Typhoon Nalgae, known in the Philippines as Typhoon Quiel, was a powerful tropical cyclone that struck the Philippines, and it affected Hainan, China as a weak tropical storm. Nalgae was the eighth typhoon and the fourth super typhoon in 2011. Forming as the 32nd tropical depression of the season, the system formed on September 26 over the Philippine Sea. On September 27, it was named Nalgae as it explosively intensified into a typhoon on the next day. Nalgae reached its peak intensity as a Category 4 typhoon on September 30 while it made landfall over Luzon. Nalgae weakened into a tropical storm as it entered the South China Sea on October 1. Nalgae made landfall over the island of Guandong in China on October 4 as it weakened to a tropical depression. Nalgae dissipated on October 5 east of Vietnam.

Typhoon Nesat, known in the Philippines as Typhoon Pedring, was the most powerful tropical cyclone to directly impact China since 2005. It also struck the Philippines during the 2011 Pacific typhoon season, killing 98 people. It is the 17th named storm, the 11th severe tropical storm, the 7th typhoon and overall, the 30th tropical cyclone to be monitored by the Japan Meteorological Agency(JMA) during the year. Nesat came exactly two years after Typhoon Ketsana made landfall in the Philippines as the most devastating typhoon in the 2009 Pacific typhoon season with a damage of US$1.09 billion and 747 fatalities. Nesat was also the first of twin tropical cyclones to batter the Philippines within one week during September 2011, the second was Nalgae.