Timeline of the 2013 Pacific typhoon season

This timeline documents all of the events of the 2013 Pacific typhoon season. Most of the tropical cyclones forming between May and November. The scope of this article is limited to the Pacific Ocean, north of the equator between 100°E and the International Date Line. Tropical storms that form in the entire Western Pacific basin are assigned a name by the Japan Meteorological Agency. Tropical depressions that form in this basin are given a number with a "W" suffix by the United States' Joint Typhoon Warning Center. In addition, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) assigns names to tropical cyclones (including tropical depressions) that enter or form in the Philippine area of responsibility. These names, however, are not in common use outside of the Philippines.

During the season, 51 systems were designated as Tropical Depressions by either, the Japan Meteorological Agency (JMA), the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), the Joint Typhoon Warning Center (JTWC), or other National Meteorological and Hydrological Services such as the China Meteorological Administration and the Hong Kong Observatory. As they run the Regional Specialized Meteorological Centre for the Western Pacific, the JMA assigns names to Tropical Depressions should they intensify into a tropical storm. PAGASA also assign local names to tropical depressions which form within their area of responsibility; however, these names are not in common use outside of PAGASA’s area of responsibility. In this season, 25 systems entered or formed in the Philippine area of responsibility, which 11 of them directly made landfall over the Philippines.

During the season, October was the most busiest and active month with 9 systems formed or active, 8 were all typhoons and 1 weak storm. 3 storms: Pewa, Unala and 03C entered the Western Pacific basin during August, while during early October and early November, 2 tropical depressions crossed the 100th meridian and one became Cyclone Phailin and this is the first time since Cyclone Jal in 2010. Similar to the month October, in the month of August, 13 storms formed by the JMA. Typhoon Haiyan underwent rapid deepening for nearly 100 millibars, becoming the strongest storm of 2013. In this season, 7 storms underwent rapid deepening. This season has the most amount of tropical depressions formed, tied with 1964.

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