A low pressure zone is building up on the East Sea since Wednesday and predicted to intensify shortly, according to the national weather bureau.
By 7am Thursday, the low pressure zone was positioned 15.5-16.5 degrees north latitude and 112.5-113.5 degrees east longitude on the East Sea. Within the next 24 hours, it is expected to strengthen and move west northwestwards.
The northern and mid parts of the East Sea will remain rough and experience scattered thunderstorms, as a result of the low pressure zone.
Meanwhile, the northern region is about to face another cold front by Sunday.
The central, central highland and southern regions will see rainfall during the next few days.