20, with the JMA following suit six hours later. After initially moving west, Thad tracked northwest due to the subtropical ridge to its north. Thad slowly deepened, with the JMA upgrading Thad to a severe tropical storm at 06:00 UTC on June 21 and a typhoon the next day. At 06:00 UTC on June 22, the JTWC upped Thad into a typhoon, based on satellite intensity estimates of . Shortly thereafter, the JMA reported that Thad reached its highest intensity, with winds of . Additional strengthening did not occur, however, as the system developed a central cold over – a large irregular shaped area of deep convection. By June 23, Thad reached the western periphery of a subtropical ridge, and began to recurve in response to a mid-latitude trough over eastern China. Rapid weakening began at 00:00 UTC on June 24 due to increased winds aloft. Both the JTWC and JMA downgraded Thad into a tropical storm that day as the storm passed southeast of Okinawa. The JTWC reported that Thad dissipated at 00:00 UTC on June 25, although the JMA continued to track it as a tropical depression for 12 more hours. Severe Tropical Storm Vanessa (Edeng) A tropical disturbance was first spotted at noon on June 24 over east of the Caroline Islands. Thunderstorm activity increased almost immediately thereafter, and the storm's outflow subsequently expanded, aided by a retreating Tropical Upper Tropospheric Trough (TUTT). The JMA upgraded the system into a tropical depression on the morning of June 26. Six hours later, the JTWC followed suit, and at 00:00 UTc on June 27, both the JTWC and JMA upgraded the depression into a tropical storm. Several hours later, Vanessa made landfall over the central Philippines; at the time of landfall, both the JMA and JTWC estimated winds of . Accelerating, Vanessa entered the South China Sea at 02:00 UTC on June 28. Around this time, the JMA estimated that Vanessa reached its maximum intensity, with winds of , making it a severe tropical storm. Strong wind shear then increased over the system, but Vanessa did not begin weakening until 00:00 UTC on June 29. Six hours later, after Vanessa became devoid of deep convection near the center, the JTWC issued their last warning on the system. However, the JMA continued to track it until noon that day. Typhoon Warren (Huaning) A tropical depression formed to the east of