Typhoon Halong, the 11th typhoon of this year, will probably make landfall in Japan rather than Korea, the Korea Meteorological Administration said Tuesday.
It said while Halong's route is still unclear, it seems most likely that it will approach waters off Kyushu on Saturday and move along the Japanese islands.
The typhoon, whose current central pressure is 950hPa and maximum wind speed 43 m/s, weakened a little on Tuesday afternoon but was expected to strengthen again on Wednesday as it passes through warm seas.
As it approaches the Korean Peninsula, the typhoon will likely meet cold air from the north in the upper atmosphere and veer toward Japan, just as typhoon Neoguri did last month, the KMA said.
Korea will then find itself on the left-hand periphery, which is less dangerous than the right, where strong storms occur.
But even if the typhoon changes course, Jeju and the south and the east coasts will be affected by rain storms from Friday to Sunday, a weatherman said.
The west coast and inland regions will not be affected very much but see some sudden showers.
Meanwhile, 5 to 10 mm of rain is forecast to fall in Seoul and central parts on Wednesday due to a trough of low pressure.
Cloudy weather is expected in southern areas on Wednesday with showers in some inland areas in the afternoon and evening.