While no longer a super typhoon, Haishen was the first in 2020 to reach that status as it started swinging towards Japan and South Korea, and it's still set to have a major impact.
The Joint Typhoon Warning Center (JTWC) defines a super typhoon as one that reaches maximum sustained one-minute surface winds of at least 150 mph (241.4 km/h), which is equivalent to a Category 4 or 5 hurricane on the Saffir-Simpson scale in the Atlantic basin.
On Monday morning (local time), the JTWC reported Haishen's maximum sustained winds were 157 km/h, the equivalent of a low-end Category 2 storm, with gusts up to 194 km/h.
Further weakening is likely after the storm makes landfall Monday morning local time, just west of Busan, South Korea. It will track through the Koreas, crossing into Manchuria and southern Russia within the next 36 hours.
The unfavourable environment, combined with the frictional effects of the rugged mountain ranges of the Korean Peninsula, will rapidly weaken the wind speeds down to 55 kilometres in the next 36 hours.
If, as seems likely, the storm does make landfall on the peninsula, it would break the record for the most landfalling storms in a single season, as reported by The Washington Post.
Haishen looks to deliver record levels of rainfall, triggering severe flooding and mudslides, with the heaviest totals on the eastern side of the Korean Peninsula, with the South Korean capital Seoul spared the worst of the rainfall.
Several regions in South Korea and Japan are still recovering from Typhoon Maysak after it made landfall in South Korea on Thursday. Intense wind gusts and heavy rains resulted in at least two fatalities in the city of Busan.
On Saturday, Japan's coast guard suspended its search, for a second day, for crew missing from a ship that capsized in the East China Sea last week with a cargo of cattle. Rescuers pulled one survivor from the water and recovered one body. The ship's fate is unknown.