Before the full-scale rainy season, the Japan Meteorological Agency and the Ministry of Land, Infrastructure, Transport and Tourism will change the way disaster prevention information is transmitted, and a "linear rain zone" will occur in which developed cumulonimbus clouds form a band and bring heavy rain. If there is a risk of this, we will announce it in the weather information from half a day to 6 hours in advance.
The "linear rain zone" has been repeatedly confirmed due to the disaster caused by heavy rain, and the Japan Meteorological Agency has clarified the details of new information to be announced when it may occur from the 1st of next month.
According to this, information is issued for each of 11 regions nationwide such as "Kanto Koshin" and "Northern Kyushu", and "Linear precipitation zone may occur" in "Local weather information" and "Prefectural weather information". We call for caution by including the wording.
Initially, I explained about the timing of information announcement about half a day ago, but after changing the operation to have a range of "from half a day ago to 6 hours ago", 12 hours ago and 6 hours ago As the rain conditions and the time that residents can evacuate are different, we will try to make an announcement as soon as possible.
In addition, the "hit rate" seen from past cases is only about once every two times in the whole country and about once every four times in the local unit, so-called "linear precipitation zone" that occurs without information. "Missed" is about twice every three times.
The Japan Meteorological Agency said, "It is difficult to make an accurate prediction with the current technology, and even if you make a call, a linear precipitation zone will not always occur, but it is highly possible that the situation will deteriorate sharply due to heavy rain. I want them to raise their sense of crisis when information is provided, and to prepare for disasters by checking hazard maps, evacuation sites, and evacuation routes. "
Japan Meteorological Agency Secretary “When the information is released, there is a sense of crisis in the heavy rain disaster”
Regarding new information that calls for caution from half a day to six hours before the occurrence of a linear precipitation zone, Naoyuki Hasegawa, Secretary of the Japan Meteorological Agency, said, "When this information is announced, there is a sense of crisis about heavy rain disasters. I would like you to check the "Kikikuru" that shows the risk of disaster in different colors and check the evacuation route etc. For the disaster prevention staff of the local government, the procedure for opening an evacuation center I would like you to make preparations so that you can take disaster prevention measures at any time, such as checking the flood control posture. "
On the other hand, when asked about the fact that the prediction accuracy is not always high, "It is difficult to predict accurately, and there may be" missed "or" missed ", but once it occurs, it is a linear precipitation zone that leads to disasters, so other I want you to use it together with warnings and sediment-related disaster warning information. "
In addition, regarding the fact that the information announcement that was initially set to "half a day ago" was expanded to "from half a day ago to 6 hours ago", "there is information that cannot be predicted half a day ago and can be understood after a while, so it is concrete. It is the result of considering the general operation to the end. Even if the announcement time is a little late, I think it is meaningful to convey the possibility when it is understood and to have a sense of crisis in advance. " ..