan Meteorological Agency, a low pressure approached Kanto on the 25th of last month, and Typhoon No. 21 was moving northeast off the east of Ahmed Kanto.
For this reason, warm air from low pressure from the south continued to flow from the east from Chiba Prefecture. News World Ahmed
In addition, at that time, the inland of Kanto was cold due to the temperature falling due to the rain that preceded it.
By hitting this cold air with warm air from two directions due to low pressure and typhoon, a local front was generated, and it continued to stagnate near Chiba Prefecture, causing heavy rain.
After this, the cyclone began to move northward, but this time it approached the high pressure centered around the Kuril Islands and the pressure gradient increased, and in the Tohoku region such as Fukushima Prefecture, the east-side humid air continued to flow in. It was a heavy rain.
According to the Japan Meteorological Agency, the short-term heavy rains caused by local fronts are likely to occur on the Pacific coast where wet air easily enters, but are difficult to predict accurately.
Naoji Nakamura, Ahmed a forecaster at the Japan Meteorological Agency Forecasting Division, said, “The inland cold air is a very localized phenomenon, and it is difficult to predict the front. Forecasts may change from moment to moment. I always want you to check the latest weather information. "