On the 4th, thick raindrops fell briefly in Gangneung, Gangwon Province, where a severe drought has put the supply of water for daily use at risk. However, it stopped shortly after, and the daily precipitation was only 2.1 mm. Meanwhile, in Samcheok, also on the eastern coast of Gangwon, a heavy rain warning was issued, with over 100 mm of rain.
According to the Korea Meteorological Administration, Typhoon No. 15, 'Haiphong', developed in the southeastern sea off Kagoshima, Japan, early that morning. Haiphong moved north and shifted its path eastward by entering the westerly wind belt that afternoon. As a result, strong easterly winds were blowing into Korea, bringing rain to the Yeongdong region as it rose along the Taebaek Mountains.
However, even along the same eastern coast, the amount of precipitation varied significantly by region. From midnight to 5 p.m., Gangneung received only 2.1 mm of rain. In Jumunjin, also in Gangneung, it rained 7.0 mm, while Gyeongpo saw 7.5 mm.
The precipitation on this day in the eastern sea, south of Gangneung, also reached only 3.3 mm. The city of Samcheok recorded 8.5 mm. However, in Sanyang-ri, Wondeok-eup, Samcheok, a significant 101.5 mm fell, while Gungchon-ri in Geundeok-myeon received 60 mm. Sokcho, located north of Gangneung, recorded 19.1 mm of rain.
According to the Korea Rural Community Corporation (KRC), the water supply rate of Obong Reservoir, which supplies water for daily use in Gangneung, was 13.4% as of 4:40 p.m. that day. This reflects a drop of 0.4 percentage points from the previous day's rate of 13.8%. The average rate is 71.5%.
Gangneung City plans to implement timed and alternate-day water supply measures if the water supply rate falls below 10%. Starting that day, the city began distributing 2.19 million bottles of bottled water sent from various parts of the country to its citizens.