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As we are telling you, Typhoon Hinnamno caused great damage by sprinkling heavy rain on the east coast, especially Pohang and Gyeongju, before it left the inland of Korea.



At dawn, when the rain was concentrated, it rained more than 100 mm per hour, and reporter Seo Dong-gyun of the meteorological team analyzed the cause of this record heavy rain in this area.



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Let's take a look at the route of Typhoon Hinnamno during the night.



After landing in Geoje, Gyeongsangnam-do at around 4:50 a.m., it passed Busan and exited to the sea off Ulsan at 7:10 a.m.



It rained about 100mm per hour in Pohang from about 6 o'clock, an hour before it left the sea off Ulsan.



It rained 81mm per hour in Songdo-dong, Pohang, and 111mm in Guryongpo-eup.



When we looked at how much precipitation was like this, it was the most heavy rain in the history of the Pohang area in terms of hourly rainfall.



If you look at the direction of the wind in the Pohang area at that time, the southeast wind is blowing in the counterclockwise direction the typhoon is blowing.



This southeasterly wind blows from the sea to the land, so it carries a lot of warm water vapor and flows toward Pohang.



However, this air met cold, dry air that came down from the northwest, and when it met in Pohang, long, narrow rain clouds developed explosively.



At that time, the height of the rain cloud reached a whopping 12 km, which is equivalent to the height of the convective sphere where we fly.



It has the characteristic of falling torrential rain in a narrow area like the clouds that poured heavy rain in the Gangnam area of ​​Seoul last month.



In addition, if a typhoon carrying water vapor lands and rubs against the ground, the wind speed will decrease.



In this way, water vapor is immediately formed into rain clouds, which cannot be dissolved and accumulates in a specific area.



This area was Pohang.



This water vapor further developed the above-mentioned rain clouds, which led to an instantaneous torrential rain.



These powerful rain clouds also affected Gyeongju just below Pohang, causing heavy rains of more than 95mm per hour, causing great damage.