On the evening of September 21, at almost the same time when Nesat was first seen, another low pressure area persisted far south of Hong Kong. The low slowly drifted north and strengthened slowly until on September 24, when the JMA upgraded the system to a tropical depression east of Vietnam. Later that day, the JTWC issued a Tropical Cyclone Formation Alert stating that the low could develop into a tropical cyclone. Early on September 25, the JMA upgraded the system to a tropical storm and named it "Haitang".
On September 26, the Japan Meteorological Agency started to monitor a weak tropical depression. It had developed about to the northwest of Manila in the Philippines. The next day the JTWC issued a tropical cyclone formation alert on the system. However less than 3 hours later, the JTWC designated it as Tropical Depression 22W. JMA reported that the depression had become a tropical storm and named it Nalgae.
The storm slowly drifted to the west. It got stronger slowyl. Nalgae developed a microwave eye like feature and well defined convective banding in all the quadrants. The system had a tiny radius of winds. It was still strengthening significantly and was very well defined. On the evening of September 28, the JMA reported that Nalgae continued to intensify. They upgraded it to a severe tropical storm with winds of over . On that night, the PAGASA began advisories on Nalgae. They gave it the local name "Quiel" as it entered the Philippine Area of Responsibility (PAR). Late on September 29, the JMA upgraded Nalgae to a typhoon. Nalgae quickly intensified on September 30, and became a category 4 super typhoon early on October 1. This was just before making landfall over Luzon. Due to land interaction and colder sea surface temperature in the South China Sea, the JMA downgraded Nalgae to a severe tropical storm on October 2. Then a tropical storm late on October 3. The JTWC downgraded Nalgae to a tropical depression on October 4. The JMA also did it on the next day. Later on October 5, the last low of Nalgae dissipated.
Hitting the Philippines just days after Typhoon Nesat, Nalgae caused further damage across Luzon. It was first feared that Nalgae would cause much more damage to Luzon. But damage from the storm was lighter than Typhoon Nesat. Nearly 2,900 homes were destroyed and about another 15,400 took damage. At least 18 people were killed by the storm and another 7 were reported as missing as of October 11. A total of 1,113,763 people were affected by the storm. Total losses in the country reached just over 115 million PHP (US$2.62 million).
On October 7, the JTWC started monitoring a tropical disturbance about 750 km (465 mi) to the south of Hagåtña, Guam. Over the next couple of days the system gradually developed further while moving towards the west. The JMA reported on October 9, that the disturbance had become a tropical depression. Early on October 10, the JTWC upgraded the system to a tropical depression called "23W". The PAGASA also upgraded it to a tropical depression and named it "Ramon". On October 11, the JMA and the JTWC upgraded the system to a tropical storm and named it "Banyan". Early on October 12, Banyan made landfall over Leyte, Philippines. The JTWC downgraded it to a tropical depression. A half day later, the JMA also downgraded Banyan to a tropical depression. The system dissipated in the South China Sea on October 16.
While going through the Philippines, Banyan had heavy rains across much of the country. This led to widespread flooding. At least ten people were killed by the storm. A total of 75,632 people were affected by the storm.
On December 11, a disturbance formed and stayed near Chuuk. On December 13, the low pressure area quickly got stronger. On the same day, the JTWC upgraded the low pressure to a tropical depression. They named it "27W". The JMA also upgraded it to a tropical depression. The JTWC upgraded the system to a tropical storm on December 14. They then downgraded it to a tropical depression early on December 15. The PAGASA called it "Sendong" as it entered the Philippine Area of Responsibility. After passing Palau on December 15, both the JTWC and the JMA upgraded the system to a tropical storm. They named it "Washi". On December 16, Washi made landfall over Surigao del Sur, a province of the Philippines. Several hours later, Washi arrived at the Sulu Sea and regained its strength quickly. Late on December 17, Washi crossed Palawan, and arrived at the South China Sea. On December 19, Washi weakened into a tropical depression and dissipated.
In the Philippines, Washi caused at least 1,268 deaths. 1,079 people are officially listed as missing. Washi affected 102,899 families or 674,472 people in 766 villages in 52 towns and eight cities in 13 provinces. Most of the deaths were in the cities of Iligan and Cagayan de Oro. Five people were killed in a landslide, but all others died in flash flooding. More than 2,000 have been rescued, according to the Armed Forces of the Philippines. Officials were also investigating reports that an entire village was swept away. The flash flooding happened overnight, following 10 hours of rain. This was made worse by overflowing rivers and tributaries. In some areas, up to 20 centimeters of rain fell in 24 hours. At least 20,000 people were staying in 10 evacuation centers in Cagayan de Oro. Officials said that despite government warning, some people did not evacuate. At least 9,433 houses were destroyed while 18,616 were damaged.
Within the Northwestern Pacific Ocean, there are two separate agencies who assign names to tropical cyclones which often results in a cyclone having two names. The Japan Meteorological Agency names tropical cyclones should they be judged to have 10-minute sustained windspeeds of 65 km/h, (40 mph), to the north of the equator between the 180° and 100°E. Whilst the Philippine Atmospheric, Geophysical and Astronomical Services Administration assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility between 135°E and 115°E and between 5°N-25°N even if the cyclone has had a name assigned to it by the Japan Meteorological Agency.
Tropical Cyclones are named from the following lists by the Regional Specialized Meteorological Centre in Tokyo, Japan, once they reach tropical storm strength. Names are contributed by members of the ESCAP/WMO Typhoon Committee. Each of the 14 nations or territories submitted 10 names, which are used in alphabetical order, by the English name of the country. The next 24 names on the naming list are listed here.
The Philippine Atmospheric, Geophysical and Astronomical Services Administration uses its own naming scheme for tropical cyclones in their area of responsibility. PAGASA assigns names to tropical depressions that form within their area of responsibility and any tropical cyclone that might move into their area of responsibility. Should the list of names for a given year prove to be insufficient, names are taken from an auxiliary list, the first 10 of which are published each year before the season starts.
During their 2012 annual session the ESCAP/WMO Typhoon Committee said that the name Washi would be retired from its naming lists. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said that the names Bebeng, Juaning, Mina, Pedring were retired from PAGASA's list of local names after they each caused over 1 billion PHP in damages to the Philippines during 2011. The name Sendong was also retired from the list after it caused over 300 deaths, when it made landfall on the Philippines during December 2011.