Typhoon Songda, known in the Philippines as Typhoon Chedeng, was the strongest tropical cyclone worldwide in 2011, an exceptionally strong and catastrophic typhoon that lashed the eastern coast of the Philippines as a Category 5–equivalent super typhoon and affected the nearby Taiwan and Japan as a weakening tropical cyclone. The fourth tropical depression, second named storm and the first super typhoon of the 2011 Pacific typhoon season, Songda formed from a non-tropical low that was embedded from the Intertropical Convergence Zone on May 17. An area of low-pressure subsequently formed and became organized for the JTWC to issue a TCFA on the system and the JMA to issue advisories, before both agencies declared it a tropical storm, earning the name Songda. Under favorable conditions, Songd