This timeline documents all the storm formations, strengthening, weakening, landfalls, extratropical transitions, as well as dissipation during the 2008 Pacific typhoon season. The 2008 Pacific typhoon season officially started on January 1, 2008 and ended on January 1, 2009.

The first tropical cyclone of the season formed on January 13. The timeline also includes information which was not operationally released, meaning that information from post-storm reviews by the various warning agencies, such as information on a storm that was not operationally warned on, has been included.

During the year, a total of 40 systems were designated as Tropical Depressions by the Japan Meteorological Agency (JMA), who run the Regional Specialized Meteorological Centre in Tokyo, Japan. The JMA assigns names to Tropical Depressions should they intensify into a tropical storm.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) also assigns local names to tropical depressions which form within their area of responsibility. These names aren’t in common use outside of PAGASA's "Area of Responsibility". The Joint Typhoon Warning Center (JTWC) and other National Meteorological and Hydrological Services also issue warnings for the North-Western Pacific Ocean. The Joint Typhoon Warning Center warnings are referred to numerically to avoid confusion, as the JTWC sometimes recognises a storm at a different intensity compared to the JMA.

For the PAGASA, 21 systems formed or entered in their area during 2008, which 10 of them directly made landfall over the Philippines

Timeline

January January 1 0000 UTC – The 2008 Pacific typhoon season officially starts.

January 13 0600 UTC, (1400 UTC+8) – The JMA reports that a tropical depression has developed about 350 km, (220 mi), to the southwest of Manila in the Philippines. 0600 UTC, (1400 UTC+8) – The JTWC designates the tropical depression as 01W. 0600 UTC, (1400 UTC+8) – The CMA starts to monitor Tropical Depression 01W, as a tropical depression. 1200 UTC, (1400 UTC+8) – The CMA reports that Tropical Depression 01W has reached its two-minute sustained peak windspeeds of 55 km/h, (35 mph).

January 14 0000 UTC, (0800 UTC+8) – The JTWC reports that Tropical Depression 01W has intensified into a tropical storm. 1800 UTC, (0200 UTC+8, January 15) – The JTWC reports that Tropical Storm 01W had weakened into a tropical depression.

January 16 0600 UTC, (1400 UTC+8) – The JTWC reports that Tropical Depression 01W has weakened into a tropical disturbance. 0600 UTC, (1400 UTC+8) – The CMA reports that Tropical Depression 01W has weakened into a tropical disturbance. 1200 UTC, (2000 UTC+8) – The CMA issues its final advisory on Tropical Disturbance 01W.

January 17 1800 UTC, (0200 UTC+8, January 15) – The JTWC reports that Tropical Disturbance 01W has dissipated.

January 18 0000 UTC, (0800 UTC+8) – The JMA issues its final advisory on Tropical Depression 01W.

January 22 1200 UTC, (2000 UTC+8) –The JMA reports that a tropical depression has formed about 830 km, (535 mi), to the southwest of Manila in the Philippines.

January 23 0600 UTC, (1400 UTC+8) – The JMA issues its final advisory on the tropical depression as it weakens into an area of low pressure.

February There were no tropical depressions reported in the Northwestern Pacific during February.

March March 26 1800 UTC, (0200 UTC+8, March 27) – The JMA reports that a tropical depression has formed about 1455 km (900 mi) to the southeast of Manila in the Philippines.

March 27 1200 UTC, (2000 UTC+8) – The JMA issues their final advisory on the tropical depression.

April April 13 0000 UTC, (0800 UTC+8) — The JMA reports that a tropical depression has formed about 1000 km, (620 mi), to the southeast of Manila in the Philippines. 0600 UTC, (1400 UTC+8) – The tropical depression makes landfall on Mindanao Island in the Philippines. 2100 UTC, (0500 UTC+8, April 14) – PAGASA names the tropical depression, Ambo.

April 14 0000 UTC, (0800 UTC+8) — The JTWC designates Tropical Depression Ambo as 02W. 0000 UTC, (0800 UTC+8) — The CMA starts to monitor Tropical Depression 02W, (Ambo), as a tropical depression. 0600 UTC, (1400 UTC+8) — The JTWC reports that Tropical Depression 02W, (Ambo), has intensified into a tropical storm. 1500 UTC, (2300 UTC+8) — Tropical Depression 02W, (Ambo), makes landfall on Palawan Island in the Philippines.

April 15 0600 UTC, (1400 UTC+8) — The JMA reports that Tropical Depression 02W, (Ambo), has intensified into a tropical storm and names it as Neoguri. 0600 UTC, (1400 UTC+8) — The CMA reports that Tropical Depression Neoguri, (02W, Ambo), has intensified into a tropical storm. 1500 UTC, (2300 UTC+8) — PAGASA issues its final advisory on Tropical Storm Neoguri, (02W, Ambo), as the storm leaves its area of responsibility.

April 16 0000 UTC, (0800 UTC+8) — The JMA reports that Tropical Storm Neoguri, (02W, Ambo), has intensified into a severe tropical storm. 0000 UTC, (0800 UTC+8) — The JTWC reports that Tropical Storm Neoguri, (02W, Ambo), has intensified into a category 1 typhoon. 0000 UTC, (0800 UTC+8) — The CMA reports that Tropical Storm Neoguri, (02W, Ambo), has intensified into a severe tropical storm. 0600 UTC, (1400 UTC+8) — The CMA reports that Severe Tropical Storm Neoguri, (02W, Ambo), has intensified into a typhoon. 1200 UTC, (2000 UTC+8) — The JMA reports that Severe Tropical Storm Neoguri, (02W, Ambo), has intensified into a typhoon.

April 17 0000 UTC, (0800 UTC+8) — The CMA reports that Typhoon Neoguri, (02W, Ambo), has reached its peak two-minute sustained wind speeds of 150 km/h (90 mph). 0000 UTC, (0800 UTC+8) — The JTWC reports that Typhoon Neoguri, (02W, Ambo), has intensified into a category two typhoon. 0600 UTC, (1400 UTC+8) — The JMA reports that Typhoon Neoguri, (02W, Ambo), has reached its peak ten-minute sustained wind speeds of 150 km/h (90 mph). 1800 UTC, (0200 UTC+8, April 18) — The JTWC reports that Typhoon Neoguri, (02W, Ambo), has intensified into a category three typhoon. 1800 UTC, (0200 UTC+8, April 18) — The JTWC reports that Typhoon Neoguri, (02W, Ambo), has reached its peak one-minute sustained wind speeds of 185 km/h (115 mph).

April 18 1200 UTC, (2000 UTC+8) — The JTWC reports that Typhoon Neoguri, (02W, Ambo), has weakened into a category two typhoon. 1430 UTC, (2230 UTC+8) — Typhoon Neoguri, (02W, Ambo), makes landfall on Hainan island, China. 1800 UTC, (0200 UTC+8, April 19) — The JTWC reports that Typhoon Neoguri, (02W, Ambo), has weakened into a category one typhoon. 1800 UTC, (0200 UTC+8, April 19) — The CMA reports that Typhoon Neoguri, (02W, Ambo), has weakened into a severe tropical storm.

April 19 0000 UTC, (0800 UTC+8) — The JMA reports that Typhoon Neoguri, (02W, Ambo), has weakened into a severe tropical storm. 0000 UTC, (0800 UTC+8) — The JTWC reports that Typhoon Neoguri, (02W, Ambo), has weakened into a tropical storm. 0000 UTC, (0800 UTC+8) — The CMA reports that Severe Tropical Storm Neoguri, (02W, Ambo), has weakened into a tropical storm. 0615 UTC, (1415 UTC+8) — Tropical Storm Neoguri makes landfall on Guangdong province, in southern China. 0600 UTC, (1400 UTC+8) — The JMA reports that Severe Tropical Storm Neoguri, (02W, Ambo), has weakened into a tropical storm. 1200 UTC, (2000 UTC+8) — The CMA reports that Tropical Storm Neoguri, (02W, Ambo), has weakened into a tropical depression. 1800 UTC, (0200 UTC+8, April 20) — The JTWC issues its final advisory on Tropical Storm Neoguri, (02W, Ambo). 1800 UTC, (0200 UTC+8, April 20) — The JMA reports that Tropical Storm Neoguri, (02W, Ambo), has weakened into a tropical depression. 1800 UTC, (0200 UTC+8, April 20) — The CMA issues its final advisory on Tropical Depression Neoguri, (02W, Ambo).

April 20 0000 UTC, (0800 UTC+8) — The JMA reports that Tropical Depression Neoguri (Ambo) has dissipated.

May May 7 0000 UTC, (0800 UTC+8) – PAGASA reports that Tropical Depression Butchoy has formed about 130 km (80 mi), to the west of Melekeok in Palau. 0000 UTC, (0800 UTC+8) – The JMA starts to monitor Tropical Depression Butchoy as a tropical depression. 0000 UTC, (0800 UTC+8) – The CMA starts to monitor Tropical Depression Butchoy, as a tropical depression. 0600 UTC, (1400 UTC+8) – The JTWC designates Tropical Depression Butchoy as 03W. 1800 UTC, (0200 UTC+8) – The JMA reports that Tropical Depression 03W (Butchoy), has intensified into a tropical storm and names it as Rammasun. 1800 UTC, (0200 UTC+8, May 8) – The JTWC reports that Tropical Depression Rammasun, (03W, Butchoy), has intensified into a tropical storm. 1800 UTC, (0200 UTC+8, May 8) – The CMA reports that Tropical Depression Rammasun, (03W, Butchoy), has intensified into a tropical storm.

May 8 1800 UTC, (0200 UTC+8, May 9) – The JMA reports that Tropical Storm Rammasun, (03W, Butchoy), has intensified into a severe tropical storm. 1800 UTC, (0200 UTC+8, May 9) – The CMA reports that Tropical Storm Rammasun, (03W, Butchoy), has intensified into a severe tropical storm.

May 9 0000 UTC, (0800 UTC+8) – The JTWC reports that Tropical Storm Rammasun, (03W, Butchoy), has intensified into a category 1 typhoon. 0600 UTC, (1400 UTC+8) – The JMA reports that Severe Tropical Storm Rammasun, (03W, Butchoy), has intensified into a typhoon. 0600 UTC, (1400 UTC+8) – The CMA reports that Severe Tropical Storm Rammasun, (03W, Butchoy), has intensified into a typhoon. 1200 UTC, (2000 UTC+8) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has intensified into a category 2 typhoon. 1800 UTC, (0200 UTC+8, May 10) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has intensified into a category three typhoon. 1800 UTC, (0200 UTC+8, May 10) – The CMA reports that Typhoon Rammasun, (03W, Butchoy), has intensified into a severe typhoon.

May 10 0000 UTC, (0800 UTC+8) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has intensified into a category four typhoon. 1200 UTC, (2000 UTC+8) – The JMA reports that Typhoon Rammasun, (03W, Butchoy), has reached its 10-minute sustained peak wind speeds of 195 km/h, (120 mph). 1200 UTC, (2000 UTC+8) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has intensified into a category four super typhoon. 1200 UTC, (2000 UTC+8) – The JTWC reports that Super Typhoon Rammasun, (03W, Butchoy), has reached its one-minute sustained peak wind speeds of 250 km/h, (155 mph). 1200 UTC, (2000 UTC+8) – The CMA reports that Severe Typhoon Rammasun, (03W, Butchoy), has intensified into a super typhoon. 1200 UTC, (2000 UTC+8) – The CMA reports that Super Typhoon Rammasun, (03W, Butchoy), has reached its peak 2-minute sustained windspeeds of 200 km/h,(125 mph).

May 11 0600 UTC, (1400 UTC+8) – The JTWC reports that Super Typhoon Rammasun, (03W, Butchoy), has weakened into a category four typhoon. 0600 UTC, (1400 UTC+8) – The CMA reports that Severe Typhoon Rammasun, (03W, Butchoy), has weakened into a typhoon. 1200 UTC, (2000 UTC+8) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has weakened into a category three typhoon. 1800 UTC, (0200 UTC+8, May 12) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has weakened into a category two typhoon.

May 12 0300 UTC, (1100 UTC+8) – PAGASA reports that Typhoon Rammasun, (03W, Butchoy), has left its area of responsibility and issues its final advisory. 0600 UTC, (1400 UTC+8) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has weakened into a category 1 typhoon. 1200 UTC, (2000 UTC+8) – The JTWC reports that Typhoon Rammasun, (03W, Butchoy), has weakened into an extratropical system. 1200 UTC, (2000 UTC+8) – The CMA reports that Typhoon Rammasun, (03W, Butchoy), has weakened into a severe tropical storm. 1800 UTC, (0200 UTC+8, May 13) – The JMA reports that Typhoon Rammasun, (03W, Butchoy), has weakened into a severe tropical storm.

May 13