The country will be mostly cloudy on Friday, October 17, though skies over the Seoul metropolitan area and Gangwon Province will gradually clear from nighttime.
Rain will begin along the coasts of Jeju Island and South Jeolla Province in the early morning, spreading to the Chungcheong region and other southern areas between morning and night, and continuing into the following day.
Expected rainfall over the two days through October 18 is 30 to 100 millimeters in Jeju Island (excluding the northern part), with more than 150 millimeters in mountainous areas and more than 120 millimeters in mid-mountain zones. Northern Jeju, Gwangju, South Jeolla and western South Gyeongsang are expected to see 20 to 60 millimeters, while Busan, Ulsan, and central and eastern South Gyeongsang will get 10 to 40 millimeters. North Jeolla is forecast to receive 5 to 30 millimeters, Daegu and southern North Gyeongsang 5 to 20 millimeters, central and northern North Gyeongsang along with Ulleung and Dokdo islands around 5 millimeters, and the Chungcheong region less than 5 millimeters.
Jeju Island may see heavy rain of 20 to 30 millimeters per hour in some areas, requiring extra caution in facility management and safety measures.
Morning lows are forecast at 6 to 14 degrees Celsius, with daytime highs ranging from 17 to 21 degrees. Unlike the previous day, when temperatures climbed into the mid-to-high 20s, readings will return to seasonal norms of 16 to 22 degrees, bringing some relief from the heat.
Fine dust levels will be "good" to "moderate" across all regions.
Waves in coastal waters will reach 0.5 to 2.0 meters in the East Sea and South Sea, and 0.5 to 1.5 meters in the West Sea. In inner offshore waters, within about 200 kilometers of the coastline, waves are expected to reach 0.5 to 2.5 meters in the East and West Seas, and 1.0 to 3.5 meters in the South Sea.
