Before revision: 17 April: winds of Typhoon Surigae rapidly intensified by 170 km/h (105 mph) in 36 hours to reach 306 km/h (190 mph), becoming the strongest typhoon, cyclone or hurricane ever observed in February, March, April or May .
After revision: 17 April: winds of Typhoon Surigae rapidly intensified by 170 km/h (105 mph) in 36 hours to reach 306 km/h (190 mph), becoming the strongest tropical cyclone of 2021 worldwide .