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梅雨の積乱雲:2024年7月6日(土)
京都市などの近畿地方の平年の梅雨入りは6月6日頃,梅雨明けは7月19日頃であるが,今年は梅雨入りが6月21日頃とだいぶ遅かった。昨年の梅雨入りが5月29日頃であったので,昨年比では約1ヵ月も遅かったことになる。
すでに梅雨入りしてから半月が過ぎたが,湿度・気温・輻射熱の3点セットでみると,今年は例年に比べて,何かが違う。気候変動とは,こういうことを指すのだろう。梅雨の時季であるのに,本日の京都市では,昨日に引き続き36℃を超えて37.2℃まで上昇し,東西南北の空に積乱雲が沸き立っている。夕方,北の空に真っ黒な雷雲が現れ,上賀茂にある京都産業大学キャンパスは夕立ちに見舞われた。
線状降水帯が頻繁に発生することにより,大雨警報が発表される回数も増えたが,線状降水帯による大雨警報であるので,大雨警報が発表された地域でも,ほとんど雨が降っていないことが頻繁に起きている。ピンポイントで大雨が降っているだけである。高温や水害・干ばつによる農作物の不作,新たな感染症や高温等による免疫機能低下などが懸念されるところである。京都の祇園祭(祇園御霊会)が1161年の間(応仁の乱の11年間を除く)続いてきた理由は,いつの時代も疫病や自然災害は絶えることがないということだ。祇園祭が始まった863(貞観5)年から6年後の869(貞観11)年に,マグニチュード8.3を超える貞観地震が東北三陸沖で起きた。
Cumulonimbus Clouds of the Rainy Season:July 6th (Saturday)
The typical rainy season in the Kinki region, including Kyoto City, usually begins around June 6th and ends around July 19th. However, this year, the rainy season started significantly later, around June 21st. Compared to last year, when the rainy season began around May 29th, it was about a month late this year.
Half a month has already passed since the start of the rainy season, but in terms of humidity, temperature, and radiant heat, something feels different this year compared to usual. This might be what climate change is all about. Despite it being the rainy season, Kyoto City today experienced temperatures exceeding 36°C again and rose to 37.2°C, with cumulonimbus clouds rising in all directions. In the evening, pitch-black thunderclouds appeared in the northern sky, and the Kyoto Sangyo University campus in Kamigamo was hit by a sudden downpour.
The frequent occurrence of linear rainbands has led to an increase in the number of heavy rain warnings issued. However, even in areas where these warnings are issued, it often does not rain much due to the pinpoint nature of these rainbands. This year, concerns are growing about crop failures due to high temperatures, water damage, and drought, as well as decreased immune function due to new infectious diseases and heat.
The Gion Festival in Kyoto (Gion Goryoe) has continued for 1,161 years (excluding the 11 years of the Onin War) because epidemics and natural disasters have never ceased. Six years after the festival began in 863 (Jogan 5), the Jogan Earthquake, with a magnitude exceeding 8.3, struck off the coast of Sanriku in the Tohoku region in 869 (Jogan 11).