내일 서울 올해 첫 폭염주의보…내륙지역 곳곳으로 폭염 확대br br The Korea Meteorological Administration says it will issue this year's first heat wave advisory for Seoul tomorrow as unseasonably hot conditions continue to grip the nation. br Parts of Gyeonggi-do Province, as well as some southern regions are already under heat wave advisories.br Weather authorities forecast the mercury to hit a sizzling 35 degrees Celsius tomorrow in some parts - the hottest so far this year.