Korea is seeing belated heavy rains after a rather light monsoon season this summer. The Korea Meteorological Administration forecast on Wednesday that rain will continue to drench the entire country on Thursday and Friday.
Thunderstorms hit southern parts until early Thursday morning, moving on to central parts. Torrential rains of more than 30 mm per hour are expected in some areas.
It will stop raining in Jeju around Thursday afternoon and in South Jeolla and South Gyeongsang provinces in the south coast during Thursday night. Rain will continue in Seoul and Chuncheong, North Jeolla and North Gyeongsang provinces until Friday afternoon.
Some 50 to 150 mm of rain is expected in the central region and North Gyeongsang and North Jeolla until Friday, and more than 200 mm in some areas in the south coast.
The late wet season usually follows when the North Pacific anticyclone, which causes hot summer days, recedes from the Korean Peninsula and clashes with a cold air mass from the north.
This year, low atmospheric pressure which develops frequently near Shanghai is moving toward Korea.