Strong rain clouds from the weakened tropical storm Bobi moved eastward into the East Sea on Wednesday [1].
The shift in weather patterns marks a transition from the storm's direct impact to a secondary rain event, potentially prolonging wet conditions for residents in the interior.
Reporter Kim Min-kyung said the clouds left by Bobi, which had weakened into an extratropical cyclone, have mostly exited into the East Sea [2]. These clouds moved eastward at a speed of 50–60 km per hour [3]. While the primary storm system departed, a new rain-cloud band developed over the West Sea and began moving inland [1].
This new formation occurred as cold air from the northwest collided with warm, moist air from the southwest [1]. The resulting weather system brought continued rainfall to several regions. In Chungnam Buyeo and Gangwon Hwacheon, rainfall intensity was recorded at about 10 mm per hour [1].
Other regions experienced more intense precipitation. Gyeonggi Gapyeong, Yangpyeong, and Gangwon Chuncheon and Hongcheon saw rainfall intensity between 20 and 30 mm per hour [3]. YTN said these strong rain clouds passed through the capital region and are gradually moving toward Gangwon province [4].
Despite the ongoing precipitation, the immediate threat from the tropical storm has diminished. All heavy-rain warnings have been lifted [1].
“The strong rain clouds moved eastward into the East Sea, weakening rain intensity.”
The transition from a tropical storm system to a localized rain-cloud band indicates that while the peak danger of Tropical Storm Bobi has passed, the region remains susceptible to unstable atmospheric conditions. The collision of cold northwestern air and warm southwestern moisture suggests that weather volatility will persist even after official warnings are removed.
