On Friday, the 18th, very strong and heavy rain accompanied by squalls, thunder, and lightning is expected nationwide.
This rain is expected to continue until the 19th, with rainfall in Gwangju, Jeollanam-do, and Busan, Ulsan, and Gyeongsangnam-do potentially reaching up to 400 mm.
In addition, the Chungcheong region and Jeollabuk-do are forecasted to receive 100 to 200 mm (with some areas more than 300 mm), Daegu and Gyeongsangbuk-do 80 to 200 mm (with some areas more than 250 mm), Seoul, Incheon, and Gyeonggi-do 50 to 150 mm (with some areas more than 200 mm), while the coastal areas of Jeju Island, excluding inland and northern regions, are expected to get 50 to 100 mm (with some areas more than 150 mm), northern Jeju Island 20 to 80 mm, and the eastern coast of Gangwon-do 10 to 50 mm.
In regions such as southern Gyeonggi-do, Chungcheongnam-do, Chungcheongbuk-do, the southern coast of Jeollanam-do, near Jirisan, Busan, and the southern coast of Gyeongsangnam-do, rain may pour at a rate of 80 mm per hour.
Very strong and heavy rain will fall in narrow areas, leading to significant differences in precipitation and intensity, with some places experiencing fluctuations between heavy and light rain.
The heatwave has been pushed back due to the heavy rain. The lowest temperature on the morning of the 18th is forecasted to be between 22 and 26 degrees Celsius, while the daytime high is expected to be between 27 and 32 degrees Celsius.
The concentration of fine dust is expected to be at 'good' to 'moderate' levels across all regions due to smooth atmospheric dispersion and precipitation.
The sea waves are expected to reach 0.5 to 2.5 meters off the east coast, 0.5 to 3.0 meters off the west coast, and 0.5 to 2.0 meters off the south coast.
Waves in the inner offshore areas (approximately 200 km from the coastline) are expected to be 1.0 to 3.5 meters in the East Sea, 0.5 to 2.5 meters in the West Sea, and 1.0 to 2.5 meters in the South Sea.