Typhoon Haishen (2020)

Typhoon Haishen, known in the Philippines as Super Typhoon Kristine, was a powerful tropical cyclone that became the first super typhoon of the 2020 Pacific typhoon season. Haishen, which is also the season's tenth named storm and the fifth typhoon, originated from a disorganized low-pressure area situated near Guam. As the disturbance tracked southwestward and quickly organized, the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert (TCFA) on the system, and a day later, on September 1, the system intensified into a tropical depression. Then, the Japan Meteorological Agency (JMA) upgraded the system to a tropical storm, naming it Haishen as it moved southwestward. At about 12:00 UTC on September 2, the Philippine Atmospheric, Geological and Astronomical Services Administration (PAGASA) indicated that Haishen had entered the Philippine Area of Responsibility (PAR) and assigned the local name Kristine. Later that day, Haishen became a typhoon. On September 3, while drifting northwestward into extremely favorable conditions, Haishen underwent significant intensification, becoming a Category 3-equivalent typhoon and developing a pinhole eye before entering an eyewall replacement cycle (EWRC). Strengthening resumed shortly afterward, and the JTWC estimated peak sustained winds at 155 mph (250 km/h) as the storm reached Category 4 super typhoon status with a new, symmetrical, and clear eye.

Traversing northward toward land while gaining latitude, ocean heat content became unfavorable for supporting such a strong system, and while the central pressure decreased, the system's wind speeds began decreasing, as the structure began degrading. The eye's former shape was no longer present as it appeared ragged on satellite imagery, and Dvorak analysis indicated that Haishen was beginning to weaken steadily. On September 5, Haishen began to lose its eye as its inner eyewall began contracting, and it subsequently weakened to a category 3-equivalent typhoon. On September 6, Haishen made landfall on Japan and South Korea as a strong category 2-equivalent typhoon.

Haishen was the third typhoon within a span of two weeks to make landfall in the Korean Peninsula, the others being Bavi and Maysak.