Atmospheric instability over a wide area Heavy rain in Kochi Prefecture September 11 8:36
Due to the cold air in the front and sky, the atmospheric conditions became very unstable over a wide area on the 11th, and it is thought that severe rain of more than 120 mm fell in Kochi Prefecture. There is a risk of very heavy rain locally from Kanto Koshin to Kyushu on the 12th, and it is necessary to pay attention to sediment disasters, low land inundation, and lightning strikes and gusts.
According to the Japan Meteorological Agency, due to the cold air in the sky and the warm, moist air flowing toward the front line, the atmospheric conditions became very unstable in various places on the 10th, and heavy rain fell in Miyagi Prefecture and Aichi Prefecture.
On the morning of The 11th, rain clouds developed mainly in western Japan, and radar analysis showed that more than 120 millimeters of heavy rain fell in the hour leading up to 8 a.m. near Kuroshio Town, Kochi Prefecture, and the Japan Meteorological Agency released “Record Short-Time Heavy Rainfall Information.”
Over a wide area from Kanto Koshin to Kyushu on the 12th, there is a possibility of very heavy rain of more than 50 millimeters per hour accompanied by local lightning, and the amount of rain falling in the 24 hours until the morning of the 12th is expected to be 100 mm in tokai and 80 mm in Kanto Koshin.
In Tokai and Kanto Koshin, due to the approaching tropical cyclones near Ogasawara, additional 100 to 150 millimeters of rain may fall in the 24 hours leading up to the morning of the 13th, resulting in heavy rain.
The Japan Meteorological Agency has called for careful attention to landslides, low land inundation, river flooding, gusts such as lightning strikes and tornadoes, and “hyo.”
If there are signs of developed product clouds approaching, such as sudden darkening and cold winds, move to a sturdy building or, if you are indoors, close the curtains and move to a room with few windows to ensure safety.