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💴 | Where can I check the prediction of the "linear rain zone" of caution from now on?Let's check the "evacuation place" in case of emergency!


Where can I check the prediction of the "linear precipitation zone" of caution from now on?Let's check the "evacuation place" in case of emergency!

If you write the contents roughly
The forecast for the occurrence of the linear precipitation zone will be announced as supplementary information on the alert level.

What is a linear precipitation zone? A "linear precipitation zone" is a line with a width of about 20 to 50 km and a length of about 50 to 300 km. → Continue reading

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Linear precipitation zone

Linear precipitation zone(Senjo Kosuitai) says, "The developed rain clouds that occur one after another.Cumulonimbus) Is lined up and organized by a group of cumulonimbus clouds that pass or stagnate in almost the same place for several hours.precipitationRain area with "" (Japanese Meteorological Agency Eur-lex.europa.eu eur-lex.europa.euForecast term used in etc.)[1]..That is, it is a natural phenomenon in which cumulonimbus clouds are generated one after another in a line and pass through and stagnant at almost the same place, and as a result, extremely heavy rain continues to fall on a specific area for a long time.

JapanAnd thisthe termHas come to be used frequently2014 OfHeisei 26 year 8 month heavy rainbySediment disaster in Hiroshima citySeems to be after[2].


The entity of the linear precipitation zone is a collection of multiple cumulonimbus clouds.Meso convection systemIs considered to be a type of[2].. In some cases, it has a hierarchical structure of "linear precipitation zone-cumulonimbus cloud group-cumulonimbus cloud".[2]..LocalTorrential rainIt seems that it is the cause.

Meteorological Research Institute, Japan Meteorological AgencybyradarIn the analysis of observations1995(HeiseiFrom 7 years)2006Occurred in (18)typhoonOf the 261 heavy rainfalls other than the above, about 6% (168) were caused by the linear precipitation zone.Occurs all over Japan, especially in western Japan (KyusyuとChushikoku).Although the mechanism of occurrence has not been fully elucidated, the four conditions that are likely to occur are "inflow of warm and moist air that is the source of clouds" and "the air is mountainous or cold."(I.e."Rising due to collision, etc." "Unstable atmospheric conditions that easily generate cumulonimbus clouds" "Wind in a certain direction that is created by flowing cumulonimbus clouds" are mentioned.[3].

In Japan, linear precipitation areas are often seen during torrential rains.the 1990sWas pointed out by[2]..Hiroshige Tsuguchi and Teruyuki Kato of the Meteorological Research Institute have been working since 1995.2009(21)4 - 11We objectively extracted cases of torrential rains that occurred in Japan during this period, and performed statistical analysis on the shape of the precipitation area.as a result,typhoonIt was revealed that linear precipitation zones occurred in about two-thirds of the cases, except for those caused by[2][4][5].. in recent years,July 24 Heavy rain in northern Kyushu[2],August 25 Heavy rain in Akita and Iwate[2],Sediment disaster in Hiroshima city due to heavy rain in August 26[6],September 27 heavy rain in the Kanto and Tohoku regions[6],July 29 Heavy rain in northern Kyushu[6],Heisei 30 year 7 month heavy rain(Heavy rain in western Japan)[7],July 2nd year of heavy rain[8]Occurred in.


Due to the internal structure of the mid-latitude linear precipitation zone,

  1. Back building type
  2. Back and side building type

are categorized.

Observation / prediction

In Japan, the Japan Meteorological Agency2021(ReiwaFrom June 3th, the risk of disasters caused by heavy rain has increased sharply (6 years).Vigilance level(Equivalent to 4 or more), and in a situation where extremely heavy rain due to the linear precipitation zone continues to fall in the same place.Information about heavy rainHas announced[9].. further2022(Reiwa 4th year) From June 6st, forecast information from about half a day ago for a wide area such as "Northern Kyushu" (Weather information) Has started to be provided[10][11].

The Japan Meteorological Agency will provide advance information on future information improvements to convey the possibility of heavy rainfall due to the linear precipitation zone.2024ToPrefecturesIn units2029ToRisk distributionIn the format of市町村In each case, it aims to provide forecast information from half a day in advance so that the degree of danger can be grasped in units.In addition, as predictive information that conveys a specific rain area due to the linear precipitation zone,2023Forecast information immediately before the target of 30 minutes ago,2026Will start providing forecast information at an earlier stage, targeting 2-3 hours ago.[12].



[How to use footnotes]
  1. ^ “[xnxx.com Forecast terminology used by the Japan Meteorological Agency (as of March 2017) Rain-related terminology linear rain zone]”. Japan Meteorological Agency. April 2017, 7Browse.
  2. ^ a b c d e f g Tsukuchi (2016), p.11
  3. ^ [Close-up science] "Linear precipitation zone" occurs all over the country Consecutive torrential rains, difficult to predict"Sankei Shimbun』Morning edition March 2017, 8 (viewed August 21, 2017)
  4. ^ Tsuguchi and Kato (2014), p.19
  5. ^ Chiezo mini (October 2017, 7). “Linear precipitation zone". Asahi Shimbun Publishing. April 2017, 7Browse.
  6. ^ a b c "The cause of heavy rainfall in the" linear precipitation zone "where cumulonimbus clouds gather in a band". Yomiuri Shimbun(November 2017, 7). originalArchived as of October 2017, 7.. https://web.archive.org/web/20170705213928/http://www.yomiuri.co.jp/science/20170705-OYT1T50044.html April 2017, 7Browse. 
  7. ^ Cumulonimbus clouds that occur in various parts of the "linear precipitation zone" one after another at the same placeAsahi ShimbunDIGITAL (2018 October 7) Retrieved 11 September 2018.
  8. ^ “Why the Kuma River floods? A band of cumulonimbus clouds over the basin, terrain that is difficult to deal with”. Asahi Shimbun(November 2020, 7). originalArchived as of October 2020, 7.. https://web.archive.org/web/20200710042528/https://www.asahi.com/articles/ASN7466NQN74ULBJ002.html April 2020, 7Browse. 
  9. ^ "Various information about the linear precipitation zone: What is the weather information about the remarkable heavy rain?". Japanese Meteorological Agency. April 2022, 6Browse.
  10. ^ "About the start of linear precipitation zone prediction (PDF)”. Japan Meteorological Agency (April 2022, 4). April 2022, 4Browse.
  11. ^ "About improvement of how to convey disaster prevention weather information from the flood season (PDF)”. Japan Meteorological Agency, Atmosphere and Ocean Affairs Department, Water Management and Land Conservation Bureau, River Planning Division (May 2022, 5). April 2022, 5Browse.
  12. ^ "Attachment (PDF)”. Japan Meteorological Agency, Atmosphere and Ocean Affairs Department, Water Management and Land Conservation Bureau, River Planning Division (May 2022, 5). April 2022, 5Browse.

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