Saffir–Simpson hurricane wind scale
Rose intensified further while tracking generally westward at . Around midday on August 13, the typhoon attained a primary peak intensity with winds of 125 mph (205 km/h), equivalent to a Category 3 hurricane on the Saffir–Simpson hurricane wind scale. Rose weakened slightly before making landfall in Palanan, Isabela, Philippines, with winds of 110 mph (175 km/h). The storm weakened further while crossing island of Luzon and emerged into the South China Sea early on August 14 as a minimal typhoon. Rose immediately began to re-intensify. A high-pressure area that had steered the typhoon for the last several days weakened significantly, causing Rose to re-curving northwestward and decelerated to a forward speed of . Deepening continued, with the typhoon peaking with maximum sustained winds of 140 mph (220 km/h) – equal to a Category 4 hurricane on the Saffir–Simpson hurricane wind scale – early on August 16. Later that day, a ship in the vicinity of the eye observed a barometric pressure of – the lowest in relation to the cyclone.